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2007 Buick LaCrosse 3800 CMP Issues

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Old Nov 28, 2022 | 01:34 PM
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Default 2007 Buick LaCrosse 3800 CMP Issues

Hello everyone, I’ve been having mysterious issues concerning the Camshaft Position Sensor Circuit. The CMP sensor signal has perfect waveform and about 6 volts up to the Ignition Control Module but from the ICM to the PCM the signal changes in a somewhat erratic way. This is causing my car to hesitate and sometimes stall. I have replaced the ICM twice with brand new aftermarket ones.
The Crank and Cam sensors are new along with the harness. I have also verified that I have good power and ground to the ICM and the sensors.
I will post a video of the Cam signal to the ICM (yellow line) and the signal from the ICM to the PCM (red wire).
Any ideas would be greatly appreciated.
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Old Nov 28, 2022 | 01:46 PM
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It won’t let me post the video so I’ll post a few pictures so you have an idea. The waveforms are supposed to match each other but as you can see they do not.


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Old Nov 28, 2022 | 02:23 PM
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Use OEM ICM and sensors.
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Old Nov 28, 2022 | 07:22 PM
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Originally Posted by carfixer007
Use OEM ICM and sensors.
I figured that out today actually. I used an OEM ICM off of my Park Avenue and the car ran perfect. Thank you for the advice.
Do you know what brand was OEM for these cars? I think it’* ACDelco
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Old Nov 28, 2022 | 10:35 PM
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GM is all Delco. OEM is the only way to go on these kinds of components.
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