Question about 2004 Pontiac Montana

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Started hearing odd noise when accelerating. kind of sounds like a remote control car or plane like a kid would play with. Can hear the gears changing. What could this be?

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  • dphillips616 Dec 30, 2010

    I'm not sure the last solution suits my problem. The noise starts when I accelerate. It is not too loud or grinding. In thinking about the noise, it reminds me of a small car backing up (not sure if that helps). Kind of like a kids remote car...but I can hear the gears change as I accelerate. It's only when I first accelerate. Once I'm driving it subsides. When I start going again, it starts again. It's faint. Could hear it just a little, but had to turn radio off to actually figure out what I was hearing. I hope the additional info helps....

  • dphillips616 Dec 30, 2010

    Thank you... will check it out!

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  • Pontiac Master
  • 19,396 Answers

Hi.

First ensure that the noise is not coming from the front wheel, in that case check CV joints and tyre balancing and alignment.

I think that the problem is valve noise. In that case it would be coming from engine block. Go there and check.

Other noise that may occurr when you accelerate or upshift can be given by defective fuel pump and timing chain. Go to the nearest dealer, report the problem and ask them to check if the noise from engine is within range.

Some Internet thread reports EGR valve makin noise in this model. The EGR valve is located on top of the engine block may also make noise. From your description I have the impression that this is not the problem.

If noise is whining and only when accelerating, then check the serpentine belt and the devices operated by the belt.

A poorly insulated spark plug cable may spark against the engine block causing a ticking noise whose frequency increases when accelerating. This is quite uncommon and can usually notice even observing the engine idleing.

Regards.

Ginko.

Posted on Dec 30, 2010

  • Ginko
    Ginko Dec 30, 2010

    Hi D.

    You are welcome.

    Happy New Year.

    Ginko.

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  • Pontiac Master
  • 17,970 Answers

As it is a manual gearbox its quite possible, that, over time the gearbox might have developed slightly worn or otherwise damaged teeth on some of the lower ratio gear-wheels which, when in mesh, can cause a low growling noise. If the higher gear-wheels are undamaged then, as when you shift into these higher gears, the sound should disappear.

Of course it could be a worn synchroniser, but these only tend to be problem when actually shifting up or down and, if a gearbox bearing is worn, then the sound given off by a dry or damaged bearing normally becomes more intense as the bearing speed increases.

Test it, check it and keep us updated.

Posted on Dec 30, 2010

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