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PostPosted: Thu Oct 24, 2019 11:02 am 
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Joined: Thu May 01, 2014 9:37 pm
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Year and Trim: 1993 SLE
1998 SE
2001 SSEI
2002 SSEI
I would like to tighten some connections at the ICM and the ECU (not even sure any are actually loose)but don't know how to go about doing so.
Certainly don't want to damage/split any connectors.

Any tools made for this or usable for this?

What's the best way to do this?

It's to address an intermittent but total spark loss only on Cyl#1

Could a failing part do this? Which ones would be the suspects?

Thanks in advance.


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PostPosted: Thu Oct 24, 2019 6:01 pm 
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Location: Browerville, MN
Year and Trim: 2004 GXP - plus a handful of other Bonnevilles
These should be just snug, not even tight.

I'd suspect the coil or ICM.

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PostPosted: Thu Oct 24, 2019 8:59 pm 
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Joined: Wed Dec 20, 2017 9:53 am
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Location: Ottawa, ON, Canada
Year and Trim: 2003 SSEi
Try a replacement coil first.

When I traced my Cylinder #4 misfire to the cause it ended up being a defective aftermarket coil pack.

Buy an OE style (AC Delco, Delphi, etc) when replacing them.

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PostPosted: Thu Oct 24, 2019 11:04 pm 
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Posts like an L67
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Joined: Thu May 01, 2014 9:37 pm
Posts: 1294
Year and Trim: 1993 SLE
1998 SE
2001 SSEI
2002 SSEI
harofreak00 wrote:
These should be just snug, not even tight.

I'd suspect the coil or ICM.


Thank you.

I had suspected these; replaced all 3 coils and the ICM with OE parts but the problem persists.

It happens hot sometimes. Happens cold sometimes. Can go for a couple of weeks/ 250 miles at times w/o issues.

Vehicle always starts easily and never stalls, FWIW.

Can a bad camshaft position sensor cause a single cylinder misfire without a CMP sensor code?


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PostPosted: Fri Oct 25, 2019 12:49 am 
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I check the ICM sub-harness for any damaged wiring.

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