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Unread 10-26-2013, 10:26 AM   #1
heitzman
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2002 WJ 
 
Join Date: Jun 2011
Location: Independence, MO.
Posts: 192
Dead spot/ Hesitation when accelerating

Hello everyone, my wife's 1999 Grand Cherokee is acting up again. When she accelerates, the engine has a hesitation but not all the time. NO TROUBLE CODES. She has the 4.7 and it has 190,000 miles on it. I have replaced the catalytic converter, starter, plugs, battery cables, air filter, IAC, TPS, fuel filter and cleaned the throttle body. Can anyone please help? Thanks

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Unread 10-26-2013, 07:31 PM   #2
heitzman
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2002 WJ 
 
Join Date: Jun 2011
Location: Independence, MO.
Posts: 192
Can anyone please help?
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Unread 10-28-2013, 12:34 PM   #3
accelr8
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2001 XJ Cherokee 
 
Join Date: Nov 2012
Location: Medford, NY
Posts: 32
I would start with plugs and a throttle body cleaning, then check the TPS and the CPS. Looks like you tried all those things except for the CPS, might be worth looking at. With my '02 Laredo 4.0, a faulty CPS resulted in random hesitation especially when idling at a red light and sometimes the engine would die, but it didn't happen frequently and it didn't throw a code either. Not sure if a faulty CPS on a 4.7 would act the same but it's worth a shot given all the work you've done so far. I think the CPS is easy on the 4.7 anyway, just unbolt the starter to get to it from underneath. Good luck.
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Unread 11-12-2013, 04:52 PM   #4
heitzman
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2002 WJ 
 
Join Date: Jun 2011
Location: Independence, MO.
Posts: 192
Problem found. MAP sensor was the problem.
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