Dieseling
#11
Guest
Posts: n/a
Re: Dieseling
Aloha Mike
Thanks. No A/C and manual transmission. The tag under the hood says 750
for the lowest idle, however, I suspect that the 500 number you
mentioned would might help the dieseling. . I am not sure how well it
will idle at 500, but it idles fine at 750. Easy enough to try for sure.
If you use water instead of ATF, do you still turn off the engine when
it is in? Any particular kind of ATF?
Joe
Mike Romain wrote:
> Do you have AC or an automatic? If so you need the solenoid, otherwise
> it has no function except to get in the way...
>
> The idle should be 500 rpm with the solenoid unplugged and then you set
> the solenoid for the 750 idle. If you have an automatic, it should be
> in drive while adjusting.
>
> Then you could just be carboned up from too many short drives with low
> octane.... Just FYI, the owners manual for the 258 with the BBD states
> high octane might be needed to stop the ping or load rattle if the
> engine is run hard, hot and loaded. The computer uses a knock sensor
> for low octane gas.
>
> You can decarbon the engine. I was taught to use a pint of ATF to do
> this, others swear a pint of water works also. I know first hand that
> the ATF treatment will make the inside of the combustion chamber look
> like new.
>
> I get the engine warmed up and remove the air filter. While keeping the
> rpm up with my hand on the throttle linkage, I slowly pour the ATF down
> the carb keeping it revving enough not to stall. Once the ATF is all
> in, I shut off the engine for a few minutes, then start it up and go.
>
> Warning! This will make a thick white cloud of smoke. Neighbors are
> likely to call the fire dept. if they don't know what's up.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Aug./05 http://www.imagestation.com/album/in...?id=2120343242
> (More Off Road album links at bottom of the view page)
>
> Joe and Joann wrote:
>
>>My 1990 Jeep YJ, 258, has started dieseling after shut off. Does it
>>about one half the time. I think I have the idle and sol-vac solenoid
>>set OK, but maybe not. I tried disconnecting the vacuum and power to
>>the solvac solenoid figuring that maybe the carb was being held open a
>>bit by those, but the problem still occurs. The car does not Ping. Any
>>thoughts.
>>Aloha
>>Joe
>>Maui HI
Thanks. No A/C and manual transmission. The tag under the hood says 750
for the lowest idle, however, I suspect that the 500 number you
mentioned would might help the dieseling. . I am not sure how well it
will idle at 500, but it idles fine at 750. Easy enough to try for sure.
If you use water instead of ATF, do you still turn off the engine when
it is in? Any particular kind of ATF?
Joe
Mike Romain wrote:
> Do you have AC or an automatic? If so you need the solenoid, otherwise
> it has no function except to get in the way...
>
> The idle should be 500 rpm with the solenoid unplugged and then you set
> the solenoid for the 750 idle. If you have an automatic, it should be
> in drive while adjusting.
>
> Then you could just be carboned up from too many short drives with low
> octane.... Just FYI, the owners manual for the 258 with the BBD states
> high octane might be needed to stop the ping or load rattle if the
> engine is run hard, hot and loaded. The computer uses a knock sensor
> for low octane gas.
>
> You can decarbon the engine. I was taught to use a pint of ATF to do
> this, others swear a pint of water works also. I know first hand that
> the ATF treatment will make the inside of the combustion chamber look
> like new.
>
> I get the engine warmed up and remove the air filter. While keeping the
> rpm up with my hand on the throttle linkage, I slowly pour the ATF down
> the carb keeping it revving enough not to stall. Once the ATF is all
> in, I shut off the engine for a few minutes, then start it up and go.
>
> Warning! This will make a thick white cloud of smoke. Neighbors are
> likely to call the fire dept. if they don't know what's up.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Aug./05 http://www.imagestation.com/album/in...?id=2120343242
> (More Off Road album links at bottom of the view page)
>
> Joe and Joann wrote:
>
>>My 1990 Jeep YJ, 258, has started dieseling after shut off. Does it
>>about one half the time. I think I have the idle and sol-vac solenoid
>>set OK, but maybe not. I tried disconnecting the vacuum and power to
>>the solvac solenoid figuring that maybe the carb was being held open a
>>bit by those, but the problem still occurs. The car does not Ping. Any
>>thoughts.
