I was driving around a few days ago and went WOT, as I hit peak boost the car began to shake and go crazy. I pulled off to the side of the road and I saw that there was a vacuum line that came off of the intake manifold. I hooked it back up and everything seemed fine again.

Now last night when I was driving again it did the same thing, but when I checked the same vac line it was still on. I've looked everywhere for another vacuum line to be off and I can't find anything.

I checked to see if my car threw any codes and it didn't, the feeling is very hard to describe. The revs keep going up but power is gone and the car is stuttering like crazy untill I lift off the gas. The strangest part though is sometimes the car runs perfectly and then other times it does this.

Could I maybe have a bad tank of methanol? Boost leak? Fuel cut? I honestly have no idea. Any help would be greatly appreciated.

 

List more mods.

ECU... turbo...BOV... anything that may pertain to this behavior.


Does it hit full boost, then start to hesitate? or does it hesitate trying to reach full boost?

 

boost leak test is your friend if not, check carefully all the piping, from throttle body, all the way down to your front mount, check your licp. If everything looks normal, take the intake pipe off and check your turbo. good luck.

 

3" TBE
Intake
Forge BOV
HKS 280s
Methanol Injection
Stock ECU tuned by Jestr

It hits full boost and then begins to hesitate.

 

I've checked all the piping and I see none of them disconnected or moved even the slightest bit.

I'm going to remove the intake and look at the turbo in a few mins.

Edit: Removed the intake pipe and checked the turbo, everything looked fine.

 

You check for boost by pressurizing the charge piping and listening for leaks. You can spend days removing and re-installing stuff and not even find your leak or even worse creating more. good luck.

 

Good point, i'm going to try to make one of these when I get the chance.

http://vfaq.com/mods/ICtester.html

But what doesn't make sense is that sometimes the car will run strong the entire way to red line and then I make a u-turn and do the same thing and it goes crazy.

 

There are tons of vac lines on the car to look for.

 

Really? I had no idea.

 

could be the maf sensor or the map sensor. but that would surely throw a code on the check engine light.

have you readjusted your boost for the colder weather??? maybe your boosting higher since it's colder and hitting fuel cut

 

oh, your in florida. nevermind lol

 

Anyone else?

 

miles? check your plugs if your sayin its hesistating in boost... if not go back to jestr and tell them what your goin through and see if they can help you (i only say go there because thats where the car was tuned)

 

Clutch was slipping..

This thing is just becoming a money pit ;/

 

Damn i was going to say the same thing happened to me when my clutch was going out.