Is this normal?
Thread Starter
Staging Lane
Joined: Feb 2012
Posts: 61
Likes: 0
From: Easley, SC
Is this normal? Hi,
I have an 02 z28 A4 w/ headers, no cats, SLP loudmouth, lid, ported TB and tune.
When I'm sitting still with the car running (in gear or out makes no difference) I feel a shake through the bottom of my seat every few seconds. The idle speed on the tach never changes (600 rpm) and if you are outside the car you can't see the car shake or hear a miss, but it always has that shake through the seat every few seconds.
I don't have a whole lot of experience with V8s so is this just something these cars do with open exhaust or should I be looking for a problem?
Thanks!
I have an 02 z28 A4 w/ headers, no cats, SLP loudmouth, lid, ported TB and tune.
When I'm sitting still with the car running (in gear or out makes no difference) I feel a shake through the bottom of my seat every few seconds. The idle speed on the tach never changes (600 rpm) and if you are outside the car you can't see the car shake or hear a miss, but it always has that shake through the seat every few seconds.
I don't have a whole lot of experience with V8s so is this just something these cars do with open exhaust or should I be looking for a problem?
Thanks!
TECH Fanatic
Joined: Jun 2007
Posts: 1,062
Likes: 2
From: Westminster, MD
Depends on the motor and trans mounts. If they're rubber they may be cracked/old and need replaced. If they're poly/solid it's normal. Rubber (stock style) vibrate the least/absorb the most, poly is in the middle, solid transmit the most vibration because they don't allow flex.
If you do need them replaced, most people, including myself, advise poly motor mounts and a rubber replacement for the transmission mount.
If you do need them replaced, most people, including myself, advise poly motor mounts and a rubber replacement for the transmission mount.
Hi,
I have an 02 z28 A4 w/ headers, no cats, SLP loudmouth, lid, ported TB and tune.
When I'm sitting still with the car running (in gear or out makes no difference) I feel a shake through the bottom of my seat every few seconds. The idle speed on the tach never changes (600 rpm) and if you are outside the car you can't see the car shake or hear a miss, but it always has that shake through the seat every few seconds.
I don't have a whole lot of experience with V8s so is this just something these cars do with open exhaust or should I be looking for a problem?
Thanks!
I have an 02 z28 A4 w/ headers, no cats, SLP loudmouth, lid, ported TB and tune.
When I'm sitting still with the car running (in gear or out makes no difference) I feel a shake through the bottom of my seat every few seconds. The idle speed on the tach never changes (600 rpm) and if you are outside the car you can't see the car shake or hear a miss, but it always has that shake through the seat every few seconds.
I don't have a whole lot of experience with V8s so is this just something these cars do with open exhaust or should I be looking for a problem?
Thanks!
Do you run an aftermarket dampner?
Thread Starter
Staging Lane
Joined: Feb 2012
Posts: 61
Likes: 0
From: Easley, SC
Depends on the motor and trans mounts. If they're rubber they may be cracked/old and need replaced. If they're poly/solid it's normal. Rubber (stock style) vibrate the least/absorb the most, poly is in the middle, solid transmit the most vibration because they don't allow flex.
If you do need them replaced, most people, including myself, advise poly motor mounts and a rubber replacement for the transmission mount.
If you do need them replaced, most people, including myself, advise poly motor mounts and a rubber replacement for the transmission mount.
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