I have a 2004 Pontiac Montana. The engine rattles on the left side when under acceleration. Sounds like a diesel. I cannot pinpoint the noise. Any ideas?


Asked by Nov 26, 2015 at 02:01 PM about the 2004 Pontiac Montana Base

Question type: Maintenance & Repair

3 Answers


Sounds like old fashioned pinging or denotation. Your knock sensor should be hearing this and retarding the ignition timing to stop the denotation. Most likely the knock sensor is bad. HTH. -Jim


I thought that might be the problem but there are no service-engine codes. Is it possible that a bad knock sensor would not trigger a code?

1 out of 1 people think this is helpful.

If the knock sensor is just not hearing the noise that could be the case. Try a higher grade of fuel at your next fill up. If the noise goes away then the knock sensor would definitely be my first suspect. HTH. -Jim

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