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2000 jeep grand cherokee 4.0 rough idle,

2000 jeep grand cherokee 4.0 rough idle, acceration rough, too much fuel? idle steadys out if remove vaccumm hose off intake , played with timing, changed crank sensor, plugs, fuel pump ok, idle air control good, regulator good need help suspect fuel injectors but the check gauge light turns on and there is no engine codes

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This what I think is happening. Your engine is running rich because the ECM thinks it has too much air and so injects more fuel. When you now introduce air, by taking th e vacuum line off, the fuel mixture is now more balanced. Have you cleaned your MAF sensor? Also make sure your engine coolant is full.

Posted on Nov 09, 2017

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Anonymous

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SOURCE: 2000 chevy blazer, truck cranks

Does your battery go dead?

Posted on Dec 18, 2008

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Anonymous

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SOURCE: PO171 OBD-II Trouble Code " System Lean To Bank 1

Check PCV valve and be sure it is not stuck open.  Check for vacuum leak at intake manifold.  

Posted on Jan 01, 2009

Anonymous

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SOURCE: 2001 Ford Windstar runs rough.

remove the coil pack and look at bottom of it if it shows any cracks coil is bad very common on these vans if you have a noid light check for injector pulse on #4 if you have pulse and good blue spark most likely the injector is bad you have to remove upper plenum to get injectors out let me know how you make out

Posted on Jun 04, 2009

Anonymous

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SOURCE: I have 2004 Jeep Grand Cherokee special Edition

have you checked the IAC, idle air control,or cleaned the throttle body and plate.

Posted on Nov 25, 2009

iambanshee74

Kori Policy

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SOURCE: 1998 Jeep Grand Cherokee Laredo 4.0 6cyl, when i

Have you checked the coolant temp sensor. They also have something called a MAP(manifold absolute pressure) sensor that could be causing this issue. This sensor will have a 4 pin connector and 1 vacuum line going to it. Should be on the firewall, just behind the engine.

Posted on Feb 22, 2010

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