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06-05-2013, 10:25 AM #1
Vibration - Flywheel? Converter? Harmonic balancer?
2000 SS A4
1. Vibration in Park and Neutral @ 1,450 RPM
2. Vibration when taking off slowly, at the top of 1st, 2nd, D and OD (Every time the car hits 1,450 RPM)
3. Vibration on deceleration around 45-50 mph (1,450 RPM)
4. It runs pretty smooth otherwise, the vibration will go away depending on speed / RPM.
- Engine doesn't flop around when brake torquing a little in Drive or Reverse.
- Trans mount seems fine, Trans not hitting tunnel when shifting in/out of gear
- Bangs thru all the gears fine, runs out good, no codes for misfire.
- Stock engine mounts, Stock Trans mount
Mechanic is trying to tell me I should try injectors and plugs
I'm thinking not because it vibrates on deceleration with foot off of gas pedal
Maybe the flywheel or converter? OR bad harmonic balancer?
Would a bad harmonic balancer cause these types of vibrations?
Or would the stock engine mounts soak up the vibration and make it un-noticeable?
I'm searching around but any help would be much appreciated
06-05-2013, 12:34 PM #2
- Join Date
- Apr 2010
- Fairfax, VA
- 98 TA WS6/ 01 C5 Corvette
Any codes at all? If it was an injector issue, most likely it would throw a code.1998 Trans Am WS6 - Phantom
421 CI LQ9, Tick Performance Custom Cam, TFS 255cc LS3 heads, Kooks 2" LT headers, Kooks 3" True Duals w/ high flow cats, FTP 104 lid, Speed Density Tune, 4" silicon tube, LS6 VCT, FAST 102 Intake, NW 102 TB, Oil Catch Can, SLP Bilstein Shocks w/ Vogtland Springs, CTS-V 4-piston Calipers w/C6 Z06 rotors, Stainless Steel Brake Lines, R1 concepts premium rotors, Hawk HP+ brake pads, VFN WSQ Hood, C5-R timing chain, SLP oil pump, E85 tune, Walbro 450 fuel pump, Deatschwerkz 95# injectors, Breathless performance headlights, Frost Tune, !HVAC.
(Coming Soon) BMR DSL, UMI TQ Arm
421 LQ9 14.8:1 on E85 Build/
06-05-2013, 12:45 PM #3
No just rear 02 code and AIR pump code...
Runs good, good power, I'm thinking the spark/injector issue could be ruled out since it does the same vibration on deceleration?
It feels like a circular motion type vibration, I've felt misfires before on other vehicles and I've been wrong before but I don't believe it is a misfire.
06-11-2013, 11:32 AM #4
Anyone hear of the Flex plate or Torque Converter causing vibrations in A4 cars?
Is it a common problem?
06-12-2013, 08:37 AM #5
- Join Date
- Mar 2010
- 1956 chevy
I would have the converter check for balance,had 1 out of balance and would vibrate reving in park and neutral changed out and vibration gone
06-12-2013, 10:51 AM #6
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