Sputter; slight vibration (Fuel System?) - Page 2 - 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 06-14-2003, 02:20 AM   #11
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Tomarrow night I'll watch for sparks. One of my MSD wires has a little wear in the outer coating, but nothing crazy. I patched it with some good ol' red tape.

Problem is, it could be so many things.
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Old 06-14-2003, 02:20 AM   #12
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May want to test your MAT sensor too. Couldnt hurt if its messed up it will cause the mixture to be off.
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Old 06-17-2003, 03:41 AM   #13
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ahh hmmm...I don't know that I trust those fuel injector cleaners too much. I knew I was getting mine rebuilt so I used STP'* cleaner every tank for 4 tanks then pulled them and sent them to www.injectors.com. Here'* the results:

BEFORE:
Cylinder: 1 2 3 4 5 6
Avg: 74.5 77.1 76.4 72.7 73.2 71.2 Difference: 8.4%
Reverse cycle: DIRTY DIRTY DIRTY DIRTY DIRTY DIRTY
Spray pattern OK N/G N/G OK N/G N/G

AFTER:
Cylinder: 1 2 3 4 5 6
Avg: 77.8 77.9 77.9 76.4 77.1 76.4 Difference: 2.0%
All patterns good


So after 4 bottles of cleaner the spray pattern on 4 out of 6 was bad and all 6 were rated as dirty, also a difference of 8.4% is unacceptable for smooth performance. This costed about $160 for all of them after taxes and *&h. Plus they come with all new pins, they're painted, and new o-rings. Might be something to consider if you wanna dig them out.
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