ehhh my car does that when its not warmed up properly.. sounds either like that or fuel cut

 

i looked through vaccuum lines, intercooler piping, spark plugs and wires and r all good, i dont know ut is wrong but i dont like it! Do u think it could be an o2 sensor?

 

Is it tuned?? If your are running some type of fmu/timing retard to make up for boost its just not running right in boost because it doesnt know what to do. Your car will run very rich in boost like 8:1 air/fuel ratio and missfire. Get it tuned...if it is tuned and is just doing this all of the sudden i would sudgest check out your map sensor.

 

check timing, spark plug, fuel tune, coil, ect almost anything


personal I had, problem with wrong plug gap, coil dieing, and lose plug wire

 

Sounds like you're running rich. I'm assuming you're using an fmu?

 

well that is great that it is sputtering, because we dont even know what the car has for fuel management. more info on your setup before we can help you diagnose it.

 

tune tune tune tune tune tune tune tune tune tune

 

tune tune tune tune tune tune tune tune tune tune

While we all support your enthusiasm and the need to tune, do try to be atlteast a little helpful...


To the original post...

Did your car always run like this or did it just start?
What is the setup? FMU? Any sort of engine management? AFC? stand-alone?

We're gonna need some details..

 

Quote: tokinalcoholic on Sep/10/06tune tune tune tune tune tune tune tune tune tune

While we all support your enthusiasm and the need to tune, do try to be atlteast a little helpful...


To the original post...

Did your car always run like this or did it just start?
What is the setup? FMU? Any sort of engine management? AFC? stand-alone?

We're gonna need some details..

Ok, sputtering is going to be caused by ignition misfire, or timing, or fuel (too much or too little). Running the proper engine managment and having a professional tune your car is going to go a long way. For all we know he is running with a 12:1 FMU and 550CC injectors.

All im saying, not to be a dick, is people wonder why thier cars dont run right...it seems to be they just dont grasp the concept of of a turbo car.

 

...it seems to be they just dont grasp the concept of of a turbo car.

So true for many.

Let's hope we can solve this guys issue before things get ugly for him.

 

If you post more detail on your set up and tuning that might help us better assist you.

as of now all we know it sputters. but we dont know what you have for tuning and such so we'd have no idea where to start.

 

sound like lack of fuel or preignition...

you need a tune just like everyone esle said. and more info couldnt hurt

 

Ok guys sorry for getting back so late. But here is some more info. I have had the turbo kit on now for about 10 months and it has run awesome up to now. As for tuning, I had my car professionally dyno tuned by one of the best in the country. I got my car tuned by Jeff Evans of Evans Tuning. He had the white hatch on Pinks if anybody watches that show. Anyway, I am using a P28 tuned with Neptune. 255 walbro pump, 780cc injectors, precision turbo, inline pro header, Edelbrock Victor x intake manifold, tial wastegate and blow off valve. There is some more infor for you. Thanks for all your help guys!

 

Sounds like ignition issues. Jeff tunes on the conservative side and for fuel ecomomy out of boost. Sounds like you might be a bit lean and have ignition issues.

Do you have a wideband to watch your motor?

 

pull your plugs and have a look

 

sounds like ignition to me, also though check and make sure your wastegate is functioning properly, sometimes if they are releasing the boost before they are susposed to the car will stutter

 

Check your plugs. I don't think its going to be a fuel problem since you haven't done any changes to the car after your tune. Check the plugs and make sure they're still ok. If they look ok, check the gap on them. U might need to bring the gap down a bit..

 

It is most likely plugs just because the look fine doesnt mean everything. cahnge them and make sure you gap them to the same gap as it was tuned on. aslo if its not that then its most likely running lean than running rich. either way both is not good on the motor.

 

I had the same problem with my car just a little bit ago. It ran fine for a while after i got the car dyno tuned, then all of a sudden it would sputter like crazy under WOT. I fixed it by gapping my spark plugs closer. The spark was getting blown out by the turbo causing the car to sputter.
Just a note: The injectors i had in originally lokked fine when i took them out. Everything was burning clean and they looked great. The gap was just wrong.

The stock gap for my car was .04 and i changed it to .02 or .025 I believe.

 

friend of mine has the same problem, only it can rev fine in neutral. but when in gear and driving, once it hits boost it sputters and miss fires.

 

How long ago was the car tuned? Its starting to get colder out and if the correction factors arent on then this could slightly throw the tune off. Also when does the car start to breakup? Is it an RPM related thing or just anytime you try and go into boost?

I would change the plugs and gap them pretty low. Something like .018-.020.

I mean if the plugs are fine and the tune is on it could be anything. Could be the fuel pump going out. The fuel filter is clogged. Ive even had the injector pre-screens get clogged up. Then it could be ignition related. Something like the ignitor could be going out. But from my experience that is an RPM related thing usually for me right around 5-6K is when it starts to show. The tach will stop working also if the ignitor goes out.

The thing is there could be one or many of a possible thousand problems that could be the cause. Get back to us and we can start throwing more ideas your way.

To the guy with the emanage. Get ride of the missing link. I would even say get ride of the emanage.

 

Yeah, Neptune should be able to handle everything without the E-manage. Are you experiencing boost spike when you throttle it?? The turbo could be kicking in more mixture than the timing can handle and thus, the engine may not have a nearly complete combustion.

 

u might want to change the spark wires. i had a set of msd wires and they went bad on me. the resistance checked out fine and everything but the car would misfire when in boost. replaced ground wires no help. replaced spark plugs tried different gaps no help. got a set of magnacor wires problem solved