Update - Stuttering cause has been found - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-29-2005, 07:51 PM   #1
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Default Update - Stuttering cause has been found

This was what I wrote in a thread about 2-3 weeks ago.......


Quote:
Originally Posted by nick *
I need the opionions here.........

I replaced the plugs and wires a month ago and the motor has responed well to the changes, incresed gas mileage is a plus.
I just noticed yesterday that while I was EASY accelerating from a dead stop, the motor was stuttering. As I increased the speed the stuttering disappeared . This only happened twice in a 20mi trip. My suspision is a Fuel filter, but what do I know, I am only guessing.
Other than this problem, the motor runs fine.
what do you think?
How does a bad fuel filter react?
I started to disassemble the engine to fix the UIM I saw this...........



and this



This is the #1 plug wire, it was right against the fan blade.
I guess I will see if it fixes it once I put it all back together, I am sure it will........
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Old 10-29-2005, 08:49 PM   #2
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i'm sure that is the cause of your stuttering nice and easy fix thats for sure
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Old 10-29-2005, 10:55 PM   #3
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Wow, good find there. Was it the cooling fan blades right side? That gully in the wire was carved out by rotation of the cooling fan, eh?
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Old 10-29-2005, 11:00 PM   #4
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Quote:
Originally Posted by markwb
Wow, good find there. Was it the cooling fan blades right side? That gully in the wire was carved out by rotation of the cooling fan, eh?
Correct
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Old 10-29-2005, 11:44 PM   #5
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I wonder if that is covered under warrenty fan blade mutulation.
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Old 10-30-2005, 12:46 AM   #6
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Good catch, Nick. I wonder if you could have found the bad wire by looking close at night with the engine running. Sometimes you can see the arc flash from bad wires in the dark.

O well, 20/20 hindsight............

Good luck going back together.
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Old 10-30-2005, 03:04 AM   #7
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That is a nasty lookin' wire right there

Glad you found that!
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Old 10-30-2005, 10:04 AM   #8
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Nick check the resistance on the coil packs to ensure the coil didn't degrade due to the apparent arching. I doubt it did. But the test is free..

Good find. If you started it and looked at this motor in the dark, an apparent spark jump should have been seen.

One way to test for good plug wires is to clean your motor.
(Skip cleaner)
Start car
Hose off

A performance difference would be noticed.
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Old 10-30-2005, 10:51 AM   #9
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Quote:
Originally Posted by BillBoost37
Nick check the resistance on the coil packs to ensure the coil didn't degrade due to the apparent arching. I doubt it did. But the test is free..

Good find. If you started it and looked at this motor in the dark, an apparent spark jump should have been seen.

One way to test for good plug wires is to clean your motor.
(Skip cleaner)
Start car
Hose off

A performance difference would be noticed.
I will check it when it is reassembled........

As far as a spark jump in the dark, I don't think that would have happened because everyting around the wire was PLASTIC. I think there may have been a spark buble but not a jump to a ground surface, does what I just wrote this make sense?
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Old 10-30-2005, 01:49 PM   #10
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Quote:
Originally Posted by nick *
does what I just wrote this make sense?
Yes, it does make sense because of the plastic fan blades. It looks like quite a bit of conductor in that wire has been cut away, maybe resulting in a high resistance or intermittent conduction when firing that cylinder.
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