for some reason my car started doing a very strange shaking thing about a week ago. It only happens in first and second gear and only at WOT. It doesn't do it if you rev it or if you tach it out slowly. It boosts fine and runs fine except for when you nail it. I tried changing plugs hoping it was ignition break up, nothing. Ive checked eveything I can think of but I have no idea what it could be. if some one could give me some ideas it would be greatly appreciated, thanks.

 

Wheel hop?

 

no its not as bad as wheel hop. it just starts shaking and the exhaust changes a little.

 

does the car still rev smoothly when the "shaking" happens

 

nope it kinda studders a little and revs slower than before.

 

You live in Raleigh, have we met?

 

i don't know, were you at that meet last saturday?

 

You got AIM , dont want to steal the thread... i'm at blacksupra94

 

nah sorry man. never got around to getting AIM.

 

Oh, well i have a 94 mb also. I didnt make it to the last meet , but i will be at the next one.

 

cool probably see you there, if mines still running.

 

any ideas? u joint or something inthe drivetrain maybe?anyone ever had flywheel counterweight loosen up?it feels like something is just holding it back from accelerating

 

possibly a clogged cat?, if so I wouldn't floor it a lot all that built up pressure could blow the motor

 

Sounds almost identical to the boost problems i was having on my FD. My car is stock and had the same "hesitation" feeling at WOT mainly in 2nd and 3rd gear. The problem got worse and worse. Finally i figured out i had a vacuum leak and ended up replacing all my OEM vac lines with silicone ones. My car now runs like a raped ape.

 

thanks for the ideas, i'll start looking around some more when i get home from work

 

wouldn't I have some more lag if the cat was clogged?

 

could i do a short run with only a dp without messing something up?

 

If you can keep your boost at 10PSI, which will be next to impossible with no restrictions in the exhaust.
So i'm saying no.
Not to mention something about having a flame thrower under my car would make me nervous.
-Ben

 

gutted my cat to rule that out. didn't help. i think it is in the drivetrain. i've been looking around for anything loose underneath but can't find anything.

 

I was at mo-kan and saw a 7 runnnig i asked him if i could look under the hood, when he popped it the motor was shaking really bad! i couldnt figure it out, its a rotary it shouldnt shake!

 

my thoughts exactly. i think i'll try putting some motor mounts in it. they don't look broke but i could shake the engine a little with my hand.