>>Aloha
>>Joe
>>Maui HI
#12
Guest
Posts: n/a
Re: Dieseling
Aloha Mike
Thanks. No A/C and manual transmission. The tag under the hood says 750
for the lowest idle, however, I suspect that the 500 number you
mentioned would might help the dieseling. . I am not sure how well it
will idle at 500, but it idles fine at 750. Easy enough to try for sure.
If you use water instead of ATF, do you still turn off the engine when
it is in? Any particular kind of ATF?
Joe
Mike Romain wrote:
> Do you have AC or an automatic? If so you need the solenoid, otherwise
> it has no function except to get in the way...
>
> The idle should be 500 rpm with the solenoid unplugged and then you set
> the solenoid for the 750 idle. If you have an automatic, it should be
> in drive while adjusting.
>
> Then you could just be carboned up from too many short drives with low
> octane.... Just FYI, the owners manual for the 258 with the BBD states
> high octane might be needed to stop the ping or load rattle if the
> engine is run hard, hot and loaded. The computer uses a knock sensor
> for low octane gas.
>
> You can decarbon the engine. I was taught to use a pint of ATF to do
> this, others swear a pint of water works also. I know first hand that
> the ATF treatment will make the inside of the combustion chamber look
> like new.
>
> I get the engine warmed up and remove the air filter. While keeping the
> rpm up with my hand on the throttle linkage, I slowly pour the ATF down
> the carb keeping it revving enough not to stall. Once the ATF is all
> in, I shut off the engine for a few minutes, then start it up and go.
>
> Warning! This will make a thick white cloud of smoke. Neighbors are
> likely to call the fire dept. if they don't know what's up.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Aug./05 http://www.imagestation.com/album/in...?id=2120343242
> (More Off Road album links at bottom of the view page)
>
> Joe and Joann wrote:
>
>>My 1990 Jeep YJ, 258, has started dieseling after shut off. Does it
>>about one half the time. I think I have the idle and sol-vac solenoid
>>set OK, but maybe not. I tried disconnecting the vacuum and power to
>>the solvac solenoid figuring that maybe the carb was being held open a
>>bit by those, but the problem still occurs. The car does not Ping. Any
>>thoughts.
>>Aloha
>>Joe
>>Maui HI
Thanks. No A/C and manual transmission. The tag under the hood says 750
for the lowest idle, however, I suspect that the 500 number you
mentioned would might help the dieseling. . I am not sure how well it
will idle at 500, but it idles fine at 750. Easy enough to try for sure.
If you use water instead of ATF, do you still turn off the engine when
it is in? Any particular kind of ATF?
Joe
Mike Romain wrote:
> Do you have AC or an automatic? If so you need the solenoid, otherwise
> it has no function except to get in the way...
>
> The idle should be 500 rpm with the solenoid unplugged and then you set
> the solenoid for the 750 idle. If you have an automatic, it should be
> in drive while adjusting.
>
> Then you could just be carboned up from too many short drives with low
> octane.... Just FYI, the owners manual for the 258 with the BBD states
> high octane might be needed to stop the ping or load rattle if the
> engine is run hard, hot and loaded. The computer uses a knock sensor
> for low octane gas.
>
> You can decarbon the engine. I was taught to use a pint of ATF to do
> this, others swear a pint of water works also. I know first hand that
> the ATF treatment will make the inside of the combustion chamber look
> like new.
>
> I get the engine warmed up and remove the air filter. While keeping the
> rpm up with my hand on the throttle linkage, I slowly pour the ATF down
> the carb keeping it revving enough not to stall. Once the ATF is all
> in, I shut off the engine for a few minutes, then start it up and go.
>
> Warning! This will make a thick white cloud of smoke. Neighbors are
> likely to call the fire dept. if they don't know what's up.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Aug./05 http://www.imagestation.com/album/in...?id=2120343242
> (More Off Road album links at bottom of the view page)
>
> Joe and Joann wrote:
>
>>My 1990 Jeep YJ, 258, has started dieseling after shut off. Does it
>>about one half the time. I think I have the idle and sol-vac solenoid
>>set OK, but maybe not. I tried disconnecting the vacuum and power to
>>the solvac solenoid figuring that maybe the carb was being held open a
>>bit by those, but the problem still occurs. The car does not Ping. Any
>>thoughts.
