Quote:
|
Originally Posted by Tom@lula
Carl............
Thanks for the link. Unfortunately I have seen some other posts where the crank sensor, ICM, fuel pump, filter, strainer, and more have been replaced and thought had fixed the problem only to find that a few weeks later they were back to square one. Didnt you say you were able to confirm not getting spark? I really wish someone could say they successfully figured this out. I emailed buick, asking for help. They are not much help either, seems they want to forward my problem to dealer which I have already been there. Losing faith in GM products!! 
Anyway, I will be trying a few tests this weekend if the problem happens. Maybe I will find out something. |
I am a technician of 28 years with considerable GM experience, and I'll share with you a "layman's terms" approach at finding your intermittent problem. Having read your description of the intermittent problem you're having, although a faulty crank sensor, ign module or fuel pump can cause intermittents, most often when they fail they will let the engine not start long enough for a tech to find the culprit; by your description I would be more suspecting of the ECM (brain), as I have witnessed this type of failure on numerous occasions and each time I was able to duplicate the symptom with a "tap test". Here's the test, however crude it may seem, do it anyway, so here goes. Access the ECM ( I think your model year uses a black ECM with cooling fins on the outside....I don't recall the location of the unit, if I were at my shop right now I'd look it up for you). Remove it without unplugging the wire connectors and start the engine. Tap with one hand on the outside of the unit with a force no larger than a clap of your hands when cheering for the Sooners
.If the engine falters at all, have the ECM replaced...can't do it yourself, as the Dealer has to program it with software before it will run. Hope this helps, if not, let me know.