89 jeep cherokee starting probs!!
03-20-2014, 02:56 PM
#1
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Year: 1989
Model: Cherokee
Engine: 4.0l
89 jeep cherokee starting probs!!
89 jeep cherokee 4.0l v6 4wd!! i replaced the cps plug and still having hard starts any answers?? 
03-20-2014, 11:27 PM
#3
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It's that damned 4.0L V6. Most unreliable engine. Ever.
Is there something about the app that's preventing new users from seeing the OEM Cherokee Tech forum or preventing them from seeing that Cherokee Chat is specifically a non-tech forum?
Is there something about the app that's preventing new users from seeing the OEM Cherokee Tech forum or preventing them from seeing that Cherokee Chat is specifically a non-tech forum?
03-21-2014, 08:01 AM
#4
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
03-21-2014, 08:08 PM
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Year: 1989
Model: Cherokee
Engine: 4.0l
it starts and runs but wen u try to start it it cranks for a while b4 it starts up.i changed the cps plug still the same. engine was rebuilt it has 50,000 miles!! runs great jus hard starts??
03-21-2014, 08:27 PM
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Year: 1990
Model: Cherokee (XJ)
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Hard starts. You mean long crank time before it starts? Runs good or bad once it starts?
03-21-2014, 08:34 PM
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Year: 1988
Model: Cherokee
Engine: 4.0
Long crank time is normal for a renix. Ecu waits for signal to the cps or something like that. Im sure cruiser knows
Last edited by 884x4; 03-22-2014 at 12:29 AM.
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03-21-2014, 08:46 PM
#8
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I believe the ECU has to see 4 (or was it 5) complete revolutions of the flywheel/flexplate before initiating spark. That data comes from the CPS. Cruiser can correct me if I'm mistaken. That said, a more detailed description of "long crank" will be needed. From personal experience, 2-3 seconds of cranking is not unusual for an '89 XJ.
03-21-2014, 08:47 PM
#9
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Year: 1990
Model: Cherokee (XJ)
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300 RPM. Test CPS per my tips number 7.
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