Re: 1986 Jeep Grand Wagoneer
 

jimmy3stix@comcast.net wrote:
> Recently driving back from NH my car backfired twice (travelling about
> 70mph) and then died. I pulled off road and whan I restarted it it
> back fired so loud it blew the muffler. Service guy said it was a
> fuel problem as it was blowing un spent fuel out the exhaust. I did a
> carb rebuild and it starts fine and runs for about ten seconds and
> dies, again with the same fuel problem. Seems to be flooded. Any one
> have any ideas. I have heard everything from fuel pump to timing to
> ignition module and various other causes. Not sure if I should
> purchase a new carb or if it something else, perhaps the catalytic
> converter.
>
> Thanks for any help.
>
> Jim
>

I think spark. The fuel is there for sure.

Even if something like the float stuck, it wouldn't matter above 50 mph.

Was it raining? Maybe a splash of water got the distributor cap and
cracked it.

You can do a base check for the timing chain having jumped by putting it
on the timing mark on the crank and seeing if the rotor is pointing real
close to # 1 under the distributor cap. It should be 'just' after
center on the pin.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's - Gone to the rust pile...
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Re: 1986 Jeep Grand Wagoneer
 

jimmy3stix wrote:
> On Jul 6, 11:58 am, "DougW" wrote:
>> jimmy3stix wrote:
>>> Recently driving back from NH my car backfired twice (travelling
>>> about 70mph) and then died. I pulled off road and whan I restarted
>>> it it back fired so loud it blew the muffler. Service guy said it
>>> was a fuel problem as it was blowing un spent fuel out the exhaust.
>>> I did a carb rebuild and it starts fine and runs for about ten
>>> seconds and dies, again with the same fuel problem. Seems to be
>>> flooded. Any one have any ideas. I have heard everything from
>>> fuel pump to timing to ignition module and various other causes.
>>> Not sure if I should purchase a new carb or if it something else,
>>> perhaps the catalytic converter.
>>
>> 1986 doesn't have that much that can go wrong. I'd suspect a cracked
>> sparkplug, bad wire, or cracked cap/rotor that's preventing one of
>> the cylinders from getting spark. That gas is pushed out and
>> subsequently lit by the cat.
>>
>> I've had sparkplugs that looked good but arced internally. Also had
>> a few that fell apart when they were removed. Go get some good
>> Autolite plugs.

> I'll give it a shot thanks. I do get a large amount of gas vapors
> coming out of the carb tho when the air cleaner is off. Would faulty
> spark plugs cause a flooding condition because it will run for about
> ten seconds and then quit. It will start again if I let it sit for an
> hour or so, but the same symptoms appear.

A faulty ignition will allow raw fuel into the muffler/cat and cause some
nice loud backfires.

Smelling gas out the carb is a different matter. My only experience
is with the Rochester 4M4 Quadrajet (Chevy 305 carb) I had a sticking
float that was dumping gas into the engine. The floats can also get
old and start to soak up fuel, then they don't exert enough pressure
to keep the needle valve shut.

I like the FAQ on this site.
http://www.recarbco.com/technical/newtrouble.html

--
DougW

Re: 1986 Jeep Grand Wagoneer
 

jimmy3stix wrote:
> On Jul 6, 11:58 am, "DougW" wrote:
>> jimmy3stix wrote:
>>> Recently driving back from NH my car backfired twice (travelling
>>> about 70mph) and then died. I pulled off road and whan I restarted
>>> it it back fired so loud it blew the muffler. Service guy said it
>>> was a fuel problem as it was blowing un spent fuel out the exhaust.
>>> I did a carb rebuild and it starts fine and runs for about ten
>>> seconds and dies, again with the same fuel problem. Seems to be
>>> flooded. Any one have any ideas. I have heard everything from
>>> fuel pump to timing to ignition module and various other causes.
>>> Not sure if I should purchase a new carb or if it something else,
>>> perhaps the catalytic converter.
>>
>> 1986 doesn't have that much that can go wrong. I'd suspect a cracked
>> sparkplug, bad wire, or cracked cap/rotor that's preventing one of
>> the cylinders from getting spark. That gas is pushed out and
>> subsequently lit by the cat.
>>
>> I've had sparkplugs that looked good but arced internally. Also had
>> a few that fell apart when they were removed. Go get some good
>> Autolite plugs.

> I'll give it a shot thanks. I do get a large amount of gas vapors
> coming out of the carb tho when the air cleaner is off. Would faulty
> spark plugs cause a flooding condition because it will run for about
> ten seconds and then quit. It will start again if I let it sit for an
> hour or so, but the same symptoms appear.

