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Topic Review (Newest First)
Today 02:01 PM
iwaxmyjimmy
Quote:
Originally Posted by Serg5000 View Post
I used a vacuum gun on every hose.
Ok cool. What was the pressure with the vacuum off of the FPR? Curious now because you know you can get the pressure up, you know the vacuum to the FPR is good, btw how much vacuum does it have? You know the seal is good in the FPR, I wonder if the spring is going bad. Like it's weak now and not giving enough resistance to push past the vacuum. Does that make sense? I can really word stuff to well I'm more of a draw it out to explain it kind if person lol
Today 01:57 PM
Serg5000
Quote:
Originally Posted by iwaxmyjimmy View Post
What did it read when you did that? I'm wondering if there is a small leak in that vacuum line. Because that tell you the seal in the regulator is good. Do you have one of those hand held vacuum testers that you can pull a vacuum on it yourself?
I used a vacuum gun on every hose.
Today 12:52 PM
iwaxmyjimmy
Quote:
Originally Posted by Serg5000 View Post
I certainly did. When I pulled the vacuum line from the reg the pressure shot up instantly. I'm in the middle of cleaning the fuse box. Man was it full of dirt. Next I'm cleaning battery terminals.
What did it read when you did that? I'm wondering if there is a small leak in that vacuum line. Because that tell you the seal in the regulator is good. Do you have one of those hand held vacuum testers that you can pull a vacuum on it yourself?
Today 11:57 AM
Serg5000
Quote:
Originally Posted by iwaxmyjimmy View Post
Possibly the sock on the fuel pump could be mucked up from sitting a while. There are just so many different variables. Have you tired un plugging the vacuum line on the fuel pressure regulator to get the PSI up?
I certainly did. When I pulled the vacuum line from the reg the pressure shot up instantly.

I'm in the middle of cleaning the fuse box. Man was it full of dirt. Next I'm cleaning battery terminals.
Today 11:13 AM
iwaxmyjimmy
Quote:
Originally Posted by Serg5000 View Post
Fuel pressure is no greater than 33-34psi. I tested each and every vacuum line in the diagram that I found for the model year. The PSI reading is what's got me thinking it's the pump.
Possibly the sock on the fuel pump could be mucked up from sitting a while. There are just so many different variables. Have you tired un plugging the vacuum line on the fuel pressure regulator to get the PSI up?
Today 11:10 AM
Ditchdoc
Quote:
Originally Posted by Serg5000 View Post
Fuel pressure is no greater than 33-34psi. I tested each and every vacuum line in the diagram that I found for the model year. The PSI reading is what's got me thinking it's the pump.
Two thing control fuel pressure, well three really. Pump provides flow then a relief valve that is set at 46psi most built into the filter if the filter has 3 connectors not sure what's on the Cherokee and of course the injectors but the injectors can't really cause a major drop in fuel pressure and still have any ability to cause a useable combustion, So that's eliminated.
Today 11:07 AM
Serg5000
Quote:
Originally Posted by otterspop View Post
friend of mine had same issues with his grand cherokee, he was told to blow out fuse block under hood real good, pull the pcm relay out and make sure contacts were clean, cured his problem.
that would be awesome! I was just about to go at taking the fuel pump out when I heard my phone. I will try this suggestion first. Thank you.
Today 10:51 AM
otterspop friend of mine had same issues with his grand cherokee, he was told to blow out fuse block under hood real good, pull the pcm relay out and make sure contacts were clean, cured his problem.
Today 10:50 AM
Serg5000
Quote:
Originally Posted by Ditchdoc View Post
Just reading up on this mystery jeep problem. Pressurized fuel delivery need a minimum of 38 psi anything less than that it won't atomize properly. Your stalling might be happening right before the engine gets to 210 deg. If your fuel pressure is above 38 it should be at 46 at low consumption but no less than 38 under any other circumstance. I would look for a vacuum leak.
Fuel pressure is no greater than 33-34psi.
I tested each and every vacuum line in the diagram that I found for the model year. The PSI reading is what's got me thinking it's the pump.
Today 10:26 AM
Ditchdoc Just reading up on this mystery jeep problem. Pressurized fuel delivery need a minimum of 38 psi anything less than that it won't atomize properly. Your stalling might be happening right before the engine gets to 210 deg. If your fuel pressure is above 38 it should be at 46 at low consumption but no less than 38 under any other circumstance. I would look for a vacuum leak.
Today 10:16 AM
Ditchdoc Howdy folks, taking the jeep in for smog today then to the dmv to transfer the name. Wish me luck I hope the old lady didn't put a lean or some loan on it.
Today 09:54 AM
Smokinjoe
Quote:
Originally Posted by Serg5000 View Post
Coil is new. It was cheap so I got it. The old one was cracked all over. I figure better safe than sorry.
Can I play?.. How about you have some bad or old gas in tank..

