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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 43 of 74

#413 of 729 1999 Grand Cherokee Miss Fire on Inclines only. by colborn1

Aug 17, 2008 (10:48 pm)

I have a 1999 Jeep Grand Cherokee 4x4, 4.7v8. I have started to get a miss while driving on inclines at a speed of 60mph and up. Gas mileage has gotten poor.2 mechanics have put on an engine diagnostic check and found no codes. One mechanic was at a local dodge dealership. Took it for a test ride, with computer hooked up, felt and observed the miss fire and still has no clue what it is because of no codes. Told me I was better of if it quit all together, then they would have a better idea. I cant afford to wait til that happens. Can anyone help? I dont know what else to do. Dont want to cause more damage to the engine.

#414 of 729 Re: 1999 Grand Cherokee Miss Fire on Inclines only. [colborn1] by tuggajb

Aug 18, 2008 (4:23 pm)

Replying to: colborn1 (Aug 17, 2008 10:48 pm)
how many miles on your jeep?
 
if it were me i would change the oxy sencers on the exaust and see if that helps as they ware out and if still in pramaters of computer will add gas as if running lean when your not thus over fueling engine under load prob have two one in front of cat converter and one behind change them both

#415 of 729 Re: 1999 Grand Cherokee Miss Fire on Inclines only. [tuggajb] by colborn1

Aug 18, 2008 (10:29 pm)

Replying to: tuggajb (Aug 18, 2008 4:23 pm)
I have 160000 miles on it. If the o2 sensor is going out would it show up on the diagnostic check? I will give it a try. I am sure they do need changed. I appreciate the advice!!!

#416 of 729 Re: 1999 Grand Cherokee Miss Fire on Inclines only. [colborn1] by tuggajb

Aug 19, 2008 (2:16 pm)

Replying to: colborn1 (Aug 18, 2008 10:29 pm)
wouldnt show up as long as it is in fac spect bur could be on the edge of bad with 160000 miles has had to work like h ll so could be worn out as stated i shoes to much oxigen in exaust tikink engine is running lean adds more gas

#418 of 729 2006 Grand Cherokee Limited - ocasionally engine goes off when driving 5kms by retamoce

Aug 22, 2008 (9:12 am)

I own a 2006 Grand Cherokee Limited with 15000 kms, I had it for the last 8 month (very impressive vehicle), in the last couple of month in two separate occasions when driving below 5kms the engine suddenly went off, I only get the hand brake light on, immediately turn the key on and the engine starts as if nothing had happened.
Has anyone got a suggestion?

#419 of 729 Re: 2006 Grand Cherokee Limited - ocasionally engine goes off when driving 5kms [retamoce] by retamoce

Aug 22, 2008 (2:18 pm)

Replying to: retamoce (Aug 22, 2008 9:12 am)
something important that I must mentioned is that this problem only happened when I was about to pull over, once happened at the traffic lights and another time at the car park.

#420 of 729 Re: 1999 Grand Cherokee Miss Fire on Inclines only. [colborn1] by srajeweler

Aug 22, 2008 (8:27 pm)

Replying to: colborn1 (Aug 17, 2008 10:48 pm)
I had a miss at 60mph and up with my 1999 grand cherokee as well. Not 02 sensor that fixed it. Took it to Jeep Dealer and they did not know, finally a transmission shop figured it out. It was bad tires causing the transfer case to shift in and out of four wheel drive. Replaced tires and the problem went away.

#421 of 729 Re: Engine miss at high 70mph under load. [colborn1] by srajeweler

Aug 22, 2008 (8:36 pm)

Replying to: colborn1 (Jul 16, 2008 10:54 pm)
Did you change the wires as well? I would replace them . During the change you may have developed a crack in one which arcs at high speed...

#422 of 729 Throttle Position Sensor by jilld73

Aug 26, 2008 (9:31 am)

I'm wondering if anyone can provide a picture, diagram or description of the TPS location on a Jeep Grand Cherokee? Is this part easy to install? Any words of wisdom would be appreciated.
 
I'm trying to fix this check engine light on a tight budget and this is what the code Auto Zone pulled for me pointed to.

Messages Page 43 of 74

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