bllsht did pass the time by typing:
> I guess anything's possible, but it sure doesn't make much sense that a
> plugged filter would be more evident at idle than on acceleration...
>
> I'm bettin' they haven't found it yet. Sorry. :-)

That was my thought as well, but it is running a lot better now.
They also ran heavy duty decarbonizing/cleaning stuff down the injectors
to clean out carbon buildup. That may well be the cause of my rough idle.
The ZJ was running way rich due to a cracked exhaust header and weak O2
sensor. Oddly though when I had the exhaust header off the valves looked
real clean, only the intake rail had some oil/crud buildup which is your
usual CCV caused buildup.

Even if it didn't fix the stumble it sure brought back some noticeable
power. For right now it idles quite a bit smoother. Not perfect, still
has some vibrations, but no where near what it was doing.

On the bright side they did fix a few buzzes under the hood, a hose
that was rubbing, and spotted an interference between the ABS pump
and my supercharger. That last one I'm afraid is due to a busted
motormount isolator. Jeep only sells the damn things as a whole part
and there are no aftermarket parts. :( Oh well, it's a Jeep thing
and "they" understand.

Gonna have to let the motor cool down and put a prybar on the mounts.
Should be easy to tell and fairly easy to fix. Wonder if I could mill
a new mount out of poly? Or more precisely have the local plastics
shop do it for me. Its only a glorified rubber donut.

> "DougW" wrote:
>
>> Yep. My st00pid idle problem got the better of me so off
>> went the ZJ to a local wrencher (Sooner Auto). Nice people
>> with a lot of experience. They checked the injectors, compression,
>> fremble valves, and all were within spec. Biggest problem was my
>> fuel filter was clogged .....mumble.... I could have checked that
>> myself but since acceleration was fine it just didn't cross the
>> ol brainpan. Heck, I even have a spare in the garage. Must have
>> gotten a tank of crapoline or something is growing in the fuel tank.
>>
>> (not sure, but does a gas tank grow algae like a diesel tank does?)
>>
>> Anyhow, they will run solvent through the rail. The stuff you
>> can't put in a tank cause it will dissolve certain types of plastic.
>> Hope that fixes the problem cause I'm running out of things to do.
>>
>>
>> .... and being _super smart_ today I decided to ride my 10speed
>> back home. Got here and it felt like I had a horse sitting on
>> my chest. :( .getting older sucketh. I seriously need to get
>> more aerobic exercise, lifting weights alone isn't cutting it.
>> Strange thing is I can hike for miles with no problem but the
>> old bike beat the snot out of me.

 

bllsht did pass the time by typing:
> I guess anything's possible, but it sure doesn't make much sense that a
> plugged filter would be more evident at idle than on acceleration...
>
> I'm bettin' they haven't found it yet. Sorry. :-)

That was my thought as well, but it is running a lot better now.
They also ran heavy duty decarbonizing/cleaning stuff down the injectors
to clean out carbon buildup. That may well be the cause of my rough idle.
The ZJ was running way rich due to a cracked exhaust header and weak O2
sensor. Oddly though when I had the exhaust header off the valves looked
real clean, only the intake rail had some oil/crud buildup which is your
usual CCV caused buildup.

Even if it didn't fix the stumble it sure brought back some noticeable
power. For right now it idles quite a bit smoother. Not perfect, still
has some vibrations, but no where near what it was doing.

On the bright side they did fix a few buzzes under the hood, a hose
that was rubbing, and spotted an interference between the ABS pump
and my supercharger. That last one I'm afraid is due to a busted
motormount isolator. Jeep only sells the damn things as a whole part
and there are no aftermarket parts. :( Oh well, it's a Jeep thing
and "they" understand.

Gonna have to let the motor cool down and put a prybar on the mounts.
Should be easy to tell and fairly easy to fix. Wonder if I could mill
a new mount out of poly? Or more precisely have the local plastics
shop do it for me. Its only a glorified rubber donut.