>>Aloha
>>Joe
>>Maui HI
#13
Guest
Posts: n/a
Re: Dieseling
Aloha Mike
Thanks. No A/C and manual transmission. The tag under the hood says 750
for the lowest idle, however, I suspect that the 500 number you
mentioned would might help the dieseling. . I am not sure how well it
will idle at 500, but it idles fine at 750. Easy enough to try for sure.
If you use water instead of ATF, do you still turn off the engine when
it is in? Any particular kind of ATF?
Joe
Mike Romain wrote:
> Do you have AC or an automatic? If so you need the solenoid, otherwise
> it has no function except to get in the way...
>
> The idle should be 500 rpm with the solenoid unplugged and then you set
> the solenoid for the 750 idle. If you have an automatic, it should be
> in drive while adjusting.
>
> Then you could just be carboned up from too many short drives with low
> octane.... Just FYI, the owners manual for the 258 with the BBD states
> high octane might be needed to stop the ping or load rattle if the
> engine is run hard, hot and loaded. The computer uses a knock sensor
> for low octane gas.
>
> You can decarbon the engine. I was taught to use a pint of ATF to do
> this, others swear a pint of water works also. I know first hand that
> the ATF treatment will make the inside of the combustion chamber look
> like new.
>
> I get the engine warmed up and remove the air filter. While keeping the
> rpm up with my hand on the throttle linkage, I slowly pour the ATF down
> the carb keeping it revving enough not to stall. Once the ATF is all
> in, I shut off the engine for a few minutes, then start it up and go.
>
> Warning! This will make a thick white cloud of smoke. Neighbors are
> likely to call the fire dept. if they don't know what's up.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Aug./05 http://www.imagestation.com/album/in...?id=2120343242
> (More Off Road album links at bottom of the view page)
>
> Joe and Joann wrote:
>
>>My 1990 Jeep YJ, 258, has started dieseling after shut off. Does it
>>about one half the time. I think I have the idle and sol-vac solenoid
>>set OK, but maybe not. I tried disconnecting the vacuum and power to
>>the solvac solenoid figuring that maybe the carb was being held open a
>>bit by those, but the problem still occurs. The car does not Ping. Any
>>thoughts.
>>Aloha
>>Joe
>>Maui HI
Thanks. No A/C and manual transmission. The tag under the hood says 750
for the lowest idle, however, I suspect that the 500 number you
mentioned would might help the dieseling. . I am not sure how well it
will idle at 500, but it idles fine at 750. Easy enough to try for sure.
If you use water instead of ATF, do you still turn off the engine when
it is in? Any particular kind of ATF?
Joe
Mike Romain wrote:
> Do you have AC or an automatic? If so you need the solenoid, otherwise
> it has no function except to get in the way...
>
> The idle should be 500 rpm with the solenoid unplugged and then you set
> the solenoid for the 750 idle. If you have an automatic, it should be
> in drive while adjusting.
>
> Then you could just be carboned up from too many short drives with low
> octane.... Just FYI, the owners manual for the 258 with the BBD states
> high octane might be needed to stop the ping or load rattle if the
> engine is run hard, hot and loaded. The computer uses a knock sensor
> for low octane gas.
>
> You can decarbon the engine. I was taught to use a pint of ATF to do
> this, others swear a pint of water works also. I know first hand that
> the ATF treatment will make the inside of the combustion chamber look
> like new.
>
> I get the engine warmed up and remove the air filter. While keeping the
> rpm up with my hand on the throttle linkage, I slowly pour the ATF down
> the carb keeping it revving enough not to stall. Once the ATF is all
> in, I shut off the engine for a few minutes, then start it up and go.
>
> Warning! This will make a thick white cloud of smoke. Neighbors are
> likely to call the fire dept. if they don't know what's up.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Aug./05 http://www.imagestation.com/album/in...?id=2120343242
> (More Off Road album links at bottom of the view page)
>
> Joe and Joann wrote:
>
>>My 1990 Jeep YJ, 258, has started dieseling after shut off. Does it
>>about one half the time. I think I have the idle and sol-vac solenoid
>>set OK, but maybe not. I tried disconnecting the vacuum and power to
>>the solvac solenoid figuring that maybe the carb was being held open a
>>bit by those, but the problem still occurs. The car does not Ping. Any
>>thoughts.
