ok i have 2001 mk4 boosted at 12 pounds. its chipped. the check engine light flashes nink its the vaccumow. there is a vacuum leak from the boost and o2 sensor is bad. it used to sputter when i boosted now it sputters when i accelerate. the coils are good but havent checked the sparks plugs.. and everytime it boost some weird noise comes out i think its vacuum leak from the boost .. what do you guys think it is?

 

easy.
ill go through a whole process you should go through to see what exactly it is.
1st obviously pop the hood and turn your car on.
check to see if you hear and air leaks coming from any of your vacuum lines. also see if any have popped off.. if you hear anything, check the obviously lines that are out in the open, after that, check the 2 that are under your intake manifold, they tend to crack easy since they constantly get hot and cold all the time.
if that's not it, disconnect your maf sensor and see if that makes a different in how the car operates. if it doesn't make a difference then that might be your verdict.
if it does plug it back in and take on coil pack out at a time and see if that makes a difference in performance.
if its an o2 sensor it will be the top one since the bottom one only reads what is going in after the cat and doesn't control air/fuel mixture.
hope this helps a little..

 

I would get you car scanned with a vagcom, then it will be easier to figure out what the issue is. Im leaning to a spark issue ie coils, plugs, or wires. What are your plugs gapped at?

 

any news on your misfortunes

 

naa i havent had time today im startin with the maf sensor.. its not the spark plugs i replaced them .. i recently changed the flywheel from dual to single with a stock clutch wuld that have anythin to do with the problem..

 

i was getting the same symptoms when i had a bad coil pack and my coil packs were only 2 weeks old


..... are you throwing any codes?

 

yaa it was the coil packs and spark plugs but .. now it says faulty air pump or air solenoid valve wtf?????!! wat is that never heard of it.. and my turbo sounds as if papers were flying off .. and when i accelerate to the maximum it like pushes back.. but thats sumtimes...

 

any shaft play on the turbo?

 

it might be that im gonna put a k004 in between today and tommorrow to see if thats the problem then ill let ya know

 

well my axle popped off i think i know what the problem was lol axle was loose