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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 34 of 73

#331 of 729 The most annoying noise in the world!!!! by eagle18411

Jan 03, 2008 (8:59 am)

I have a 2001 Jeep Grand Cherokee Limited (4.7) with 75000 miles on it. Anytime I accelerate over 10 miles an hour a high pitch squeak strats. Multiple letting the air o0ut of a balloon slowly by ten and thats what it sounds like. Sounds alot like a belt but it only does it over 10mph and all the belts are good. I took the tire and brakes off lifted it up and ran it off the ground. The noise was still there. I got close enough to narrow the noise down to the front axle on the passenger side. I have had no mechanically problems with this vehicle at all. Any suggestions what this could be?

#332 of 729 2004 GRAND CHEROKEE P205 CODE by brian69

Jan 03, 2008 (11:18 pm)

MY 2204 GRAND CHEROKEE MISSES AT AN EXTENDED IDLE OR ALMOST ALWAYS WHEN PUT INTO REVERSE CODE READER SAYS INJ. CIRCUIT # 5 HAS A PROBLEM REPLACED INJECTOR AND SPARK PLUGS STILL CONTINUES TO MISS AT TIMES.

#333 of 729 GAS MILEAGE by 99limited

Jan 13, 2008 (12:37 pm)

I'am sure most of you have heard this before. I have a 1999 Grand Cherokee V-8 that has plenty of power but rotten gas mileage. With the cost of gas I'am willing to sacrifice some power to get better fuel economy. Has any one had any success with any of the chips that are available and does a non restrictive air filter help

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

Jan 14, 2008 (12:19 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 10-15 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.
Any suggestions?

#335 of 729 We don't know where to turn! by fedup11

Jan 21, 2008 (1:36 pm)

I have been checking out this forum and can find several people that are having similar problems with their jeep but not quite the same as us. We have a 97 Grand Cherokee Lerado, the problem we have is this. Each day when you first get in it you can drive normal for about 2-3 miles. Then all of a sudden the rpm's will go up and down, the motor acts like it wants to shut off. It runs like crap for about 1/2 -1 mile at a very slow speed. Once you get past this you are fine for the rest of the day, it won't happen again and the jeep runs great.....until the next day. We started by replacing the crank position sensor, followed that with the front oxigen sensor, replaced the plugs & wires, replaced the coolant sensor and finally replaced the pickup coil sensor in the distributer (along with caps and rotors). We even removed the cables from the battery for a time thinking that maybe that would re-set the computer memory somehow. It's still doing it! We thought it might be temperature related since it just happens the first time you get in it for the day, but why (if it's freezing out) would it not do it after it sat for 8 hours during a normal days work? The engine has to be cold then too. We are totally confused as to why this happens only once a day.
On another note: we do have problems with out auto-on lights, they flicker as you go down the road. If we turn it to manual position we can override that but then the light on the light switch itself will still go on and off. We're thinking we just need to replace the switch for that, is that right? The two couldn't be related, could they? Any suggestions?

#336 of 729 Re: We don't know where to turn! [fedup11] by xscout

Jan 21, 2008 (2:34 pm)

Replying to: fedup11 (Jan 21, 2008 1:36 pm)
I can't say my problem with my 1997 Grand Cherokee was exactly like yours, but it was similar. Car would start OK in the morning and then later as I was driving down the road it would start to run like you describe. In between episodes, car would run perfect. This would usually occur most every day but not always. Sometimes it would do this for short periods on and off all the way to work and sometimes it would just get stuck in this mode for most of the trip. I was always able to restart it if it shut down, usually with ease, sometimes not. And it could occur more than once in the day. I ended up replacing the PCM after doing the position sensor route to no avail. Check your connections on Your PCM to make sure they are clean and tight. If you do have to do the PCM, it will run you about $250 for a rebuilt with warranty if you do the switch out yourself. Make sure it is pre-programed, they may need your VIN# when you order it. It is a very easy job.

#337 of 729 Re: 2001 JGC Laredo High Pitched Noise when letting off gas pedal [agallman] by 52132

Jan 21, 2008 (8:12 pm)

Replying to: agallman (Jan 14, 2008 12:19 pm)
I got the same problem (and the same Jeep), well, I wouldn't call it a problem since it did it when it was new. It sounds like the front differential is making that sound. Do you have 4WD?

#338 of 729 2008 4.7V8 vs 5.7 Hemi by turbanski

Jan 21, 2008 (8:51 pm)

Has anyone seen performance comparisons between the new for 2008 4.7 V8 and the Hemi option? The 4.7 V8 for 2008 is a completely new design rated at 305 HP vs the Hemi's 335HP. The engines torque ratings are not that far apart either. I have a new JGC with the 4.7. It is not broken in yet and it is very quick, quiet and smooth. I have to be careful in local traffic when taking off from a traffic light I quickly find myself at 40+ MPH with very little effort. It would be interesting to see a performance comparison. Thanks.

#339 of 729 Help by aguarino

Jan 22, 2008 (6:10 pm)

I need to find the location of the oil pressure sensor on a 2000 Jeep Grang Cherokee. I have a high (4.0) reading with the ignition on. I turn off the ignition and it will drop to 0. Upon turning the ignition on (without the motor started) it will jump to 80 pp. What is going on???? Where is the sensor located??

#340 of 729 Re: Help [aguarino] by tuggajb

Jan 22, 2008 (7:02 pm)

Replying to: aguarino (Jan 22, 2008 6:10 pm)
mounted right above oil filter

Messages Page 34 of 73

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