> "DougW" wrote:
>
>> Yep. My st00pid idle problem got the better of me so off
>> went the ZJ to a local wrencher (Sooner Auto). Nice people
>> with a lot of experience. They checked the injectors, compression,
>> fremble valves, and all were within spec. Biggest problem was my
>> fuel filter was clogged .....mumble.... I could have checked that
>> myself but since acceleration was fine it just didn't cross the
>> ol brainpan. Heck, I even have a spare in the garage. Must have
>> gotten a tank of crapoline or something is growing in the fuel tank.
>>
>> (not sure, but does a gas tank grow algae like a diesel tank does?)
>>
>> Anyhow, they will run solvent through the rail. The stuff you
>> can't put in a tank cause it will dissolve certain types of plastic.
>> Hope that fixes the problem cause I'm running out of things to do.
>>
>>
>> .... and being _super smart_ today I decided to ride my 10speed
>> back home. Got here and it felt like I had a horse sitting on
>> my chest. :( .getting older sucketh. I seriously need to get
>> more aerobic exercise, lifting weights alone isn't cutting it.
>> Strange thing is I can hike for miles with no problem but the
>> old bike beat the snot out of me.

 

bllsht did pass the time by typing:
> I guess anything's possible, but it sure doesn't make much sense that a
> plugged filter would be more evident at idle than on acceleration...
>
> I'm bettin' they haven't found it yet. Sorry. :-)

That was my thought as well, but it is running a lot better now.
They also ran heavy duty decarbonizing/cleaning stuff down the injectors
to clean out carbon buildup. That may well be the cause of my rough idle.
The ZJ was running way rich due to a cracked exhaust header and weak O2
sensor. Oddly though when I had the exhaust header off the valves looked
real clean, only the intake rail had some oil/crud buildup which is your
usual CCV caused buildup.

Even if it didn't fix the stumble it sure brought back some noticeable
power. For right now it idles quite a bit smoother. Not perfect, still
has some vibrations, but no where near what it was doing.

On the bright side they did fix a few buzzes under the hood, a hose
that was rubbing, and spotted an interference between the ABS pump
and my supercharger. That last one I'm afraid is due to a busted
motormount isolator. Jeep only sells the damn things as a whole part
and there are no aftermarket parts. :( Oh well, it's a Jeep thing
and "they" understand.

Gonna have to let the motor cool down and put a prybar on the mounts.
Should be easy to tell and fairly easy to fix. Wonder if I could mill
a new mount out of poly? Or more precisely have the local plastics
shop do it for me. Its only a glorified rubber donut.

> "DougW" wrote:
>
>> Yep. My st00pid idle problem got the better of me so off
>> went the ZJ to a local wrencher (Sooner Auto). Nice people
>> with a lot of experience. They checked the injectors, compression,
>> fremble valves, and all were within spec. Biggest problem was my
>> fuel filter was clogged .....mumble.... I could have checked that
>> myself but since acceleration was fine it just didn't cross the
>> ol brainpan. Heck, I even have a spare in the garage. Must have
>> gotten a tank of crapoline or something is growing in the fuel tank.
>>
>> (not sure, but does a gas tank grow algae like a diesel tank does?)
>>
>> Anyhow, they will run solvent through the rail. The stuff you
>> can't put in a tank cause it will dissolve certain types of plastic.
>> Hope that fixes the problem cause I'm running out of things to do.
>>
>>
>> .... and being _super smart_ today I decided to ride my 10speed
>> back home. Got here and it felt like I had a horse sitting on
>> my chest. :( .getting older sucketh. I seriously need to get
>> more aerobic exercise, lifting weights alone isn't cutting it.
>> Strange thing is I can hike for miles with no problem but the
>> old bike beat the snot out of me.

 

Mike Romain did pass the time by typing:
> That happens on my mechanical pump system sometimes just before all heck
> breaks loose. When my rpm come up, so does the pump flow and it will
> push by the blockages.
>
> I suppose the power could drop to the electric pump at low rpm causing
> the same effect maybe?

Dunno.. At boost levels the Kenne Bell boost-a-pump module ups the fuel
pumps voltage and by that the pressure, but that's only when the rail goes
above 2psi. Othewise it should stay stock.

Overall performance had been going down along with fuel milage. First
thought was vac leak, but a few passes with the propane wand didn't find
any leaks.

Checked and cleaned every single connector also. Even checked the sparkplug
wires for crossfire or leaks and the cap for arcing.. Spent so much time under
the hood I figured it was time to let another set of eyeballs look at it.

That and I don't have the equipment to properly clean the injection system.

Guess my next project will be to install some more electronics. A O2 sensor
and electric sending fuel pressure gauge.

--
DougW

 

Mike Romain did pass the time by typing:
> That happens on my mechanical pump system sometimes just before all heck
> breaks loose. When my rpm come up, so does the pump flow and it will
> push by the blockages.
>
> I suppose the power could drop to the electric pump at low rpm causing
> the same effect maybe?

