Strange vibration
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Joined: Jan 2020
Posts: 60
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From: Indiana
Strange vibration
So I’m getting ready to leave work today, and I go out start the car to let run for a bit before I take off, go to the car after 10min or so depress the clutch and pull up the gate. Give a rev up to around 3500 rpm and it starts vibrating really bad, and sounds like something is still turning while it’s happening. I immediately turn it off and restarted and was fine until I rev it again and it did it again. Depressed clutch this time to see if it changed anything and no still vibrating. Shut it off again and just drove home carefully because im freaking out at this point. No drivability issues, made it home ok. Rev it up a couple times and it hasn’t done it again. Went out and beat it a little and still no drivability issues, any thoughts you guys may have on this?
clutch was installed last year along with torque tube bearings, this year the car was cammed and tuned and an oil leak fixed on the rear of engine ,so I assume the clutch assembly was R&R again. Any thoughts much appreciated thanks
clutch was installed last year along with torque tube bearings, this year the car was cammed and tuned and an oil leak fixed on the rear of engine ,so I assume the clutch assembly was R&R again. Any thoughts much appreciated thanks
Last edited by Nlsl0906; May 3, 2023 at 08:43 PM.
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Joined: Aug 2022
Posts: 243
Likes: 93
From: Ashburn, VA
Presume nothing unless its in the service quote my friend 
When you did the clutch I presume the did the full Monty (flywheels, clutch disc, pilot bearing, throw out bearing)? Something may have not went back together correctly...or gave up the goose on disassembly to fix rear man seal (as the torque tube has to come out to access that). Was the torque tube checked when it was out? It does have two rubber joints that sometimes give up the ghost with age. To me...with the limited description you provide...Kinda sounds like Throw Out bearing to me.
It could also be the tune [just throwing out ideas]. Maybe a lean spot in the fuel maps at 3,500 with no load? To test, Id start, let it idle a bit...then take it to the RPM it starts to stumble and shake and see if you can hold it there for like 20 seconds stumbling...and then raise the RPM to see if it goes away at a higher RPM...then back to the suspected RPM...then lower. Do it with clutch in and clutch out.
Good Luck,
Joe
When you did the clutch I presume the did the full Monty (flywheels, clutch disc, pilot bearing, throw out bearing)? Something may have not went back together correctly...or gave up the goose on disassembly to fix rear man seal (as the torque tube has to come out to access that). Was the torque tube checked when it was out? It does have two rubber joints that sometimes give up the ghost with age. To me...with the limited description you provide...Kinda sounds like Throw Out bearing to me.It could also be the tune [just throwing out ideas]. Maybe a lean spot in the fuel maps at 3,500 with no load? To test, Id start, let it idle a bit...then take it to the RPM it starts to stumble and shake and see if you can hold it there for like 20 seconds stumbling...and then raise the RPM to see if it goes away at a higher RPM...then back to the suspected RPM...then lower. Do it with clutch in and clutch out.
Good Luck,
Joe
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Joined: Jan 2020
Posts: 60
Likes: 25
From: Indiana
Yes everything clutch related was replaced as well as torque tube bearings and bushings, you mention the tune so that’s where I’m gonna start because the tune was just done on Friday. I was heading back to the shop today to have the idle adjusted, so I’ll have them look into this as well.
