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Jeep Cherokee Grand Cherokee Engine and Performance Problems

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

You are in the Jeep Cherokee and Jeep Grand Cherokee Forum.

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

Messages Page 48 of 74

#463 of 729 2001 JGC Laredo High Pitched Noise when letting off gas pedal by agallman

Jan 06, 2009 (2:21 pm)

I have a 2001 Grand Cherokee Laredo and started hearing a very high-pitched sound that occurs when I decel (let off the gas) at speeds above 15 mph. When I press the gas pedal and accelerate, it disappears. It also disappears when I slow down below 20 mph or when sitting idle. It's not metal against metal (such as rotors/brakes) or anything like that. Sounds like a really 10x steam kettle (almost like some type of pressure leak). The sound is louder and more prevalent when engine is cold. Sometimes disappears after driving a while, but other times it doesn't. The check engine light is also on. Took it to Jeep service twice, both times they say the computer is returning and invalid code. However when I took it to Autozone, they had a code that was related to emissions sensor.
Any suggestions?

#464 of 729 Re: 1993 Grand Cherokee will not start [jeepfamily] by jeepfamily

Jan 11, 2009 (1:19 am)

Replying to: jeepfamily (Jan 02, 2009 4:29 pm)
Took the Jeep to my mechanic, ends up being an intermittent faulty Fuel Pump, started 3 out of 5 times, after doing an entire tune-up. The Fuel Pump is in the Fuel Tank, typical lol , the fuel pump costs $ 374.00 (module actually), Oh well, it's running great now

#465 of 729 High Oil Pressure and Temp reading by khaldrogo

Jan 19, 2009 (12:11 pm)

I hope you can help me out..I was driving home and the first thing I noticed was that the heat coming out of my vents went cold and seconds later my gages were chirping at me. I pulled off the highway and noticed that both my oil pressure and temp gage were red. I popped the hood and noticed that the coolant was released by the pressure relief valve but that was it. I checked the fan belt - no problem. I waited for a while and then started it back up and went as far as I could until the temp gage came close to the red zone (the oil gage stayed high). I did this several times until I got home. The only other thing I noticed was the engine wouldn't start right away - I had to feather the gas pedal.

#466 of 729 Re: 1993 Grand Cherokee will not start [jeepfamily] by Kirksjohnson

Jan 20, 2009 (7:34 pm)

Replying to: jeepfamily (Jan 02, 2009 4:29 pm)
If you have good spark then the crank sensor is working. Are you checking for spark at the coil or the plug wires. Do you have good fuel pressure? Can you hear the fuel injectors chattering. Can you hear the fuel pump kick on when you turn the key to the on position or when it is cranking over?

#467 of 729 Re: Intermitten loss of power [helixman] by jeepmike1

Jan 21, 2009 (12:51 pm)

Replying to: helixman (Aug 26, 2008 7:20 pm)
Hi,
Your problem sounds very like the one I have with my Jeep a 98/99 Cherokee with all the same suspicions as to symptoms. I have confirmed that it is not fuel pump, regulator or filter by hooking up a pressure gauge inside the car to the fuel rail. It stays at 50 psi when I get the problem. I also confirmed that it is not O2 sensor as this is operating within the expected voltage range. I am not sure whee to go next.
 
Did you resolve your issue and if so what was the solution???
 
Thanks
 
Mike

#468 of 729 Re: press request [kirstie_h] by xmech

Jan 23, 2009 (6:50 pm)

Replying to: Kirstie@Edmunds (Oct 27, 2008 12:24 pm)
LOL! Sorry to throw this in here, but I've been lurking many other threads at Edmunds searching for a good mid-size sedan to replace my 2000 Grand Cherokee. One day I decided to see what's up in the Edmunds GC forums, and couldn't believe all the problems listed here!
 
I've had 2 door lock actuators go bad, a siezed rear brake caliper, both rear axle seals leak(NEVER off-road), the interior lights mysteriously fade on and off with the alarm set, my water pump goes out October every 2 years, a transmission leak which will probably cost more than the car is worth to fix, and now my oil pressure gauge pegs at max pressure with the engine off...
 
So I found it kind of humorous that they are looking for some 'satisfied' GC drivers. I guess other than the issues, I like my GC other than the MPG, nowadays. I'm sure there are satisfied owners out there, it was just funny to find that comment amongst all the problems.

#469 of 729 Re: press request [xmech] by tidester

Jan 23, 2009 (9:24 pm)

Replying to: xmech (Jan 23, 2009 6:50 pm)
they are looking for some 'satisfied' GC drivers ... it was just funny to find that comment amongst all the problems
 
One might conclude that's what would make it newsworthy!
 
tidester, host
SUVs and Smart Shopper

#470 of 729 Re: High Oil Pressure and Temp reading [khaldrogo] by khaldrogo

Jan 25, 2009 (1:23 pm)

Replying to: khaldrogo (Jan 19, 2009 12:11 pm)
-additional info for #465...
 
I replaced the water pump and it appears that the temp is under control but my oil pressure is still extremely high. I took it for a test ride and it stalled out after about 3 minutes. Right before it stalled I was having to feather the gas to keep the engine running.

#471 of 729 Re: High Oil Pressure and Temp reading [khaldrogo] by xmech

Jan 25, 2009 (3:46 pm)

Replying to: khaldrogo (Jan 19, 2009 12:11 pm)
Does your oil pressure show high with the engine off but the ignition switch on? Might just be a bad sending unit and nothing to do with it running bad.

#472 of 729 Re: High Oil Pressure and Temp reading [xmech] by khaldrogo

Jan 26, 2009 (9:16 am)

Replying to: xmech (Jan 25, 2009 3:46 pm)
I just checked - with the key in the ignition, the oil reads just above 40, after I start it up it goes up to 70. Early this morning, I let the jeep run in my garage for a while. When I first started it the it up, the engine would rev properly when I step on the gas pedal but after 5 minutes it would bog down when I stepped on the gas and then shoot up....any help?
 
I was checking out some other web sites that discussed reasons why the vehicle would stall. A majority of the issues looked to be a bad crank shaft position sensor...

Messages Page 48 of 74

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