Internal engine vibration?
10-16-2007, 10:34 PM
#1
11 Second Club
Thread Starter
iTrader: (58)
Join Date: Jun 2005
Location: Mesa, AZ
Posts: 113
Likes: 0
Received 0 Likes
on
0 Posts
Internal engine vibration? Don't know if this is the correct forum or not but I have an '02 Z28 A4 with 42k miles on it that seems to have an internal engine vibration, or so it seems to me? I can only feel the vibration through the center console and my rear through the seat.
Specifically at 2100 RPM when revving and stationary. I have done the following:
-Unbolt torque converter so it does not spin, then rev the engine, vibration is still there.
-Swapped crank pulleys with a known good GM replacement, still there.
-Checked flexplate through inspection hole and cover where starter is, no visable cracks at all.
-Removed belts for a short and quick test.
-Pulled all pushrods, all look straight to the naked eye, but about 6 don't roll "perfect" and look just ever so slightly bent. Either that or poor manufacturing. Would think this might cause a little bit of a misfire, not a vibration?
Valve springs look intact and no misfire codes. Injector pw's are almost dead even on both sides. I'm kind of at a loss as to what it could be? Any suggestions would be greatly appreciated!
Mods to the car: QTP long tubes, true duals, tune, 3.73s, Volant CAI.
Sean
Specifically at 2100 RPM when revving and stationary. I have done the following:
-Unbolt torque converter so it does not spin, then rev the engine, vibration is still there.
-Swapped crank pulleys with a known good GM replacement, still there.
-Checked flexplate through inspection hole and cover where starter is, no visable cracks at all.
-Removed belts for a short and quick test.
-Pulled all pushrods, all look straight to the naked eye, but about 6 don't roll "perfect" and look just ever so slightly bent. Either that or poor manufacturing. Would think this might cause a little bit of a misfire, not a vibration?
Valve springs look intact and no misfire codes. Injector pw's are almost dead even on both sides. I'm kind of at a loss as to what it could be? Any suggestions would be greatly appreciated!
Mods to the car: QTP long tubes, true duals, tune, 3.73s, Volant CAI.
Sean
10-16-2007, 10:40 PM
#2
11 Second Club
Thread Starter
iTrader: (58)
Join Date: Jun 2005
Location: Mesa, AZ
Posts: 113
Likes: 0
Received 0 Likes
on
0 Posts
Stupid me, wrong forum 
If a mod can delete I would appreciate it, thx.
If a mod can delete I would appreciate it, thx.
Last edited by pcs9449; 10-16-2007 at 10:44 PM. Reason: Posted in wrong forum
