Question about 1999 Pontiac Montana

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My pontiac montana 1999 is making a loud humming sound only when iam moving. The faster I go the louder it gets and every once in awhile it jerks

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  • Anonymous Mar 29, 2014

    I have a 2002 pontiac montana AWD that sometimes jerks alittle when i start up and when going in to reverse and when i put it in drive it either stops or happens for a second and then goes to normal.it does not make any loud sounds but the vroom vroom sound it is always after the jerking like this.it jerks and then vroom and jerks and then vroom again it is not louder then normal or makes a weirs sound almost like it is going to cut off.i hope this makes sense

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  • Pontiac Master
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You will have to ask a local mechanic to diagnose this noise for you as without hearing the noise i have no idea what it could be ,if i could hear the noise i could tell you straight away ,sorry to be a bore but its one of the joys of motoring as this noise could be a wheel bearing or a water pump and without hearing it ???'

Posted on May 17, 2011

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Posted on Jan 02, 2017

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"Loud humming" could describe many of the noises that your minivan may make. Let's start with the basics: do you hear the noise only when the van is in motion or also when the van is stopped? If you can hear the noise even when the van isn't moving, you're most likely looking at something in the engine compartment. Your serpentine belt and the alternator bearings (and, to a lesser likelihood, your power steering pump) are all sources of noise "in there." An A/C compressor on its last legs may also vibrate and cause a humming sound, though that's usually described as more of a "growl."

If you can only hear the noise when the car is in motion, the next question is whether it changes pitch/volume due to engine speed or due to road speed? For example, does the noise get quieter (momentarily, perhaps) when the transmission shifts gears? Or, does the noise simply get louder/change characteristics in a linear way as the van gets faster and/or slower?

Depending on the mileage on your van, the transmissions have been known to get quite noisy after a while, especially if you are doing sustained high-speed driving. The solution for that particular problem isn't cheap, as it involves replacing or rebuilding the transmission (the shift bands may be fine; the noise is caused by bearing wear, seal failure, and other sundry issues that still require pulling the transmission). A less expensive problem is that you might have a problem with one of your tires--a tire with separating belts may make a noise like this as it slowly tears itself apart. If you hit something hard with the undercarriage of the van, you might have a drive shaft that's slightly bent and hence is causing some sympathetic vibrations in the car because it's out of balance.

Depending on the cause, your humming sound may be one of those things that comes with driving an older car--or it may be a sign of the imminent failure of something serious. It's worth getting things checked out again to try to find the cause of the problem. You'll feel a lot better knowing what it is, even if it's something you choose not to fix.

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Check out www.carsurvey.org for more information on your problems. There are others who have had similar experiences

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