1993 Bonneville....surging.....HELP - 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 04-01-2010, 07:42 PM   #11
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I've used needles to back probe through connectors. That way you can check the signal voltage, reference voltage, and grounds. It may be a bad connector somewhere in between the TPS and computer.

NOTE: I back probe through the connector, not through insulation. You don't want to wreck the insulation.

Last edited by enslow; 04-01-2010 at 07:44 PM. Reason: Add NOTE.
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Old 04-01-2010, 10:23 PM   #12
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From what I can tell I'm getting good juice to the connector. It'* right at 12 volts.
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Old 04-01-2010, 11:39 PM   #13
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Check the ground and the signal voltages too.
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Old 04-02-2010, 07:43 AM   #14
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Well if I'm getting 12 at the connector I don't think there is a problem. I think there might be a relay going out somewhere.
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Old 04-02-2010, 04:40 PM   #15
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Well, on the advice of a good friend, I took off my Ignition Mod and took it to get tested. 4 out of 6 circuits are bad. So...this could be the culprite I have been looking for. Unfortunately it'* a $140 part. looks like I'll have to wait until pay day to replace it. Thank God it'* easy to get to.
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Old 04-04-2010, 11:16 PM   #16
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Alright...Now I'm pulling a CODE 18. What would that be?
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Old 04-10-2010, 07:41 AM   #17
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code 18 cam/crank sensor circuit. check connections at ECM the crank position flash,sensor and the ignition control module. Also check for opens or shorts in the sensor wiring. Check for bent vanes in the interrupter ring on the vibration damper, and check that the crank sensor is not damaged or misaligned. All info is from HAYNES manual I hope this helps.
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