What is the knocking sound my 99 grand am is making

Asked by Aug 09, 2013 at 08:43 AM about the 1999 Pontiac Grand Am 4 Dr SE Sedan

Question type: Maintenance & Repair

So I have a 99 grand am se v6 with
140 grand on it and its recently been
making a loud clicking/knocking
sound in the front of the car. When I
accelerate it goes away but when I'm
around 15-25 mph and decelerate is
when it's most noticeable. And it's
not soft it's loud. Like someone's
knocking on the window is what I
thought it was at one point when I
was driving haha. I can here it up to
about 35-40 mph then it kinda
dissipates or goes un-noticed. I
realize when I go fast around 50mph
and when I come back on base and
go slow again the sound isn't there
anymore and I don't know if that is
just a coincidence. I thought it might
be a bearing or ball joint or Somthing
in the knuckle but since it occurs
when I let off the gas and goes away
when I accelerate makes me think its
in the tranny?

5 Answers

"the front"....an auxilliary component such as power steering pump, power steering or an idler might do something like this~ check the auxilliary device belt~

related to engine speed....cannot be a ball joint~

if it's the engine sounds like a vacuum leak, PCV malfunction or vacuum lines fallen off (like on your fuel pressure regulator for example)~

99,915

It could be worm motor/transmission mounts allowing the CV joint on the axles to hit something. Get it on a lift and check out all the moving components in the front end.

1 of 1 people found this helpful.

rocker arm bolts have let go, pull valve covers and do inspection

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