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Jeep Cherokee Grand Cherokee Engine and Performance Problems

729 messages,  Last post on Mar 20, 2013 at 10:59 AM

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What is this discussion about? Jeep Grand Cherokee, Jeep Grand Cherokee SRT-8, Jeep Cherokee, Engine, SUV

Messages Page 51 of 73

#501 of 729 01 cherokee sport problems by jayjay813

Mar 31, 2009 (6:20 pm)

Where do i begin? i have a 2001 Jeep Cherokee Sport w/ 4.0L 6-cyl automatic, 110,000 miles... I recently had some issues with it overheating due to bad water pump, which blew my head gasket. I had all that fixed, but one problem that started when it was overheating was my oil pressure gauge started reading zero when the engine got hot, but would go back up when i gas it. Even after cooling issues were fixed, gauge problem continues. i'm not leaking or burning any oil that i am aware of, gauge just reads zero when engine is warm and idling.
  
Also, my check engine light is constantly on. error codes are for "evaporative emissions system leak (large)", and occasionally "cylinder 3 misfire". i have had numerous hoses replaced, and replaced my gas cap, but problem persists. also had plugs and o2 sensor replaced at 100,000 miles.
  
AND (oh yes, theres more!) sometimes when i start it it runs really rough. it will idle low and act like its gonna stall, but doesnt. if i try to drive through it, it continues running very rough until i stop and turn it off and back on. usually then, (but not always) it runs fine after restart until the next random time it decides to do it again. happens both on cold start and after sitting for only 10 minutes, but only occasionally, only a few times a month.
  
AND when i start it, theres a knocking sound. nothing too deep or loud, and it usually goes away or is barely audible after warming up. pretty sure its a lifter sticking, but figured id put it on here for a second opinion.
  
and, FINALLY, this is the least of my concerns, but im wondering if this is a common problem. my a/c quit working in 2004 when the prior owner (a family friend) had it. she had the compressor and condenser replaced and it worked for a while after being charged, but eventually stopped again. someone told me that evaporator cores are known to go bad on cherokees, and im wondering if this is the likely culprit.
  
Well, thats where im at at the moment. any info or suggestions at all would be greatly appreciated. For some God awful reason im ridiculously attached to my Jeep and am not ready to let it go!
  
Thanks so much!

#502 of 729 Re: 01 cherokee sport problems [jayjay813] by tidester

Mar 31, 2009 (10:46 pm)

Replying to: jayjay813 (Mar 31, 2009 6:20 pm)
If your engine overheats, it's not unusual for the oil pressure to drop. However, if your engine is overheating and your oil pressure drops, I think you should get it taken care of right away. Your head gasket may be shot again.
 
tidester, host
SUVs and Smart Shopper

#503 of 729 Re: 01 cherokee sport problems [jayjay813] by frumunda

Apr 02, 2009 (3:14 pm)

Replying to: jayjay813 (Mar 31, 2009 6:20 pm)
Not necessarily a head gasket. If the oil pump has crud in the pickup screen(which can happen when coolant gets mixed in the oil or vice versa, the oil galleries can get clogged with goo as well. I would have the cooling and oiling systems flushed and leak tested. Sometimes when the oil pump has a lack of oil in it(caused by the blown head gasket) the pump vanes can wear. Excessive oil pump wear in general can cause this problem as well. My thought is that if it isn't clogged its worn out.

#504 of 729 idles fine but boggs when i hit 3000rpm by illdill

May 13, 2009 (12:59 pm)

i have a 93 grand cherokee, parked it last year for the reason that it powers down and sounds as if it backfires around 3000- 3500 rpm, Ive put alot of work into this vehicle and gave up on it, now change of plan im trying to solve this issue, compression test is fine and i usually rely on check engine light and i solve senser probs with it, i tryed the turn key on and of and no codes show up that seem to solve my problem, good i changed the fuel filter and tested pump ran a lil better after but problem still exists????????????????????// hmmmmm

#505 of 729 Re: Another Jeep noise [pliskin] by illdill

May 14, 2009 (9:42 pm)

Replying to: pliskin (Jan 22, 2007 4:32 pm)
I have a 93 grand and i had a whining noise in the front end fluids were lright and ended up being the differential bearings, i replaced them and put on smaller tire and was good

#506 of 729 Problem with either fuel or electrics? by indianajames

May 15, 2009 (7:24 am)

I have a 1994 Jeep Grand Cherokee and it has a problem with either fuel or electrics.
  
When I start it in the morning the idle fluctuates. When I try to rev the engine the idle drops off completely and sometimes the engine stops. After a few minutes I can gently rev the engine but if I put my foot down too hard and fast then there is a 'popping' from the inlet manifold. If the revs are high then the popping stops and it revs normally until I let it settle to idle. Then when I try and rev it hard again the same thing happens.
  
Once the engine is warm it drives ok but accelerate too hard and it will backfire or 'pop' again.
  
In very hot weather the performance drops off completely and on steep hills or under load the engine will eventually stop. I have to wait until the engine is virtually cold in order for me to re-start. If I remove the MAP sensor, it helps but only for a while.
  
I have changed the coil. I do not know whether this is an electrical fault in one of the sensors, a fuel pressure problem, an ECU problem or a vacuum leak. Please help.

#507 of 729 further to my previous message by indianajames

May 16, 2009 (4:38 am)

I forgot to mention that it is a Jeep Grand Cherokee Limited, 1994, 4 liter 6 cylinder.
 
Can anyone help re the last message and can someone tell me where the EGR is located?
 
Thanks

#508 of 729 Re: Problem with either fuel or electrics? [indianajames] by tidester

May 16, 2009 (11:12 am)

Replying to: indianajames (May 15, 2009 7:24 am)
Are you getting any trouble codes?
 
Be sure to check out the Online Repair Manuals.
 
tidester, host
SUVs and Smart Shopper

#509 of 729 Re: Problem with either fuel or electrics? [tidester] by indianajames

May 16, 2009 (11:31 am)

Replying to: tidester (May 16, 2009 11:12 am)
No codes and no check engine light.

#510 of 729 Re: Problem with either fuel or electrics? [indianajames] by tidester

May 16, 2009 (3:44 pm)

Replying to: indianajames (May 16, 2009 11:31 am)
The EGR should be near the exhaust manifold. Perhaps someone with hands on experience would jump in with specifics. Anyone?
 
tidester, host
SUVs and Smart Shopper

Messages Page 51 of 73

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