A faulty ignition will allow raw fuel into the muffler/cat and cause some
nice loud backfires.

Smelling gas out the carb is a different matter. My only experience
is with the Rochester 4M4 Quadrajet (Chevy 305 carb) I had a sticking
float that was dumping gas into the engine. The floats can also get
old and start to soak up fuel, then they don't exert enough pressure
to keep the needle valve shut.

I like the FAQ on this site.
http://www.recarbco.com/technical/newtrouble.html

--
DougW

Re: 1986 Jeep Grand Wagoneer
 

jimmy3stix wrote:
> On Jul 6, 11:58 am, "DougW" wrote:
>> jimmy3stix wrote:
>>> Recently driving back from NH my car backfired twice (travelling
>>> about 70mph) and then died. I pulled off road and whan I restarted
>>> it it back fired so loud it blew the muffler. Service guy said it
>>> was a fuel problem as it was blowing un spent fuel out the exhaust.
>>> I did a carb rebuild and it starts fine and runs for about ten
>>> seconds and dies, again with the same fuel problem. Seems to be
>>> flooded. Any one have any ideas. I have heard everything from
>>> fuel pump to timing to ignition module and various other causes.
>>> Not sure if I should purchase a new carb or if it something else,
>>> perhaps the catalytic converter.
>>
>> 1986 doesn't have that much that can go wrong. I'd suspect a cracked
>> sparkplug, bad wire, or cracked cap/rotor that's preventing one of
>> the cylinders from getting spark. That gas is pushed out and
>> subsequently lit by the cat.
>>
>> I've had sparkplugs that looked good but arced internally. Also had
>> a few that fell apart when they were removed. Go get some good
>> Autolite plugs.

> I'll give it a shot thanks. I do get a large amount of gas vapors
> coming out of the carb tho when the air cleaner is off. Would faulty
> spark plugs cause a flooding condition because it will run for about
> ten seconds and then quit. It will start again if I let it sit for an
> hour or so, but the same symptoms appear.

A faulty ignition will allow raw fuel into the muffler/cat and cause some
nice loud backfires.

Smelling gas out the carb is a different matter. My only experience
is with the Rochester 4M4 Quadrajet (Chevy 305 carb) I had a sticking
float that was dumping gas into the engine. The floats can also get
old and start to soak up fuel, then they don't exert enough pressure
to keep the needle valve shut.

I like the FAQ on this site.
http://www.recarbco.com/technical/newtrouble.html

--
DougW

Re: 1986 Jeep Grand Wagoneer
 

jimmy3stix wrote:
> On Jul 6, 11:58 am, "DougW" wrote:
>> jimmy3stix wrote:
>>> Recently driving back from NH my car backfired twice (travelling
>>> about 70mph) and then died. I pulled off road and whan I restarted
>>> it it back fired so loud it blew the muffler. Service guy said it
>>> was a fuel problem as it was blowing un spent fuel out the exhaust.
>>> I did a carb rebuild and it starts fine and runs for about ten
>>> seconds and dies, again with the same fuel problem. Seems to be
>>> flooded. Any one have any ideas. I have heard everything from
>>> fuel pump to timing to ignition module and various other causes.
>>> Not sure if I should purchase a new carb or if it something else,
>>> perhaps the catalytic converter.
>>
>> 1986 doesn't have that much that can go wrong. I'd suspect a cracked
>> sparkplug, bad wire, or cracked cap/rotor that's preventing one of
>> the cylinders from getting spark. That gas is pushed out and
>> subsequently lit by the cat.
>>
>> I've had sparkplugs that looked good but arced internally. Also had
>> a few that fell apart when they were removed. Go get some good
>> Autolite plugs.

> I'll give it a shot thanks. I do get a large amount of gas vapors
> coming out of the carb tho when the air cleaner is off. Would faulty
> spark plugs cause a flooding condition because it will run for about
> ten seconds and then quit. It will start again if I let it sit for an
> hour or so, but the same symptoms appear.

A faulty ignition will allow raw fuel into the muffler/cat and cause some
nice loud backfires.

Smelling gas out the carb is a different matter. My only experience
is with the Rochester 4M4 Quadrajet (Chevy 305 carb) I had a sticking
float that was dumping gas into the engine. The floats can also get
old and start to soak up fuel, then they don't exert enough pressure
to keep the needle valve shut.

