Misfire, weak spark.

Tiny
CARAVAN2001
  • MEMBER
  • 2004 DODGE DAKOTA
  • 3.7L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
After replacing all ignition coils, spark plugs, battery terminals, fuel injectors, and a complete visual inspection of harness and connectors. I am still getting miss on #6 cylinder and very little contribution from #2 and #4. Same side of engine. I have done a compression check okay. Fuel pressure within specification. Checked trouble codes, they indicate bank 1 too rich, slow response from oxygen sensor, and of course the misfires on #6 cylinder. I have run out of money and ideas. Would like to get further trouble shooting Direction's.
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Friday, May 6th, 2016 AT 3:29 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
These are hard to find on today's vehicles, have a mechanic freeze frame it to see what sensor is messing up in engine or maf.
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Friday, May 6th, 2016 AT 7:05 AM
Tiny
CARAVAN2001
  • MEMBER
  • 9 POSTS
I think you may be right about MAF sensor because when I was using test light to check power at misfiring cylinder coil connector, at the same time I would touch the coil power wire I would hear a slight tone coming from the throttle body which is where the MAF sensor is. Thanks for the advice. I will have a scanner put on it.
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Friday, May 6th, 2016 AT 8:53 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,959 POSTS
Also, I would do a leak down test on all cylinders, I'm thinking you may have an intake valve that is bleeding combustion fire into other cylinders which would cause the problems you are talking about.
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Sunday, May 8th, 2016 AT 12:41 PM

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