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Having a problem. When I got the car it ran fine. Other day it started randomly stalling. Checked the ecm codes because engine light was on. It was throwing GM code 41. Which is usually a bad cam sensor. I just replaced the cam sensor, the interuptor and the crank sensor and reset the code. Even after replacing all those it's still having the same problem. What else could it be?
Welcome to the site... Other areas to check can include vacuum leaks, PCM grounds, fuel issue, or even possibly the O2 Sensor... If you don't have a 1991 Chassis Service Manual for your vehicle, I do have one available for sale...
I just replaced the cam sensor, the interuptor and the crank sensor and reset the code. Even after replacing all those it's still having the same problem. What else could it be?
Probably the cam sensor magnet. It sits in a little plastic cage that sits in a hole in the cam timing gear. You have to disassemble the whole front of the engine to get to it. It is a big PIA to replace a $12 part. You'll need an oil pan gasket.
I had a 1993 Buick LeSabre with a 3.8L V6 that was the same car. I recall I had to replace the ECM on it because I had a Quad Driver Module failure. I don't recall what code it was, but it was a pretty easy repair. Once I installed the new ECM it got rid of the code.
Could be the harmonic balancer. If it has a bunch of cracks in the rubber, it could be separating and giving a bad signal to the cam sensor. The balancer has a magnetic pick up to trigger the cam sensor upn each revolution. You tube has videos to help determine if this is a problem and how to replace which is not hard. Hope this site helps the original poster. Trent in Los Angeles.
Could be the harmonic balancer. If it has a bunch of cracks in the rubber, it could be separating and giving a bad signal to the cam sensor. The balancer has a magnetic pick up to trigger the cam sensor upn each revolution.
Balancers going usually begin to rattle. Many suspect rods or mains knocking. I had one go bad on my '91 last fall. Man did it go quick. I heard it knocking and at first suspected something worse myself. Next thing I felt an awful vibration that went away quickly. When I got home this big chunk of rubber was sitting on the coil pack. I found it interesting that the originals were pressed on and the replacments (A/C Delco) are not. This balancer was so bad I had to rotate the center of it on the outer just to get to the bolt holes for the puller:
March 14th, 2017, 08:57 PM