sj
Today 09:41 AM
Serg5000
Quote:
Originally Posted by JoeBot13 View Post
I may have missed you saying this, when you checked the electrical did you check the coil? Is there any black smoke from the tail pipe? I've had an O2 sensor go bad and it messed with the air/fuel causing me to run rich and stall. I have also had the battery thing happen to me that Jeff was talking about. On my JK actually, just a couple weeks after the battery warranty ran out. Hard start, rough idle, stalled and gave me an engine code. Have you checked the injectors when you started on the fuel system? I might have missed you saying that also. Whatever it ends up being you'll have to let us know! Good luck.
Coil is new. It was cheap so I got it. The old one was cracked all over. I figure better safe than sorry.
Today 09:38 AM
iwaxmyjimmy
Quote:
Originally Posted by Serg5000 View Post
thanks for the questions. This XJ is a 1992. So no EGR. and yes it sat for a very long time. Maybe a couple years or more. We got it from a friend. It ran great for a few months. Then one day it started acting up. And no smoke coming from the tail pipe. Boy how I wish it would show something other than just stumble and die. Back it around 9:00. I will keep y'all updated.
I'm wondering if the solenoids in the injectors are sticking at times. You can take them out, put some sort of solvent (no brake cleaner) on the fuel rail side then power the injector off a battery and make sure they fire correctly.
Today 09:29 AM
Serg5000
Quote:
Originally Posted by iwaxmyjimmy View Post
Have you checked/cleaned the EGR valve? I know the 4.0 HOs didn't have one from 91-95, so which engine is it? Did the the XJ sit for a long whole, more than a month?
thanks for the questions. This XJ is a 1992. So no EGR. and yes it sat for a very long time. Maybe a couple years or more. We got it from a friend. It ran great for a few months. Then one day it started acting up.

And no smoke coming from the tail pipe. Boy how I wish it would show something other than just stumble and die.

Back it around 9:00. I will keep y'all updated.
Today 01:12 AM
iwaxmyjimmy
Quote:
Originally Posted by Serg5000 View Post
It could be a miss fire. It's a hard one to pin point. The engine will be idling smooth. Then once and a while it will stumble. Sometimes it stumbles to the point it dies. It's an intermediate issue because one minute it's running sweet. The next its dead. And yes I did change the fuel filter about a month or so ago.
Have you checked/cleaned the EGR valve? I know the 4.0 HOs didn't have one from 91-95, so which engine is it? Did the the XJ sit for a long whole, more than a month?
Today 12:36 AM
JoeBot13
Quote:
Originally Posted by Serg5000 View Post
Let me clarify. It stumbles at all RPm ranges. At idle. I can hold the throttle open for a few and it will stumble and die. I was test driving it and I was at a light. It almost died but I slapped it into neutral and saved it. I pulled every vacuum line off one by one and tested each and every one. Everything tested good.
I may have missed you saying this, when you checked the electrical did you check the coil?

Is there any black smoke from the tail pipe? I've had an O2 sensor go bad and it messed with the air/fuel causing me to run rich and stall.

I have also had the battery thing happen to me that Jeff was talking about. On my JK actually, just a couple weeks after the battery warranty ran out. Hard start, rough idle, stalled and gave me an engine code.

Have you checked the injectors when you started on the fuel system? I might have missed you saying that also.