>>Aloha
>>Joe
>>Maui HI
#14
Guest
Posts: n/a
Re: Dieseling
The 500 idle is for when there is no power or vacuum to the solenoid.
When running, the solenoid holds the idle up.
The idle solenoid is there to jump the idle up when you put it in drive
or when you turn on the AC. It has no other function. Some folks put a
switch on the power to it and unhook the vacuum. They then use it as a
switched fast idle.
Any type of ATF works, I always seem to have Dexron around. I would
also shut it off after a water pour. It shocks the carbon, so the cool
down might be part of it.
Mike
Joe and Joann wrote:
>
> Aloha Mike
> Thanks. No A/C and manual transmission. The tag under the hood says 750
> for the lowest idle, however, I suspect that the 500 number you
> mentioned would might help the dieseling. . I am not sure how well it
> will idle at 500, but it idles fine at 750. Easy enough to try for sure.
>
> If you use water instead of ATF, do you still turn off the engine when
> it is in? Any particular kind of ATF?
> Joe
>
> Mike Romain wrote:
> > Do you have AC or an automatic? If so you need the solenoid, otherwise
> > it has no function except to get in the way...
> >
> > The idle should be 500 rpm with the solenoid unplugged and then you set
> > the solenoid for the 750 idle. If you have an automatic, it should be
> > in drive while adjusting.
> >
> > Then you could just be carboned up from too many short drives with low
> > octane.... Just FYI, the owners manual for the 258 with the BBD states
> > high octane might be needed to stop the ping or load rattle if the
> > engine is run hard, hot and loaded. The computer uses a knock sensor
> > for low octane gas.
> >
> > You can decarbon the engine. I was taught to use a pint of ATF to do
> > this, others swear a pint of water works also. I know first hand that
> > the ATF treatment will make the inside of the combustion chamber look
> > like new.
> >
> > I get the engine warmed up and remove the air filter. While keeping the
> > rpm up with my hand on the throttle linkage, I slowly pour the ATF down
> > the carb keeping it revving enough not to stall. Once the ATF is all
> > in, I shut off the engine for a few minutes, then start it up and go.
> >
> > Warning! This will make a thick white cloud of smoke. Neighbors are
> > likely to call the fire dept. if they don't know what's up.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> > Canadian Off Road Trips Photos: Non members can still view!
> > Aug./05 http://www.imagestation.com/album/in...?id=2120343242
> > (More Off Road album links at bottom of the view page)
> >
> > Joe and Joann wrote:
> >
> >>My 1990 Jeep YJ, 258, has started dieseling after shut off. Does it
> >>about one half the time. I think I have the idle and sol-vac solenoid
> >>set OK, but maybe not. I tried disconnecting the vacuum and power to
> >>the solvac solenoid figuring that maybe the carb was being held open a
> >>bit by those, but the problem still occurs. The car does not Ping. Any
> >>thoughts.
> >>Aloha
> >>Joe
> >>Maui HI
When running, the solenoid holds the idle up.
The idle solenoid is there to jump the idle up when you put it in drive
or when you turn on the AC. It has no other function. Some folks put a
switch on the power to it and unhook the vacuum. They then use it as a
switched fast idle.
Any type of ATF works, I always seem to have Dexron around. I would
also shut it off after a water pour. It shocks the carbon, so the cool
down might be part of it.
Mike
Joe and Joann wrote:
>
> Aloha Mike
> Thanks. No A/C and manual transmission. The tag under the hood says 750
> for the lowest idle, however, I suspect that the 500 number you
> mentioned would might help the dieseling. . I am not sure how well it
> will idle at 500, but it idles fine at 750. Easy enough to try for sure.
>
> If you use water instead of ATF, do you still turn off the engine when
> it is in? Any particular kind of ATF?
> Joe
>
> Mike Romain wrote:
> > Do you have AC or an automatic? If so you need the solenoid, otherwise
> > it has no function except to get in the way...
> >
> > The idle should be 500 rpm with the solenoid unplugged and then you set
> > the solenoid for the 750 idle. If you have an automatic, it should be
> > in drive while adjusting.
