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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 12-23-2014, 07:53 PM   #1
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Default no fire to the coils

i have a 96 bonneville with a 3.8 and im not getting any fire to the coils ive replaced the camshaft senser,crankshaft senser and had the ignition module check still no fire what could be the problem please help
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Old 12-24-2014, 09:30 AM   #2
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have to test the wires. the spark is controlled by the crank sensor, which goes to the ICM. after the engine starts and gets to about 800rpm the pcm(and wiring to the ICM)gets involved

https://www.gmforum.com/trouble-shoo...m-test-299761/
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Old 12-24-2014, 12:22 PM   #3
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would the security system have anything to do with it not wanting to start
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Old 12-24-2014, 01:04 PM   #4
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No, the security system, has nothing to do with spark......it can affect the injectors......but that is not your problem......

If you replaced the crank sensor correctly(new one? Who did it?), the cam sensor has nothing to do with spark, and the ICM checked(who checked the ICM?), then you have a wiring, connection, or power/ground problem......

Start from the beginning.....any symptoms leading up to the no spark? Or just one day, the car cranked over and didn't start?

Scanned for codes?

Did a shop install the crank sensor?

As far as the ICM is concerned, JW gave you a good link to test it......

However, if you had it pulled and tested in a parts store, that is not a 100% true test......have seen them tested OK and were no good....

If the ICM is good, and and a new crank sensor was installed ok, and you have no spark on ANY terminal, then:

Could have an open wire in the harness to the ICM.......could have a bad connection(terminal spread too much) at the crank sensor or ICM connector....could have a bad ground, or a power problem(fuse)......there is no way three coils would fail at the same time.....

Last edited by Tech II; 12-24-2014 at 01:06 PM.
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