I like the FAQ on this site.
http://www.recarbco.com/technical/newtrouble.html

--
DougW

Re: 1986 Jeep Grand Wagoneer
 

On Jul 6, 12:13 pm, Mike Romain <roma...@sympatico.ca> wrote:
> jimmy3s...@comcast.net wrote:
> > Recently driving back from NH my car backfired twice (travelling about
> > 70mph) and then died. I pulled off road and whan I restarted it it
> > back fired so loud it blew the muffler. Service guy said it was a
> > fuel problem as it was blowing un spent fuel out the exhaust. I did a
> > carb rebuild and it starts fine and runs for about ten seconds and
> > dies, again with the same fuel problem. Seems to be flooded. Any one
> > have any ideas. I have heard everything from fuel pump to timing to
> > ignition module and various other causes. Not sure if I should
> > purchase a new carb or if it something else, perhaps the catalytic
> > converter.
>
> > Thanks for any help.
>
> > Jim
>
> I think spark. The fuel is there for sure.
>
> Even if something like the float stuck, it wouldn't matter above 50 mph.
>
> Was it raining? Maybe a splash of water got the distributor cap and
> cracked it.
>
> You can do a base check for the timing chain having jumped by putting it
> on the timing mark on the crank and seeing if the rotor is pointing real
> close to # 1 under the distributor cap. It should be 'just' after
> center on the pin.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590
> (More Off Road album links at bottom of the view page)- Hide quoted text -
>
> - Show quoted text -

No rain, dry as a bone. I will check timing and spark conditions.
Maybe I should replace the float as I did not do that with the
rebuild, althoughyou said it should not matter at the rate of speed i
was travelling.

Thanks to all for your help. I guess I know how I will be spending
tomorrow.

Jim

Re: 1986 Jeep Grand Wagoneer
 

On Jul 6, 12:13 pm, Mike Romain <roma...@sympatico.ca> wrote:
> jimmy3s...@comcast.net wrote:
> > Recently driving back from NH my car backfired twice (travelling about
> > 70mph) and then died. I pulled off road and whan I restarted it it
> > back fired so loud it blew the muffler. Service guy said it was a
> > fuel problem as it was blowing un spent fuel out the exhaust. I did a
> > carb rebuild and it starts fine and runs for about ten seconds and
> > dies, again with the same fuel problem. Seems to be flooded. Any one
> > have any ideas. I have heard everything from fuel pump to timing to
> > ignition module and various other causes. Not sure if I should
> > purchase a new carb or if it something else, perhaps the catalytic
> > converter.
>
> > Thanks for any help.
>
> > Jim
>
> I think spark. The fuel is there for sure.
>
> Even if something like the float stuck, it wouldn't matter above 50 mph.
>
> Was it raining? Maybe a splash of water got the distributor cap and
> cracked it.
>
> You can do a base check for the timing chain having jumped by putting it
> on the timing mark on the crank and seeing if the rotor is pointing real
> close to # 1 under the distributor cap. It should be 'just' after
> center on the pin.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590
> (More Off Road album links at bottom of the view page)- Hide quoted text -
>
> - Show quoted text -

No rain, dry as a bone. I will check timing and spark conditions.
Maybe I should replace the float as I did not do that with the
rebuild, althoughyou said it should not matter at the rate of speed i
was travelling.

Thanks to all for your help. I guess I know how I will be spending
tomorrow.

Jim

Re: 1986 Jeep Grand Wagoneer
 

On Jul 6, 12:13 pm, Mike Romain <roma...@sympatico.ca> wrote:
> jimmy3s...@comcast.net wrote:
> > Recently driving back from NH my car backfired twice (travelling about
> > 70mph) and then died. I pulled off road and whan I restarted it it
> > back fired so loud it blew the muffler. Service guy said it was a
> > fuel problem as it was blowing un spent fuel out the exhaust. I did a
> > carb rebuild and it starts fine and runs for about ten seconds and
> > dies, again with the same fuel problem. Seems to be flooded. Any one
> > have any ideas. I have heard everything from fuel pump to timing to
> > ignition module and various other causes. Not sure if I should
> > purchase a new carb or if it something else, perhaps the catalytic
> > converter.
>
> > Thanks for any help.
>
> > Jim
>
> I think spark. The fuel is there for sure.
>
> Even if something like the float stuck, it wouldn't matter above 50 mph.
>
> Was it raining? Maybe a splash of water got the distributor cap and
> cracked it.
>
> You can do a base check for the timing chain having jumped by putting it
> on the timing mark on the crank and seeing if the rotor is pointing real
> close to # 1 under the distributor cap. It should be 'just' after
> center on the pin.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590
> (More Off Road album links at bottom of the view page)- Hide quoted text -
>
> - Show quoted text -

No rain, dry as a bone. I will check timing and spark conditions.
Maybe I should replace the float as I did not do that with the
rebuild, althoughyou said it should not matter at the rate of speed i
was travelling.

