Phantom Check Engine Light/Rough Engine/Coolant Temp. Gauge Whacky - 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 11-13-2009, 08:00 AM   #11

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You are on the right track.

The 18X circuit is frequently a bad crank sensor which explains stalling when hot etc. When they replace the sensor, a CASE learn or crankshaft variation learn (same thing) is suggested. This lets the PCM learn the actual position of the crank and therefore it optimizes the control of the engine.

The smoke test, yes I'm familiar with this. The shop has a machine that pumps smoke into the engine, gas tank or whatever system is leaking and the smoke lets you find the leak quickly and easily. Probably the easiest way to find a vacuum/evap type leak.
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