Some update of idle, aaceleration, stall problem I have yesterday. And questions -
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Unread 04-02-2012, 06:59 AM   #1
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Join Date: Sep 2011
Location: Columbia, Missouri
Posts: 61
Some update of idle, aaceleration, stall problem I have yesterday. And questions

Below was my problem yesterday, and after I cleaned the throttle plate and TB, everything went back to normal.

But I do have a question to ask: if the rough idle, poor aceleration and stall are all caused by a dirty TB, that means not enough air got into the engine and mix with gas, so the exhaust should have more unburnt gas in it, and there should be CEL.....but there was no code, make me confused....

In contrast, if fuel system is clogged ( less gas and more air), the symptom should have no code....

Am I right in the above analysis? Anybody?

And is there anyone have ever seen a clogged fuel injector, do they really get clogged or die because of electrical failure?

Hey guys, I need your suggestion(s) here.....

Jeep: 2002 Grand Cherokee wj laredo sport, I6 4.0L

Problem: The problems happened after a 3-4 mile hill climbing with avg. speed around 20mph.

When the jeep was idling, the rpm dropped to ~500 or even lower, but it can be rescued (the rpm surged to 1500 then back to normal for a while, and then repeat the above again)

The jeep can still run, and when she was running, you hit the gas peddle, the rpm won't go above 1k rpm, and the jeep had a hard time to move forward...
The speed can increase by the surge of the rpm. If you keep the rpm stay above 1.5k rpm, she ran well, but when I came to a stop, sometimes she would stall(the rpm drop to zero with no rescue surge at all)

1. There is no code coming out, and there is no irregular smell in the exhaust.
2. The first thing I was thinking about is the TPS, I changed the current TPS 1.5 years ago.
3. The second thing I was thinking about is the camshaft position sensor, but there is no code....
4. The mechanic from O'reilly recommend sea-foam/fuel injector cleaner.

What do you think guys? Other than those, the only thing I can think about is I caught a turtle in the middle of the road....(set him/her free eventually in a lake)

Thanks~ Look forward to your suggestions.

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Unread 07-06-2013, 03:30 PM   #2
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1999 WJ 
Join Date: Jan 2013
Location: Fargo, ND
Posts: 758
I know this is an old thread but did anyone ever figure out what caused it? I have the same problem now
,,,soooo I graduated in 2013...
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Unread 07-06-2013, 04:38 PM   #3
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2003 WJ 
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Run some throttle body cleaner through it, clean the TPS. Does your exhaust seem to be coming out freely, or is your catalytic converter getting really hot? Could be that, too.

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Unread 07-06-2013, 07:23 PM   #4
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2000 WJ 
Join Date: Sep 2009
Location: Cross Lanes, WV
Posts: 6,338
FWIW, injectors can get clogged, and they can have electrical failure. I faced alot of the OP's symptoms, until two injectors finally died. I replaced all 8 and the Jeep has never run better.

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