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Intermittent crank no start

Tiny
LORI2760
  • MEMBER
  • 2003 CHEVROLET IMPALA
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
Replaced fuel pump, no change.
Pulled the number six wire to check for spark and the Coil sparked then the car suddenly started. We have done this over a half dozen times now and every time that the car does not start normally we pull the number six wire and the car starts.
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Monday, August 6th, 2018 AT 5:49 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

I would suspect the module and coil packs are the issue. It is common for them to fail. The reason they fail is high resistance in the ignition wires to the plugs.

I suggest you replace the module, coils and ignition wires.

Roy
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Saturday, March 6th, 2021 AT 1:20 PM
Tiny
LORI2760
  • MEMBER
  • 4 POSTS
I replaced the coils and wires around 25,000 miles ago, I did not replace the module. What I do not understand is why the car will start every time when we pull the number six plug wire from the coil pack. We have not tried to pull any of the other wires to try and start the car except to check for spark and it has sharp spark on all three coils.
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Saturday, March 6th, 2021 AT 1:20 PM
Tiny
LORI2760
  • MEMBER
  • 4 POSTS
Also, the car does not even try to start when it is acting up. Like there is no gas or spark until we pull the wire from the coil and then the car starts and runs great.
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Saturday, March 6th, 2021 AT 1:20 PM
Tiny
LORI2760
  • MEMBER
  • 4 POSTS
The car starts and then we shut it down and replace the plug wire. Car starts up again and runs great.
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Saturday, March 6th, 2021 AT 1:20 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
That was 25,000 ago. This is now

It is in the internals of the module.
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Saturday, March 6th, 2021 AT 1:20 PM

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