Whatever it ends up being you'll have to let us know! Good luck.
Today 12:35 AM
Serg5000
Quote:
Originally Posted by iwaxmyjimmy View Post
Lol ohhhh hmmm. Is it like cutting out really bad miss firing or more of an intermittent thing? Sorry for the 10000000 questions just trying to help out and maybe think of something you might of over looked. Not saying you haven't checked all the right stuff or anything. You said you put a new fuel filter in it right?
It could be a miss fire.
It's a hard one to pin point. The engine will be idling smooth. Then once and a while it will stumble. Sometimes it stumbles to the point it dies. It's an intermediate issue because one minute it's running sweet. The next its dead.

And yes I did change the fuel filter about a month or so ago.
Today 12:17 AM
iwaxmyjimmy
Quote:
Originally Posted by Serg5000 View Post
Let me clarify. It stumbles at all RPm ranges. At idle. I can hold the throttle open for a few and it will stumble and die. I was test driving it and I was at a light. It almost died but I slapped it into neutral and saved it. I pulled every vacuum line off one by one and tested each and every one. Everything tested good.
Lol ohhhh hmmm. Is it like cutting out really bad miss firing or more of an intermittent thing? Sorry for the 10000000 questions just trying to help out and maybe think of something you might of over looked. Not saying you haven't checked all the right stuff or anything. You said you put a new fuel filter in it right?
Today 12:11 AM
suicideking
Quote:
Originally Posted by Lab Lover View Post
I like when you hear "Other Driver" Lol.....or maybe it's just me that has heard that
You're not alone Lisa.
Today 12:11 AM
Serg5000
Quote:
Originally Posted by iwaxmyjimmy View Post
The fact it's stumbling at idle I wouldn't think it was the fuel pump, if it was higher in the RPM range I could see it because it needs more fuel there. No vacuum leaks or anything?
Let me clarify. It stumbles at all RPm ranges. At idle. I can hold the throttle open for a few and it will stumble and die. I was test driving it and I was at a light. It almost died but I slapped it into neutral and saved it.

I pulled every vacuum line off one by one and tested each and every one. Everything tested good.
Yesterday 11:50 PM
iwaxmyjimmy
Quote:
Originally Posted by Serg5000 View Post
For the most part that's been what's I have been doing. I went to check for spark, I pulled on the wire and it for the metal connecter off. Once I got plugs out they looked a little warn so I got those. I ended up doing wires plugs cap and rotor. It was pretty cheap. I have tested the IAC, MAP, and the fuel regulator. The TPS had a spot when testing it it would show OL. It was supposed to show resistance all the through. The was $29. The throttle body was a little dirty so I pulled it off and cleaned it. Still the issue is there. I'm looking a but further into fuel delivery and fuel pressure. Again. The one thing troubling is the fuel pump. I read it's supposed to stay on for 5 second roughly. It seems to just come on and shut off in about 2 seconds maybe 3. I also jumped out the ballast resistor but that didn't help anything. I guess those were put in to lower the voltage to the fuel pump in order to lower the noise it makes. Anyway. Back at it tomorrow.
The fact it's stumbling at idle I wouldn't think it was the fuel pump, if it was higher in the RPM range I could see it because it needs more fuel there. No vacuum leaks or anything?
Yesterday 11:50 PM
Serg5000 From all the threads I have read. This is a problem that lots of Cherokees have. The bummer is it's always something different that fixes the problem.
Battery. Coil. Fuel pump. Map. IAC. I mean it's never something simple.
Yesterday 11:41 PM
Serg5000
Quote:
Originally Posted by iwaxmyjimmy View Post
Check what you can check and clean what you can clean, try not to replace parts unless you've got solid proof it's a failed part. I would clean the throttle body and also double tap on the IAC. The TPS is a 5volt reference, look up how many volts it should put out at idle and probe the back of the connector with a digital multimeter to make sure it's good.
For the most part that's been what's I have been doing. I went to check for spark, I pulled on the wire and it for the metal connecter off. Once I got plugs out they looked a little warn so I got those. I ended up doing wires plugs cap and rotor. It was pretty cheap. I have tested the IAC, MAP, and the fuel regulator. The TPS had a spot when testing it it would show OL. It was supposed to show resistance all the through. The was $29. The throttle body was a little dirty so I pulled it off and cleaned it.
Still the issue is there. I'm looking a but further into fuel delivery and fuel pressure. Again.

