fuel pump or rear end?
#1
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Location: colorado
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Car: 92 RS
Engine: 3.1V6
Transmission: 700R4
fuel pump or rear end?
I got this weird noise coming from the rear of my car. 92RS V6/700R4. When driving and the engine around 2000rpm, gear or speed doesn't seem to matter, I hear a rumbling in the rear. I hought it was the fuel pump, but sitting still out of gear and holding engine speed around 2000 or anywhere else it won't make the noise, only while driving. Can my pump only be making the noise under load? Wouldn't a problem with the rear end cause noise at all speeds? Doesn't seem logical that the rear would make noise at just 2000rpm in every gear. Is it possible the sound could be coming from my muffler, but again it should make the noise sitting still. Anyone have any ideas before I just start replacing things?
#2
Moose,
Don't just replace things, but continue to analyze the problem. Try changing gears at the speed that makes the most noise, and see if the noise changes. Rear axle noise is generally relative to load and road speed, so if the noise frequency doesn't change with road speed, it may not be the axle.
Your ideas about the exhaust / muffler may be worth looking into, as well as tires, brakes, and the driveshaft.
Don't just replace things, but continue to analyze the problem. Try changing gears at the speed that makes the most noise, and see if the noise changes. Rear axle noise is generally relative to load and road speed, so if the noise frequency doesn't change with road speed, it may not be the axle.
Your ideas about the exhaust / muffler may be worth looking into, as well as tires, brakes, and the driveshaft.
#3
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Car: '86 Berlinetta
Engine: 350
Transmission: 700R4
To add onto Vader's post.... it could also be a semi loose mount somewhere, that with road vibration + motor shakin the car = your mount bouncing around enough to make the noise?
And do you have your spare tire, and scissor jack in the car still? If so, you should try taking them out and seeing if the problem persists, they could be bouncing around too. If those are the problem, then put them back and tighten them back down real good.
And do you have your spare tire, and scissor jack in the car still? If so, you should try taking them out and seeing if the problem persists, they could be bouncing around too. If those are the problem, then put them back and tighten them back down real good.
#4
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Car: 92 RS
Engine: 3.1V6
Transmission: 700R4
Those are good ideas, and I've got some time now to take some closer looks. I have done some more testing and I could only get it make the noise at the end of first gear right before it shifts.
It's turned to winter hear in colorado now and I hope I can avoid serious work for a while.
It's turned to winter hear in colorado now and I hope I can avoid serious work for a while.
#6
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Car: 92 RS
Engine: 3.1V6
Transmission: 700R4
I'll try that later this week. I took the differential cover off and the gears all look good, pulled the pass. axle too and checked the bearing, and everything looks normal. Road test again after I get more gear oil.
#7
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Car: 1991 camaro RS
Engine: CharlesOdoryOB
Transmission: 82513892892
Axle/Gears: pbr disc 3.27 nine bolt
ive noticed this same noise in both my camaro and my girlfreinds firebird it seems to me its as soon as the tranny kicks into OD "4th" it has sorta a "hummmmmm" around 35- 40 mph with a light right foot lol
only time i notice it
the mechanics at my work said they didnt notice anything wrong with it when i had them take a drive in it
both cars are V6 as well
only time i notice it
the mechanics at my work said they didnt notice anything wrong with it when i had them take a drive in it
both cars are V6 as well
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#8
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Car: '86 Berlinetta
Engine: 350
Transmission: 700R4
Originally posted by Azrael91966669
ive noticed this same noise in both my camaro and my girlfreinds firebird it seems to me its as soon as the tranny kicks into OD "4th" it has sorta a "hummmmmm" around 35- 40 mph with a light right foot lol
only time i notice it
the mechanics at my work said they didnt notice anything wrong with it when i had them take a drive in it
both cars are V6 as well
ive noticed this same noise in both my camaro and my girlfreinds firebird it seems to me its as soon as the tranny kicks into OD "4th" it has sorta a "hummmmmm" around 35- 40 mph with a light right foot lol
only time i notice it
the mechanics at my work said they didnt notice anything wrong with it when i had them take a drive in it
both cars are V6 as well
#9
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Car: 1991 camaro RS
Engine: CharlesOdoryOB
Transmission: 82513892892
Axle/Gears: pbr disc 3.27 nine bolt
thats what i figured anyway
but for some reason i wasnt sure
its what i told my girlfreind
just wasnt positive
but for some reason i wasnt sure
its what i told my girlfreind
just wasnt positive
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