S4 TII...weird drivetrain vibration/noise...please look inside...
#1
S4 TII...weird drivetrain vibration/noise...please look inside...
i have an 87 TII with 44.8k miles.
it has a drive train vibration i cant place my finger on. it starts at about 30mph and sounds like an old school air plane engine....it does not shake the car or anything like that, and it does not affect driving at all...its just a weird noise/vibration that i cant figure out. (possibly the driveshaft where it meets the rear end?)
today i got under the car to look at it and see if anything was weird, i noticed a little gear oil leakage from the seal where the drive shaft enters the rear end. while i was under there i flushed and changed the rear gear oil with 75w-90 (with limited slip additive)..the drain plug magnet had some metallic sludge on it, but nothing bad.
after i changed the oil i left the car on jack stand's, started the car, put it in 2nd gear and let the drive train reach 40-45mph...i didn't hear any noise/vibration so i figured it was solved, and was probably the LSD.
i put the car on the ground, and took it for a drive around the block...the vibration/noise is still there.
anyone have any idea of what it could possibly be?
i have a feeling it needs a new u-joint, but before i buy a new drive shaft, id like to be closer to being sure it is the drive shaft.
it sounds like : BRRRRRRRRRRR...like if you roll your tounge when trying to speak Spanish...that's the best i can describe it.
thanks for any and all help guy's.
it has a drive train vibration i cant place my finger on. it starts at about 30mph and sounds like an old school air plane engine....it does not shake the car or anything like that, and it does not affect driving at all...its just a weird noise/vibration that i cant figure out. (possibly the driveshaft where it meets the rear end?)
today i got under the car to look at it and see if anything was weird, i noticed a little gear oil leakage from the seal where the drive shaft enters the rear end. while i was under there i flushed and changed the rear gear oil with 75w-90 (with limited slip additive)..the drain plug magnet had some metallic sludge on it, but nothing bad.
after i changed the oil i left the car on jack stand's, started the car, put it in 2nd gear and let the drive train reach 40-45mph...i didn't hear any noise/vibration so i figured it was solved, and was probably the LSD.
i put the car on the ground, and took it for a drive around the block...the vibration/noise is still there.
anyone have any idea of what it could possibly be?
i have a feeling it needs a new u-joint, but before i buy a new drive shaft, id like to be closer to being sure it is the drive shaft.
it sounds like : BRRRRRRRRRRR...like if you roll your tounge when trying to speak Spanish...that's the best i can describe it.
thanks for any and all help guy's.
#4
what else could it be? it is for sure coming from the rear end, and sounds like its coming from the center of the rear, which is why i thought it was the diff.
ill get under there and check the shaft for loose joints sometime this week....dealing with being sick right now.
thanks.
ill get under there and check the shaft for loose joints sometime this week....dealing with being sick right now.
thanks.
#5
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Join Date: Nov 2006
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My 86 NA made a noise like that after I first bought it. 30-40 mph it would hum and get quiet,hum get quiet. Changed the rear end fluid and auto trans fluid it still made the same noise.
After searching it sounded like bad u-joints. I worked on fixing other parts of the car and in time the noise went away.
After searching it sounded like bad u-joints. I worked on fixing other parts of the car and in time the noise went away.
#6
finally got a chance to get under the car, the driveshaft didn't wiggle at all, i did notice a rear diff leak near the seal where the shatf bolts to the diff....so im assuming the seal behind that area inside the diff will need to be replaced.
i was also thinking about having my rear wheels re mounted, and balanced?
its not a HUGE vibration, its more like a slight "hmmmm" that you can slightly feel.
i guess the good part is that i did not buy a driveshaft yet, and am going to hold off on that, the bad part is now i have no idea what the source of the noise/hum is?
i was also thinking about having my rear wheels re mounted, and balanced?
its not a HUGE vibration, its more like a slight "hmmmm" that you can slightly feel.
i guess the good part is that i did not buy a driveshaft yet, and am going to hold off on that, the bad part is now i have no idea what the source of the noise/hum is?
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#8
how common is a pinion seal failure? it doesnt leak all over the place, and hasnt left a drop of oil on the floor in the last week and a half my cars been sitting in the garage. i just noticed that there is a little oil in that area when i was under the car gutting the secondary cat.
#12
it happens when the car is on the ground...starts from about 30mph and continues from there...it doesnt get louder, or harsher...it just sounds faster...the vibration gets faster with speed, not rpm.
i tried to recreate the noise/vibration while the rear end was off the ground...i put the car in gear, and brought the speed up to about 40-45mph, but didnt hear the noise/vibration.
starting to think its the wheels that need to be rebalanced, but if that doesnt work...what else could it be?
i tried to recreate the noise/vibration while the rear end was off the ground...i put the car in gear, and brought the speed up to about 40-45mph, but didnt hear the noise/vibration.
starting to think its the wheels that need to be rebalanced, but if that doesnt work...what else could it be?
#14
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Join Date: Jul 2006
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Ahhhh! Please keep us updated! I'm having having the same exact problem, but I just got the car and couldn't be sure if I was just going crazy or what X-D
I'm glad it doesn't seem horridly serious... Kind of annoying though!
I'm glad it doesn't seem horridly serious... Kind of annoying though!
#15
i put the front wheels on the rear, and took the car out for a ride....still the same problem. so my wheels and tires are fine.
so now im back to thinking the U-joint is binding (it didnt wiggle when i wiggled the driveshaft...so its not loose)
i should have dropped the shaft and checked for easy articulation of the U-joint.
#16
Rallye RX7
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funny you say that, i just got back from doing that!
i put the front wheels on the rear, and took the car out for a ride....still the same problem. so my wheels and tires are fine.
so now im back to thinking the U-joint is binding (it didnt wiggle when i wiggled the driveshaft...so its not loose)
i should have dropped the shaft and checked for easy articulation of the U-joint.
i put the front wheels on the rear, and took the car out for a ride....still the same problem. so my wheels and tires are fine.
so now im back to thinking the U-joint is binding (it didnt wiggle when i wiggled the driveshaft...so its not loose)
i should have dropped the shaft and checked for easy articulation of the U-joint.
#18
i really want to solve this problem...its holding me back from starting to buy other stuff. i just dont want to start throwing money at the problem to find out i spent $1,000.00, when i could have spent $4.00 to fix this problem.
im trying to narrow the problem down, but nobody seems to know what to do.
im trying to narrow the problem down, but nobody seems to know what to do.
#24
547hp at the flywheel
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grip which driveshaft are you running? i have a t2 driveshaft im not using currently you could put in for a test and see if it fixes yer problem. wheel bearings will make a constant humming and groaning regardless of whether the car is on the ground or in the air. this sounds more like yer driveshaft is out of balance
#25
grip which driveshaft are you running? i have a t2 driveshaft im not using currently you could put in for a test and see if it fixes yer problem. wheel bearings will make a constant humming and groaning regardless of whether the car is on the ground or in the air. this sounds more like yer driveshaft is out of balance
if you want to loan me your TII driveshaft that would be awesome!