Crazy engine vibration

SVX10 · #1 05-20-2006, 10:54 PM

So, I just completed the 5MT swap and now I have a horrific engine vibration

.

I understand the importance of driveline angles, U-joints, and CV joints on the smoothness of the vehicle while driving. HOWEVER, I know that my problem is related to none of the above because it occurs at a stop in Neutral, when none of these components are moving. It also occurs while driving. I cannot troubleshoot any driveline vibrations until I get the engine vibration tamed. Here are the symptoms:

1. Engine codes read 24 (bypass valve), and 19 (fuel injector #6)
2. Even after clearing codes, 19 and 24 are still there
3. At a stop, in gear with clutch disengaged there is a strong vibration that increases intensity with RPM. If I put the car into neutral and engage the clutch at idle, the vibration changes slightly, but is still noticeable. Keep in mind that when I say idle, I mean 2000RPM because I'm having issues with the bypass valve and the 5MT as many members do after the swap

I will check injector #6 by unplugging it and seeing if the problem goes away. Which of the 2 rears is #6? Driver's side? During the 5MT swap, I disconnected a bunch of stuff (of course), but didn't touch the injector connectors. Is there anything that gets disconnected that could make the #6 injector act up?

Any other ideas as to what it may be? Thanks in advance

!

Mat

Manarius · #2 05-21-2006, 05:36 AM

Busted engine mount?

Beav · #3 05-21-2006, 09:15 AM

If the Inj6 code is current (not historical) that indicates either a open or short circuit, either of which will cause a misfire. Misfires cause engine vibration so the logical step would be to find out what's causing the code to pop up. Note that the code doesn't necessarily mean that the injector itself is bad - emphasis on the word 'circuit'.

SVX10 · #4 05-21-2006, 10:12 AM

Thanks for the insight, Beav. I have a question, though. Last night I went through with the engine running and unplugged each injector one at a time. Each time one was unplugged there was a noticeable degredation in engine smoothness. If this vibration were from a mis-fire, wouldn't it have showed up during that test? Man...it's going to be tough to hunt down a short circuit. Any pointers?

I was also wondering if it's possible that the timing belt slipped a tooth or something during the install of the trans. I've also been recommended to check the dog bone for binding.

Is there any way to test if mounts are bad or bottomed out or something like that?

Mat

Beav · #5 05-21-2006, 02:34 PM

Seeing how there was equal change when disabling the injectors I'd say that was a historical code.

Since the vib is there even w/the clutch disengaged and wasn't there before the swap, I'd concentrate on what was changed - incorrectly mounted flywheel/pressure plate, etc.

Speedklix · #6 05-21-2006, 02:49 PM

Quote:

Originally Posted by Beav

incorrectly mounted flywheel/pressure plate, etc.

Did you have that flywheel checked and milled?

did you pull using the wires when/if you unplugged the harnesses on the passenger side in the engine compartment?