95 Grand Cherokee dies

Lektrk · 10-30-2006, 07:21 AM

I have a 95 Grand Cherokee Larado, 4x4, 172,xxx miles. 4.0 inline six, ATD.
When it is cold it runs like a top, after about 10 minutes it starts running rough and eventually dies and won't start until it cools off. It isn't setting any codes.
I've replaced the fuel pump and filter, distributer & cap, rotor, cam sensor.
Running it with a MODUS attatched is shows no problems, fuel pressure is about 40 pounds when it dies, Tried a different coil, made no difference. I replaced the distributer because the old one seemed to start making a lot of noise just before it started running rough and died.

Can anybody help?

crazijoe · 10-30-2006, 07:41 AM

Have you changed the Oxygen sensor?

Lektrk · 10-30-2006, 07:51 AM

No, havent tried that yet, I believe the readings were good for it on the Modus, but I will try that today.

Lektrk · 10-30-2006, 11:03 AM

Changed the O2 sensor, still same problem.

Noticed the catalatic converter was red hot, exhaust has plenty of flow, does not seem clogged at all.

Could it be flooding out?

crazijoe · 10-30-2006, 11:25 AM

Convertor being red hot is either a condition on fuel loading up and collecting in the convertor or engine leaning out causing high temps. Check and see if the exhaust manifold/header is glowing or excessively hot.

Brownievtec · 10-30-2006, 11:39 AM

sounds like a overheating issue,i would check the rad and colant line and so forth

Lektrk · 10-31-2006, 07:22 AM

No glowing pipes, changed the crank sensor, seems to have helped make it at least drivable but still runs a little rough. The RPMs at times bounce from 1800 to 2500+ constantly. Could the new O2 sensor I put in be bad?

daamon_vexion · 11-01-2006, 11:47 AM

could be, did you keep your old one? but it could also be your crank senser you changed

Lektrk · 11-03-2006, 08:11 AM

Replaced the crank sensor again, It runs pretty good now execpt the check engine light comes on after about 5 minutes of driving, stays on until I shut the car off. When I start it again no light for about 5 minutes.

**Fr4665** · 11-03-2006, 08:34 AM

might be the air fuel regulator not sure or some vacum leak

10-30-2006, 07:21 AM	#1 (permalink)
Lektrk Registered User Join Date: Oct 2006 Posts: 8 OS: XP	95 Grand Cherokee dies I have a 95 Grand Cherokee Larado, 4x4, 172,xxx miles. 4.0 inline six, ATD. When it is cold it runs like a top, after about 10 minutes it starts running rough and eventually dies and won't start until it cools off. It isn't setting any codes. I've replaced the fuel pump and filter, distributer & cap, rotor, cam sensor. Running it with a MODUS attatched is shows no problems, fuel pressure is about 40 pounds when it dies, Tried a different coil, made no difference. I replaced the distributer because the old one seemed to start making a lot of noise just before it started running rough and died. Can anybody help? Last edited by Lektrk; 10-30-2006 at 07:25 AM.

10-30-2006, 07:41 AM	#2 (permalink)
crazijoe Registered User Join Date: Oct 2004 Location: Omaha, The Center of the Universe Posts: 7,632 OS: WinXP, Win2K3 My System	Have you changed the Oxygen sensor? __________________ Microsoft MCSA + Messaging, MVP, A+, Network+ http://i16.photobucket.com/albums/b3...other/Help.jpg Do you want a real Republican? HDD diagnostic tools / HDD data recovery software

10-30-2006, 11:25 AM	#5 (permalink)
crazijoe Registered User Join Date: Oct 2004 Location: Omaha, The Center of the Universe Posts: 7,632 OS: WinXP, Win2K3 My System	Convertor being red hot is either a condition on fuel loading up and collecting in the convertor or engine leaning out causing high temps. Check and see if the exhaust manifold/header is glowing or excessively hot. __________________ Microsoft MCSA + Messaging, MVP, A+, Network+ http://i16.photobucket.com/albums/b3...other/Help.jpg Do you want a real Republican? HDD diagnostic tools / HDD data recovery software

11-01-2006, 11:47 AM	#8 (permalink)
daamon_vexion Resident Soldier Join Date: Aug 2006 Location: Iraq (temp) Wyoming Posts: 560 OS: Windows XP Media Center My System	could be, did you keep your old one? but it could also be your crank senser you changed __________________ *And the Infantry Sayeth unto the Lord "Thou hast made us the Queen of battle, and Artillery the King, surely thou knowest what the King does to his Queen?" And the Lord replyeth, "Right On!"*

11-03-2006, 08:34 AM	#10 (permalink)
Fr4665 aka mr.fraggs Join Date: Nov 2004 Location: USA or Germany Posts: 2,965 OS: Win XP,Vista,Android My System	might be the air fuel regulator not sure or some vacum leak __________________ I don't subscribe to threads please PM me if i miss a reply. ------- Everest SensorView Pro DriverCleaner how to fix your game

10-30-2006, 07:51 AM	#3 (permalink)
Lektrk Registered User Join Date: Oct 2006 Posts: 8 OS: XP	No, havent tried that yet, I believe the readings were good for it on the Modus, but I will try that today.

10-30-2006, 11:03 AM	#4 (permalink)
Lektrk Registered User Join Date: Oct 2006 Posts: 8 OS: XP	Changed the O2 sensor, still same problem. Noticed the catalatic converter was red hot, exhaust has plenty of flow, does not seem clogged at all. Could it be flooding out?

10-30-2006, 11:39 AM	#6 (permalink)
Brownievtec Registered User Join Date: Oct 2006 Location: Harrisburg,PA Posts: 10 OS: WIN XP	sounds like a overheating issue,i would check the rad and colant line and so forth

10-31-2006, 07:22 AM	#7 (permalink)
Lektrk Registered User Join Date: Oct 2006 Posts: 8 OS: XP	No glowing pipes, changed the crank sensor, seems to have helped make it at least drivable but still runs a little rough. The RPMs at times bounce from 1800 to 2500+ constantly. Could the new O2 sensor I put in be bad?

11-03-2006, 08:11 AM	#9 (permalink)
Lektrk Registered User Join Date: Oct 2006 Posts: 8 OS: XP	Replaced the crank sensor again, It runs pretty good now execpt the check engine light comes on after about 5 minutes of driving, stays on until I shut the car off. When I start it again no light for about 5 minutes.