Morning Cold Start Idle Stumble ** FIXED** - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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Old 09-05-2009, 07:55 PM   #1
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Default Morning Cold Start Idle Stumble ** FIXED**

Been going around and around the car the past few days and finally figured out my problem. Thought I'd share my results.

Car: 1993 Bonneville SSEI 65k miles.

Symptoms: In the morning the car would hesitate AFTER being cranked. It'd crank fine but would hesitate when i revved or drove it. Once some heat got on the engine it'd run fine. But for about 10 minutes of early driving was near scary (especially pulling out into traffic)

What I did:
1. Replaced plug wires and plugs (they were OEM). Non-platinum Autolite plugs with Bosh Wires
2. Tested Coil Ohms. 6.04 - 6.09 across all nodes.
3. Checked for Vacuum Leaks.
4.. Cleaned throttle body (Carb cleaner - Gumout)
5. VERY CAREFULLY cleaned MAF wires (Gumout)

The culprit:
The MAF wires had built up a noticeable amount of residue and appears to have been the problem. I cleaned it off with spray carb cleaner and the black MAF wires turned silver!

Just thought I'd post this in case anyone else comes across the same problem.

(I bought a new fuel filter as well but haven't put it on yet)
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