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Old 05-25-2012, 09:48 AM   #1
SB09
 
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Thump when putting M6 into first gear.

I've got a distinct thump that I can feel in the floorboard on my M6 when I put it into first gear sitting still. It only happens some stops randomly. Seems to happen when the transmission is warmed up or after a good jog down the highway. The car doesn't move or feel like it's going to move. I just have this thump. Any ideas on what is happening? The car has 4800 miles on it currently. I think I've been pretty nice to the clutch as well.

If I keep the clutch pressed and cycle from neutral back to 1st no thump. But, if I go back into neutral, release the clutch and re-press, then go back to 1st the thump happens again. I can reproduce it as many times as I want while sitting still. Then, the next stop I make. No more thump. Weirdest thing I've ever seen.
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Old 05-25-2012, 10:00 AM   #2
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Mine does that as well, you probably are also seeing a grind during high rpm 1st to 2nd shifts

check out IdealG's master cylinder thread

http://www.camaro5.com/forums/showthread.php?t=212552

I am thinking the clutch is not fully disengaging
so I will be trying this master cylinder fix either way
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Old 05-25-2012, 11:33 AM   #3
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Most of my manual trans cars have done that, including several mustangs and my Camaro. Not necessarily a thump but a good clunking noise from the trans. I don't care about it. It sounds normal to me. Just a symptom of a manual transmission I guess. My Camaro shifts just fine.

Last edited by Coyotekiller; 05-25-2012 at 02:42 PM.
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Old 05-25-2012, 11:47 AM   #4
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If I know I'm gonna be sitting stopped, I gently put mine into first gear before I come to a complete stop...then back and forth neutral to first gives no clunk...
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Old 05-25-2012, 02:38 PM   #5
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Quote:
Originally Posted by SB09 View Post
I've got a distinct thump that I can feel in the floorboard on my M6 when I put it into first gear sitting still. It only happens some stops randomly. Seems to happen when the transmission is warmed up or after a good jog down the highway. The car doesn't move or feel like it's going to move. I just have this thump. Any ideas on what is happening? The car has 4800 miles on it currently. I think I've been pretty nice to the clutch as well.

If I keep the clutch pressed and cycle from neutral back to 1st no thump. But, if I go back into neutral, release the clutch and re-press, then go back to 1st the thump happens again. I can reproduce it as many times as I want while sitting still. Then, the next stop I make. No more thump. Weirdest thing I've ever seen.
I am sorry for your frustration on this issue. Have you taken this to the dealership for diagnosis? It sounds like you still may have a warranty, but your dealership should be able to check for any applicable warranties once diagnosed. If you have additional concerns, please don't hesitate to contact me via PM.

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Old 06-13-2012, 01:45 PM   #6
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I am sorry for your frustration on this issue. Have you taken this to the dealership for diagnosis? It sounds like you still may have a warranty, but your dealership should be able to check for any applicable warranties once diagnosed. If you have additional concerns, please don't hesitate to contact me via PM.

Brandon
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I really wish I could take it in to the dealership. However, I need to be able to reproduce the problem for them to diagnose it.
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Old 06-13-2012, 03:01 PM   #7
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Is your clutch depressed far enough?
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Old 06-13-2012, 03:06 PM   #8
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Is your clutch depressed far enough?
All the way to the floor. First time it happened I thought, " Oh crap, didn't quite get the clutch in all the way. " Second time I knew it was pressed all the way to the floor.
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Old 06-13-2012, 03:47 PM   #9
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All the way to the floor. First time it happened I thought, " Oh crap, didn't quite get the clutch in all the way. " Second time I knew it was pressed all the way to the floor.
Okay, good, next question, your not trying to slam it in there are you? I always just hold a steady pressure on the stick until it "falls" into first, I don't jam it in.
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Old 06-14-2012, 07:05 AM   #10
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When its doing it, press in the clutch pedal and wait a few seconds before going into 1st. If it doesn't "clunk" then what's happening is that the transmission is warm and it might take an extra second or two for the input shaft to stop spinning once the clutch is pressed. If so, its completely normal, no need to worry about it.

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