> >
> > Then you could just be carboned up from too many short drives with low
> > octane.... Just FYI, the owners manual for the 258 with the BBD states
> > high octane might be needed to stop the ping or load rattle if the
> > engine is run hard, hot and loaded. The computer uses a knock sensor
> > for low octane gas.
> >
> > You can decarbon the engine. I was taught to use a pint of ATF to do
> > this, others swear a pint of water works also. I know first hand that
> > the ATF treatment will make the inside of the combustion chamber look
> > like new.
> >
> > I get the engine warmed up and remove the air filter. While keeping the
> > rpm up with my hand on the throttle linkage, I slowly pour the ATF down
> > the carb keeping it revving enough not to stall. Once the ATF is all
> > in, I shut off the engine for a few minutes, then start it up and go.
> >
> > Warning! This will make a thick white cloud of smoke. Neighbors are
> > likely to call the fire dept. if they don't know what's up.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> > Canadian Off Road Trips Photos: Non members can still view!
> > Aug./05 http://www.imagestation.com/album/in...?id=2120343242
> > (More Off Road album links at bottom of the view page)
> >
> > Joe and Joann wrote:
> >
> >>My 1990 Jeep YJ, 258, has started dieseling after shut off. Does it
> >>about one half the time. I think I have the idle and sol-vac solenoid
> >>set OK, but maybe not. I tried disconnecting the vacuum and power to
> >>the solvac solenoid figuring that maybe the carb was being held open a
> >>bit by those, but the problem still occurs. The car does not Ping. Any
> >>thoughts.
> >>Aloha
> >>Joe
> >>Maui HI
#15
Guest
Posts: n/a
Re: Dieseling
The 500 idle is for when there is no power or vacuum to the solenoid.
When running, the solenoid holds the idle up.
The idle solenoid is there to jump the idle up when you put it in drive
or when you turn on the AC. It has no other function. Some folks put a
switch on the power to it and unhook the vacuum. They then use it as a
switched fast idle.
Any type of ATF works, I always seem to have Dexron around. I would
also shut it off after a water pour. It shocks the carbon, so the cool
down might be part of it.
Mike
Joe and Joann wrote:
>
> Aloha Mike
> Thanks. No A/C and manual transmission. The tag under the hood says 750
> for the lowest idle, however, I suspect that the 500 number you
> mentioned would might help the dieseling. . I am not sure how well it
> will idle at 500, but it idles fine at 750. Easy enough to try for sure.
>
> If you use water instead of ATF, do you still turn off the engine when
> it is in? Any particular kind of ATF?
> Joe
>
> Mike Romain wrote:
> > Do you have AC or an automatic? If so you need the solenoid, otherwise
> > it has no function except to get in the way...
> >
> > The idle should be 500 rpm with the solenoid unplugged and then you set
> > the solenoid for the 750 idle. If you have an automatic, it should be
> > in drive while adjusting.
> >
> > Then you could just be carboned up from too many short drives with low
> > octane.... Just FYI, the owners manual for the 258 with the BBD states
> > high octane might be needed to stop the ping or load rattle if the
> > engine is run hard, hot and loaded. The computer uses a knock sensor
> > for low octane gas.
> >
> > You can decarbon the engine. I was taught to use a pint of ATF to do
> > this, others swear a pint of water works also. I know first hand that
> > the ATF treatment will make the inside of the combustion chamber look
> > like new.
> >
> > I get the engine warmed up and remove the air filter. While keeping the
> > rpm up with my hand on the throttle linkage, I slowly pour the ATF down
> > the carb keeping it revving enough not to stall. Once the ATF is all
> > in, I shut off the engine for a few minutes, then start it up and go.
> >
> > Warning! This will make a thick white cloud of smoke. Neighbors are
> > likely to call the fire dept. if they don't know what's up.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> > Canadian Off Road Trips Photos: Non members can still view!
> > Aug./05 http://www.imagestation.com/album/in...?id=2120343242
> > (More Off Road album links at bottom of the view page)
> >
> > Joe and Joann wrote:
> >
> >>My 1990 Jeep YJ, 258, has started dieseling after shut off. Does it
> >>about one half the time. I think I have the idle and sol-vac solenoid
> >>set OK, but maybe not. I tried disconnecting the vacuum and power to
> >>the solvac solenoid figuring that maybe the carb was being held open a
> >>bit by those, but the problem still occurs. The car does not Ping. Any
> >>thoughts.
