Another 2001 4.0 P0306 issue
#31
Thread Starter
Junior Member
Joined: Oct 2010
Posts: 31
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From: DFW
Year: 2001
Model: Cherokee
Engine: 4.0
compression listed in 1st post... have not repeated with #6 wet compression test yet, will do later today... rgr on the oil change... wanted to make sure the journals were cleaned a bit before the upcoming oil change... it almost seemed to run better (slightly smoother) after the seafoam. The only other thing that bothers me is there is no noticeable change in idle when disconnecting the #6 fuel injector connector. All the others cause a noticeable miss. A light bulb in #6 connector shows good cycling. Swapping #5 & #6 fuel injectors does not move the original misfire from 6 to 5.
#32
well, 155psi compression is actually good. if it were getting wet, it would have better compression. that tells me that you need to consider actually just replacing that injector.
#33
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Joined: Jun 2009
Posts: 472
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From: Middletown, Ohio
Year: 1997
Model: Cherokee
Engine: Straight 6 4.0L
you need to put the new MAP sensor in and let it run. When i did mine they weren't the same length and it needed time to run and self-adjust...but i cant remember if it was the MAP sensor or the MAF..on the intake...are they the same thing?
#34
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Junior Member
Joined: Oct 2010
Posts: 31
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From: DFW
Year: 2001
Model: Cherokee
Engine: 4.0
Should be a MAP... did it run rough while it was learning?
#35
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Junior Member
Joined: Oct 2010
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From: DFW
Year: 2001
Model: Cherokee
Engine: 4.0
currently showing these along with the new misfires... (one of the latest things we changed was the crankshaft position sensor)...
P1391 (M) Intermittent Loss of CMP or CKP Loss of the Cam Position Sensor or Crank Position sensor has occurred. For PL 2.0L
P0352 (M) Ignition Coil # 2 Primary Circuit Peak primary circuit current not achieved with maximum dwell time.
I guess it's time to put the old one back on?
P1391 (M) Intermittent Loss of CMP or CKP Loss of the Cam Position Sensor or Crank Position sensor has occurred. For PL 2.0L
P0352 (M) Ignition Coil # 2 Primary Circuit Peak primary circuit current not achieved with maximum dwell time.
I guess it's time to put the old one back on?
#41
Thread Starter
Junior Member
Joined: Oct 2010
Posts: 31
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From: DFW
Year: 2001
Model: Cherokee
Engine: 4.0
w ww.precisionautoinjectors.com/category.sc;jsessionid=3AA985B6B510EC29B9F761389D5 713AB.qscstrfrnt02?categoryId=3
The engine does run quite a bit smoother, but we still have the misfire... starting to look like we need to start looking back at the valves and head problems.
Last edited by membrain; 11-11-2010 at 06:39 AM.