Thanks to all for your help. I guess I know how I will be spending
tomorrow.

Jim

Re: 1986 Jeep Grand Wagoneer
 

On Jul 6, 12:13 pm, Mike Romain <roma...@sympatico.ca> wrote:
> jimmy3s...@comcast.net wrote:
> > Recently driving back from NH my car backfired twice (travelling about
> > 70mph) and then died. I pulled off road and whan I restarted it it
> > back fired so loud it blew the muffler. Service guy said it was a
> > fuel problem as it was blowing un spent fuel out the exhaust. I did a
> > carb rebuild and it starts fine and runs for about ten seconds and
> > dies, again with the same fuel problem. Seems to be flooded. Any one
> > have any ideas. I have heard everything from fuel pump to timing to
> > ignition module and various other causes. Not sure if I should
> > purchase a new carb or if it something else, perhaps the catalytic
> > converter.
>
> > Thanks for any help.
>
> > Jim
>
> I think spark. The fuel is there for sure.
>
> Even if something like the float stuck, it wouldn't matter above 50 mph.
>
> Was it raining? Maybe a splash of water got the distributor cap and
> cracked it.
>
> You can do a base check for the timing chain having jumped by putting it
> on the timing mark on the crank and seeing if the rotor is pointing real
> close to # 1 under the distributor cap. It should be 'just' after
> center on the pin.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's - Gone to the rust pile...
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06http://www.imagestation.com/album/pictures.html?id=2115147590
> (More Off Road album links at bottom of the view page)- Hide quoted text -
>
> - Show quoted text -

No rain, dry as a bone. I will check timing and spark conditions.
Maybe I should replace the float as I did not do that with the
rebuild, althoughyou said it should not matter at the rate of speed i
was travelling.

Thanks to all for your help. I guess I know how I will be spending
tomorrow.

Jim

Re: Re: 1986 Jeep Grand Wagoneer
 

On Fri, 06 Jul 2007 09:04:28 -0700, jimmy3stix@comcast.net wrote:

>On Jul 6, 11:54 am, "Earle Horton" <el_anglo_burg...@usa.com> wrote:
>> The first thing to check is the ignition system, because components are
>> cheap and easy to replace or inspect. Plug wires can do this. You would
>> feel silly working on a carburetor all day, and then finding out you had a
>> cracked distributor cap.
>>
>> Which engine do you have?
>>
>> Saludos cordiales,
>>
>> Earle
>>
>> <jimmy3s...@comcast.net> wrote in message
>>
>> news:1183736977.741464.193660@g4g2000hsf.googlegro ups.com...
>>
>> > Recently driving back from NH my car backfired twice (travelling about
>> > 70mph) and then died. I pulled off road and whan I restarted it it
>> > back fired so loud it blew the muffler. Service guy said it was a
>> > fuel problem as it was blowing un spent fuel out the exhaust. I did a
>> > carb rebuild and it starts fine and runs for about ten seconds and
>> > dies, again with the same fuel problem. Seems to be flooded. Any one
>> > have any ideas. I have heard everything from fuel pump to timing to
>> > ignition module and various other causes. Not sure if I should
>> > purchase a new carb or if it something else, perhaps the catalytic
>> > converter.
>>
>> > Thanks for any help.
>>
>> > Jim
>>
>> --
>> Posted via a free Usenet account fromhttp://www.teranews.com
>
>Engine is 4.9L V8. Wires, plugs and distributer cap replaced about
>3000 miles ago. Car was running fine up until that point, however I
>had just refueled 30 miles previous after letting fuel run too low
>(gauge is tempermental). Thought I may have picked up a vapor lock
>along the way. I will pull the plugs tonight though and look for any
>tell tale signs.


The first thing to figure out here is if it is leaning out or
flooding. Lean mixtures tend to backfire on that engine which BTW is a
5.9 AMC V8 not a 4.9. I tend to suspect the fuel pump here and it
should be easy to figure out if it is flooding out because there will
be a lot of gas pouring in when it dies out. If it is leaning out and
dying there will not even be any fuel for accelerator pump if you pump
it a few times because bowl will be dry. (it will squirt first time
but not much after that) This is not a ignition wire or plug problem.
If fuel system checks out the next thing would be the ignition control
module. BTW I have owned a AMC 360 for 22 years and counting and I
know that engine well.
-----------------
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