> >>Aloha
> >>Joe
> >>Maui HI
When running, the solenoid holds the idle up.
The idle solenoid is there to jump the idle up when you put it in drive
or when you turn on the AC. It has no other function. Some folks put a
switch on the power to it and unhook the vacuum. They then use it as a
switched fast idle.
Any type of ATF works, I always seem to have Dexron around. I would
also shut it off after a water pour. It shocks the carbon, so the cool
down might be part of it.
Mike
Joe and Joann wrote:
>
> Aloha Mike
> Thanks. No A/C and manual transmission. The tag under the hood says 750
> for the lowest idle, however, I suspect that the 500 number you
> mentioned would might help the dieseling. . I am not sure how well it
> will idle at 500, but it idles fine at 750. Easy enough to try for sure.
>
> If you use water instead of ATF, do you still turn off the engine when
> it is in? Any particular kind of ATF?
> Joe
>
> Mike Romain wrote:
> > Do you have AC or an automatic? If so you need the solenoid, otherwise
> > it has no function except to get in the way...
> >
> > The idle should be 500 rpm with the solenoid unplugged and then you set
> > the solenoid for the 750 idle. If you have an automatic, it should be
> > in drive while adjusting.
> >
> > Then you could just be carboned up from too many short drives with low
> > octane.... Just FYI, the owners manual for the 258 with the BBD states
> > high octane might be needed to stop the ping or load rattle if the
> > engine is run hard, hot and loaded. The computer uses a knock sensor
> > for low octane gas.
> >
> > You can decarbon the engine. I was taught to use a pint of ATF to do
> > this, others swear a pint of water works also. I know first hand that
> > the ATF treatment will make the inside of the combustion chamber look
> > like new.
> >
> > I get the engine warmed up and remove the air filter. While keeping the
> > rpm up with my hand on the throttle linkage, I slowly pour the ATF down
> > the carb keeping it revving enough not to stall. Once the ATF is all
> > in, I shut off the engine for a few minutes, then start it up and go.
> >
> > Warning! This will make a thick white cloud of smoke. Neighbors are
> > likely to call the fire dept. if they don't know what's up.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> > Canadian Off Road Trips Photos: Non members can still view!
> > Aug./05 http://www.imagestation.com/album/in...?id=2120343242
> > (More Off Road album links at bottom of the view page)
> >
> > Joe and Joann wrote:
> >
> >>My 1990 Jeep YJ, 258, has started dieseling after shut off. Does it
> >>about one half the time. I think I have the idle and sol-vac solenoid
> >>set OK, but maybe not. I tried disconnecting the vacuum and power to
> >>the solvac solenoid figuring that maybe the carb was being held open a
> >>bit by those, but the problem still occurs. The car does not Ping. Any
> >>thoughts.
> >>Aloha
> >>Joe
> >>Maui HI
#16
Guest
Posts: n/a
Re: Dieseling
The 500 idle is for when there is no power or vacuum to the solenoid.
When running, the solenoid holds the idle up.
The idle solenoid is there to jump the idle up when you put it in drive
or when you turn on the AC. It has no other function. Some folks put a
switch on the power to it and unhook the vacuum. They then use it as a
switched fast idle.
Any type of ATF works, I always seem to have Dexron around. I would
also shut it off after a water pour. It shocks the carbon, so the cool
down might be part of it.
Mike
Joe and Joann wrote:
>
> Aloha Mike
> Thanks. No A/C and manual transmission. The tag under the hood says 750
> for the lowest idle, however, I suspect that the 500 number you
> mentioned would might help the dieseling. . I am not sure how well it
> will idle at 500, but it idles fine at 750. Easy enough to try for sure.
>
> If you use water instead of ATF, do you still turn off the engine when
> it is in? Any particular kind of ATF?
> Joe
>
> Mike Romain wrote:
> > Do you have AC or an automatic? If so you need the solenoid, otherwise
> > it has no function except to get in the way...
> >
> > The idle should be 500 rpm with the solenoid unplugged and then you set
> > the solenoid for the 750 idle. If you have an automatic, it should be
> > in drive while adjusting.
