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Nub
Dodge Dakota
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9/19/2011
17:34:13

Subject: Intermittent, erratic spark
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Message:
My 1999 3.9l is running rough at idle all the way up to 2500
rpm. When ever I accelerate it makes popping sounds in the
exhaust like it's running lean. I checked fuel pressure.
Running 45 psi at idle. The spark on a timing light for cylinder
4 was showing up very intermittently. I took the wire off and
checked spark at the cap and that showed the same time gap
in spark which was very delayed and weak. Shortly after
maybe a week later still while trying to diagnose the problem I
did another check with the timing light and now cylinder 1,3,
and 6 are showing very quick sparking compared to the other
cylinders. I'm lost as what could be causing this. No check
engine light either....

Thanks for any input



pssst
Dodge Dakota
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9/19/2011
19:50:51

RE: Intermittent, erratic spark
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Message:
Quit guessing, Check for codes.



daddio
Dodge Dakota
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9/19/2011
20:38:17

RE: Intermittent, erratic spark
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Message:
Have you performed a tuneup on it lately?



JackT
Dodge Dakota
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10/01/2011
13:39:58

RE: Intermittent, erratic spark
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Message:
Your air filter is dirty. That will cause your spark plugs to not fire right.



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