The one thing troubling is the fuel pump. I read it's supposed to stay on for 5 second roughly. It seems to just come on and shut off in about 2 seconds maybe 3. I also jumped out the ballast resistor but that didn't help anything. I guess those were put in to lower the voltage to the fuel pump in order to lower the noise it makes. Anyway. Back at it tomorrow.
Yesterday 11:17 PM
iwaxmyjimmy
Quote:
Originally Posted by Serg5000 View Post
I have not checked the emissions side yet. Also the car does stumble some times when it's just idling on the driveway. I will check the battery tomorrow. The battery is about four months old but I will check it none the less.
Check what you can check and clean what you can clean, try not to replace parts unless you've got solid proof it's a failed part. I would clean the throttle body and also double tap on the IAC. The TPS is a 5volt reference, look up how many volts it should put out at idle and probe the back of the connector with a digital multimeter to make sure it's good.
Yesterday 11:14 PM
Serg5000 I have not checked the emissions side yet.

Also the car does stumble some times when it's just idling on the driveway.

I will check the battery tomorrow. The battery is about four months old but I will check it none the less.
Yesterday 11:08 PM
turdhurdler
Quote:
Originally Posted by Serg5000 View Post
The last two days I have been chasing a ghost that has taken over my daughters 1992 XJ. It started stalling once and a while. When parked and when coming to a stop. No matter what I try I just can't seem to find what's causing the stall. So far I have replaced everything on the ignition side. I did trouble shoot everything first and decided to start replacing old parts. After starting to check the fuel side. The only thing I found was the fuel pressure at the rail. 33 psi. I have read that it's supposed to be around 40+. I'm at a loss for now. Two days of trouble shooting. Tomorrow brings more knuckle busting.
My ex had an XJ with that problem. Turned out to be the battery was on its way out. Not sure why that caused it, but it did. I had replaced the TPS, coil, plugs, wires etc. A friend said to check the battery and that solved the problem. Good luck.

Jeff
Yesterday 11:06 PM
JoeBot13
Quote:
Originally Posted by Serg5000 View Post
The last two days I have been chasing a ghost that has taken over my daughters 1992 XJ. It started stalling once and a while. When parked and when coming to a stop. No matter what I try I just can't seem to find what's causing the stall. So far I have replaced everything on the ignition side. I did trouble shoot everything first and decided to start replacing old parts. After starting to check the fuel side. The only thing I found was the fuel pressure at the rail. 33 psi. I have read that it's supposed to be around 40+. I'm at a loss for now. Two days of trouble shooting. Tomorrow brings more knuckle busting.
Serg have you checked the emissions? Bad O2 sensors or clogged catalytic converter?
Yesterday 11:03 PM
Mad Daddy
Quote:
Originally Posted by WOKNROX View Post
Hey thanx bud...yeah we're having a great time out here...
We have the owner of a Canadian based off road shop camp next to us also...Rock Spyder 4x4 out of Ontario Canada. ...really cool guys...they're giving out all kinds of cool stuff. ..


Good taste in winch
Yesterday 10:51 PM
iwaxmyjimmy
Quote:
Originally Posted by Serg5000 View Post
The last two days I have been chasing a ghost that has taken over my daughters 1992 XJ. It started stalling once and a while. When parked and when coming to a stop. No matter what I try I just can't seem to find what's causing the stall. So far I have replaced everything on the ignition side. I did trouble shoot everything first and decided to start replacing old parts. After starting to check the fuel side. The only thing I found was the fuel pressure at the rail. 33 psi. I have read that it's supposed to be around 40+. I'm at a loss for now. Two days of trouble shooting. Tomorrow brings more knuckle busting.
Does it just stall or does it stumble some times? Any slight misses? Throttle body is all clean mainly the blade and around the edges of it? Idle air control valve maybe needs to be cleaned out?
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