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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 2 of 73

#9 of 729 Check engine light by daniemu

Mar 10, 2007 (6:42 am)

I have a 1995 Jeep Grand Cherokee and yesterday the check engine light came on. I didn't notice any change in how the vehicle was running (the temperature and oil gauges were fine). I stopped at a shop to get it checked out, but wasn't able to get in. When I got back in my car, it didn't come on the rest of the way home. I wasn't sure if I should take it in, or if this was possibly a fluke.

#10 of 729 Re: Check engine light [daniemu] by commit

Mar 30, 2007 (5:25 pm)

Replying to: daniemu (Mar 10, 2007 6:42 am)
I have an 02 and had the same problem. The engine light would come on for about a week and then go off. If you have an AutoZone near you ask them to run their system on it to give you the exact reason the light is coming on. If it says slow emissions leak, which is what mine said, you can do one of two things. One, check your emissions hoses to make sure they aren't cracked, this is really simple, just open the hood and there are only two hoses. The guys at Autozone can show you where they are just in case you're not sure. The next thing, and this is what fixed mine, was replace your gas cap. Mine had a slow leak around the gasket. Hope all works out okay.

#11 of 729 '05 JGC shuts off by acewindu

Apr 02, 2007 (9:26 am)

I have an 05 JGC, and it shuts off while slowing down. The dealer can't figure it out, replaces O2 sensors, etc. They say they don't understand the codes the computer sends, then they bring in Detroit. They are no help either. This leads to dangerous situations while driving. They termed it Parking Lot Manuever issues. It only happens while I'm slowing down. It happened again when I turned on the AC, and it idled up and down from 0 - 600 RPMs. Any ideas?

#13 of 729 p cherokee engine ???? by jeepache

Oct 28, 2006 (1:41 pm)

Ok here goes I have a 1987 jeep cherokoee with straight 6 Biggest problem is that it will run but has no power(wont even move) the throotle when depressed kills the motor or bogs it down even more then it already is. My attempts to fix this are new timing gear and chain cap and rotor the timing is set but yet the motor just sits there and barely runs and I want to emphasize when I move the throttle it either kills the motor or bogs it down. Where is the next place I should look for a cure? TPS? IAC?

#14 of 729 Re: p cherokee engine ???? [jeepache] by mullins87

Oct 29, 2006 (5:24 am)

Replying to: jeepache (Oct 28, 2006 1:41 pm)
Is it getting enough fuel and air? My guess is the fuel pump isn't pumping enough fuel, or the fuel filter is so clogged that enough fuel can't get to the engine. Is this engine injected? I thought it would have a carb.

#15 of 729 Re: p cherokee engine ???? [mullins87] by jeepache

Oct 29, 2006 (11:36 am)

Replying to: mullins87 (Oct 29, 2006 5:24 am)
yes its MPI I used my fuel pressure tester and im getting 39 psi constant at the fuel rail no matter if I have the regulator vacuum on or off. I also replaced the fuel pressure regulator. fuel filter is also new

#16 of 729 Re: p cherokee engine ???? [jeepache] by mullins87

Oct 29, 2006 (6:05 pm)

Replying to: jeepache (Oct 29, 2006 11:36 am)
Have you checked that pressure with the engine revved up? Sometimes a bad fuel pump will pump just enough fuel to keep the engine running at idle, but not enough to do anything else. You might try disconnecting the return line to see how much fuel is being sent back to the tank. Should be a considerable amount.

#17 of 729 Re: p cherokee engine ???? [jeepache] by mullins87

Oct 29, 2006 (6:10 pm)

Replying to: jeepache (Oct 29, 2006 11:36 am)
With it being injected, the TPS could be the culprit. When you depress the throttle, the TPS tells the computer to send more fuel through the injectors. Well, if it's not doing its job, then when you crack open the throttle plate the engine leans out and dies.
 
A repair manual should give the acceptable range of resistance for an operable TPS. Using a Ohm meter, test the sensor to see if it's bad.

#18 of 729 Re: p cherokee engine ???? [mullins87] by jeepache

Oct 29, 2006 (10:29 pm)

Replying to: mullins87 (Oct 29, 2006 6:10 pm)
ok ill try that but would it make the motor at idle speed run really rough? shouldnt it be limited to whe you use the throttle? Mine idles really rough and sometimes will die on its own.

Messages Page 2 of 73

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