> >
> > Then you could just be carboned up from too many short drives with low
> > octane.... Just FYI, the owners manual for the 258 with the BBD states
> > high octane might be needed to stop the ping or load rattle if the
> > engine is run hard, hot and loaded. The computer uses a knock sensor
> > for low octane gas.
> >
> > You can decarbon the engine. I was taught to use a pint of ATF to do
> > this, others swear a pint of water works also. I know first hand that
> > the ATF treatment will make the inside of the combustion chamber look
> > like new.
> >
> > I get the engine warmed up and remove the air filter. While keeping the
> > rpm up with my hand on the throttle linkage, I slowly pour the ATF down
> > the carb keeping it revving enough not to stall. Once the ATF is all
> > in, I shut off the engine for a few minutes, then start it up and go.
> >
> > Warning! This will make a thick white cloud of smoke. Neighbors are
> > likely to call the fire dept. if they don't know what's up.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> > Canadian Off Road Trips Photos: Non members can still view!
> > Aug./05 http://www.imagestation.com/album/in...?id=2120343242
> > (More Off Road album links at bottom of the view page)
> >
> > Joe and Joann wrote:
> >
> >>My 1990 Jeep YJ, 258, has started dieseling after shut off. Does it
> >>about one half the time. I think I have the idle and sol-vac solenoid
> >>set OK, but maybe not. I tried disconnecting the vacuum and power to
> >>the solvac solenoid figuring that maybe the carb was being held open a
> >>bit by those, but the problem still occurs. The car does not Ping. Any
> >>thoughts.
> >>Aloha
> >>Joe
> >>Maui HI
When running, the solenoid holds the idle up.
The idle solenoid is there to jump the idle up when you put it in drive
or when you turn on the AC. It has no other function. Some folks put a
switch on the power to it and unhook the vacuum. They then use it as a
switched fast idle.
Any type of ATF works, I always seem to have Dexron around. I would
also shut it off after a water pour. It shocks the carbon, so the cool
down might be part of it.
Mike
Joe and Joann wrote:
>
> Aloha Mike
> Thanks. No A/C and manual transmission. The tag under the hood says 750
> for the lowest idle, however, I suspect that the 500 number you
> mentioned would might help the dieseling. . I am not sure how well it
> will idle at 500, but it idles fine at 750. Easy enough to try for sure.
>
> If you use water instead of ATF, do you still turn off the engine when
> it is in? Any particular kind of ATF?
> Joe
>
> Mike Romain wrote:
> > Do you have AC or an automatic? If so you need the solenoid, otherwise
> > it has no function except to get in the way...
> >
> > The idle should be 500 rpm with the solenoid unplugged and then you set
> > the solenoid for the 750 idle. If you have an automatic, it should be
> > in drive while adjusting.
> >
> > Then you could just be carboned up from too many short drives with low
> > octane.... Just FYI, the owners manual for the 258 with the BBD states
> > high octane might be needed to stop the ping or load rattle if the
> > engine is run hard, hot and loaded. The computer uses a knock sensor
> > for low octane gas.
> >
> > You can decarbon the engine. I was taught to use a pint of ATF to do
> > this, others swear a pint of water works also. I know first hand that
> > the ATF treatment will make the inside of the combustion chamber look
> > like new.
> >
> > I get the engine warmed up and remove the air filter. While keeping the
> > rpm up with my hand on the throttle linkage, I slowly pour the ATF down
> > the carb keeping it revving enough not to stall. Once the ATF is all
> > in, I shut off the engine for a few minutes, then start it up and go.
> >
> > Warning! This will make a thick white cloud of smoke. Neighbors are
> > likely to call the fire dept. if they don't know what's up.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> > Canadian Off Road Trips Photos: Non members can still view!
> > Aug./05 http://www.imagestation.com/album/in...?id=2120343242
> > (More Off Road album links at bottom of the view page)
> >
> > Joe and Joann wrote:
> >
> >>My 1990 Jeep YJ, 258, has started dieseling after shut off. Does it
> >>about one half the time. I think I have the idle and sol-vac solenoid
> >>set OK, but maybe not. I tried disconnecting the vacuum and power to
> >>the solvac solenoid figuring that maybe the carb was being held open a
> >>bit by those, but the problem still occurs. The car does not Ping. Any
> >>thoughts.
> >>Aloha
> >>Joe
> >>Maui HI