Dunno.. At boost levels the Kenne Bell boost-a-pump module ups the fuel
pumps voltage and by that the pressure, but that's only when the rail goes
above 2psi. Othewise it should stay stock.

Overall performance had been going down along with fuel milage. First
thought was vac leak, but a few passes with the propane wand didn't find
any leaks.

Checked and cleaned every single connector also. Even checked the sparkplug
wires for crossfire or leaks and the cap for arcing.. Spent so much time under
the hood I figured it was time to let another set of eyeballs look at it.

That and I don't have the equipment to properly clean the injection system.

Guess my next project will be to install some more electronics. A O2 sensor
and electric sending fuel pressure gauge.

--
DougW

 

Mike Romain did pass the time by typing:
> That happens on my mechanical pump system sometimes just before all heck
> breaks loose. When my rpm come up, so does the pump flow and it will
> push by the blockages.
>
> I suppose the power could drop to the electric pump at low rpm causing
> the same effect maybe?

Dunno.. At boost levels the Kenne Bell boost-a-pump module ups the fuel
pumps voltage and by that the pressure, but that's only when the rail goes
above 2psi. Othewise it should stay stock.

Overall performance had been going down along with fuel milage. First
thought was vac leak, but a few passes with the propane wand didn't find
any leaks.

Checked and cleaned every single connector also. Even checked the sparkplug
wires for crossfire or leaks and the cap for arcing.. Spent so much time under
the hood I figured it was time to let another set of eyeballs look at it.

That and I don't have the equipment to properly clean the injection system.

Guess my next project will be to install some more electronics. A O2 sensor
and electric sending fuel pressure gauge.

--
DougW

 

Mike Romain did pass the time by typing:
> That happens on my mechanical pump system sometimes just before all heck
> breaks loose. When my rpm come up, so does the pump flow and it will
> push by the blockages.
>
> I suppose the power could drop to the electric pump at low rpm causing
> the same effect maybe?

Dunno.. At boost levels the Kenne Bell boost-a-pump module ups the fuel
pumps voltage and by that the pressure, but that's only when the rail goes
above 2psi. Othewise it should stay stock.

Overall performance had been going down along with fuel milage. First
thought was vac leak, but a few passes with the propane wand didn't find
any leaks.

Checked and cleaned every single connector also. Even checked the sparkplug
wires for crossfire or leaks and the cap for arcing.. Spent so much time under
the hood I figured it was time to let another set of eyeballs look at it.

That and I don't have the equipment to properly clean the injection system.

Guess my next project will be to install some more electronics. A O2 sensor
and electric sending fuel pressure gauge.

--
DougW

 

Well, I would never say never, but it's not really likely. :-)


In message <40CA3A9E.3C90A9A6@sympatico.ca>, "Mike Romain" wrote:

>That happens on my mechanical pump system sometimes just before all heck
>breaks loose. When my rpm come up, so does the pump flow and it will
>push by the blockages.
>
>I suppose the power could drop to the electric pump at low rpm causing
>the same effect maybe?
>
>Mike
>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>88 Cherokee 235 BFG AT's
>
>bllsht wrote:
>>
>> I guess anything's possible, but it sure doesn't make much sense that a plugged
>> filter would be more evident at idle than on acceleration...
>>
>> I'm bettin' they haven't found it yet. Sorry. :-)
>>
>> In message <q1kyc.31566$%T.10067@okepread05>, "DougW" wrote:
>>
>> >Yep. My st00pid idle problem got the better of me so off
>> >went the ZJ to a local wrencher (Sooner Auto). Nice people
>> >with a lot of experience. They checked the injectors, compression,
>> >fremble valves, and all were within spec. Biggest problem was my
>> >fuel filter was clogged .....mumble.... I could have checked that
>> >myself but since acceleration was fine it just didn't cross the
>> >ol brainpan. Heck, I even have a spare in the garage. Must have
>> >gotten a tank of crapoline or something is growing in the fuel tank.
>> >
>> >(not sure, but does a gas tank grow algae like a diesel tank does?)
>> >
>> >Anyhow, they will run solvent through the rail. The stuff you
>> >can't put in a tank cause it will dissolve certain types of plastic.
>> >Hope that fixes the problem cause I'm running out of things to do.
>> >
>> >
>> >.... and being _super smart_ today I decided to ride my 10speed
>> >back home. Got here and it felt like I had a horse sitting on
>> >my chest. :( .getting older sucketh. I seriously need to get
>> >more aerobic exercise, lifting weights alone isn't cutting it.
>> >Strange thing is I can hike for miles with no problem but the
>> >old bike beat the snot out of me.

 

Well, I would never say never, but it's not really likely. :-)


In message <40CA3A9E.3C90A9A6@sympatico.ca>, "Mike Romain" wrote:

>That happens on my mechanical pump system sometimes just before all heck
>breaks loose. When my rpm come up, so does the pump flow and it will
>push by the blockages.
>
>I suppose the power could drop to the electric pump at low rpm causing
>the same effect maybe?
>
>Mike
>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>88 Cherokee 235 BFG AT's
>
>bllsht wrote:
>>
>> I guess anything's possible, but it sure doesn't make much sense that a plugged
>> filter would be more evident at idle than on acceleration...
>>
>> I'm bettin' they haven't found it yet. Sorry. :-)
>>
>> In message <q1kyc.31566$%T.10067@okepread05>, "DougW" wrote:
>>
>> >Yep. My st00pid idle problem got the better of me so off
>> >went the ZJ to a local wrencher (Sooner Auto). Nice people
>> >with a lot of experience. They checked the injectors, compression,
>> >fremble valves, and all were within spec. Biggest problem was my
>> >fuel filter was clogged .....mumble.... I could have checked that
>> >myself but since acceleration was fine it just didn't cross the
>> >ol brainpan. Heck, I even have a spare in the garage. Must have
>> >gotten a tank of crapoline or something is growing in the fuel tank.
>> >
>> >(not sure, but does a gas tank grow algae like a diesel tank does?)
>> >
>> >Anyhow, they will run solvent through the rail. The stuff you
>> >can't put in a tank cause it will dissolve certain types of plastic.
>> >Hope that fixes the problem cause I'm running out of things to do.
>> >
>> >
>> >.... and being _super smart_ today I decided to ride my 10speed
>> >back home. Got here and it felt like I had a horse sitting on
>> >my chest. :( .getting older sucketh. I seriously need to get
>> >more aerobic exercise, lifting weights alone isn't cutting it.
>> >Strange thing is I can hike for miles with no problem but the
>> >old bike beat the snot out of me.

 

Well, I would never say never, but it's not really likely. :-)


In message <40CA3A9E.3C90A9A6@sympatico.ca>, "Mike Romain" wrote:

>That happens on my mechanical pump system sometimes just before all heck
>breaks loose. When my rpm come up, so does the pump flow and it will
>push by the blockages.
>
>I suppose the power could drop to the electric pump at low rpm causing
>the same effect maybe?
>
>Mike
>86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
>88 Cherokee 235 BFG AT's
>
>bllsht wrote:
>>
>> I guess anything's possible, but it sure doesn't make much sense that a plugged
>> filter would be more evident at idle than on acceleration...
>>
>> I'm bettin' they haven't found it yet. Sorry. :-)
>>
>> In message <q1kyc.31566$%T.10067@okepread05>, "DougW" wrote:
>>
>> >Yep. My st00pid idle problem got the better of me so off
>> >went the ZJ to a local wrencher (Sooner Auto). Nice people
>> >with a lot of experience. They checked the injectors, compression,
>> >fremble valves, and all were within spec. Biggest problem was my
>> >fuel filter was clogged .....mumble.... I could have checked that
>> >myself but since acceleration was fine it just didn't cross the
>> >ol brainpan. Heck, I even have a spare in the garage. Must have
>> >gotten a tank of crapoline or something is growing in the fuel tank.
>> >
>> >(not sure, but does a gas tank grow algae like a diesel tank does?)
>> >
>> >Anyhow, they will run solvent through the rail. The stuff you
>> >can't put in a tank cause it will dissolve certain types of plastic.
>> >Hope that fixes the problem cause I'm running out of things to do.
>> >
>> >
>> >.... and being _super smart_ today I decided to ride my 10speed
>> >back home. Got here and it felt like I had a horse sitting on
>> >my chest. :( .getting older sucketh. I seriously need to get
>> >more aerobic exercise, lifting weights alone isn't cutting it.
>> >Strange thing is I can hike for miles with no problem but the
>> >old bike beat the snot out of me.