Stumbles at boost

[Daves929]

Car runs great, if I let it boost slowly.
If I try to boost it past like 4K, it starts to stutter unless I let it boost slowly.

Starting to get really frustrating especially since some little POS early 90's 4cyl Jetta out accelerated me this morning, I know something's wrong!

Any ideas would be awesome, thanks guys

 

[zachm611]

check for codes...

 

[turbo soup]

man i had the same problem and a bmw 318 walked on me i was soo pissed i couldnt boost... ill hit about 5psi and itll start sputtering and wont get to full boost and you could smell the unburnt gas, my car is still doing it but i let my cuz borrow it so i cant work on it, im thinking its my turbo, but im going to try to check out my air flow sensor hopefully it just needs a good cleaning, but you know what else is funny after driving it for about 45 minutes it will only sputter in 5th gear on the highway. i think the turb ojust needed to heat up or the air sensor needed to heat up and burn up the oil in it, yuck.

let me know if you know whats going on with yours ill do the same with mine

 

[jdub]

Check your fuel pressure.

 

[ians13]

Check your fuel pressure.

if you smell fuel it's running rich, due to unburnt gass most likely because you spark is being blown out, check you plugs and, check the gap.

 

[starscream5000]

Plugs definitely need to be checked. ^^

 

[Nalleywhacker]

dont mean to thread jack... but iam having the same problem and i just got new plugs a couple weeks ago and there gapped properly. i have 550cc injectors and its only hitting 5psi and it will hold it but if i give it more than quarter throtle it starts jerking. i know its running way rich i have a fpr so with those 550's what fuel pressure should i be running?

 

[89turbotoy]

if you smell fuel it's running rich, due to unburnt gass most likely because you spark is being blown out, check you plugs and, check the gap.

agreed!

 

[Supraboy89]

could be a boost leak

 

[89turbotoy]

could be a boost leak

also true

 

[Datsrboi]

Dont know if this helps. My car kept on jerking on WOT aka flooring it too but after I tq down the head to 77lbs it went away..........

 

[ians13]

dont mean to thread jack... but iam having the same problem and i just got new plugs a couple weeks ago and there gapped properly. i have 550cc injectors and its only hitting 5psi and it will hold it but if i give it more than quarter throtle it starts jerking. i know its running way rich i have a fpr so with those 550's what fuel pressure should i be running?

what kind of plugs did you put in.

 

[ians13]

Dont know if this helps. My car kept on jerking on WOT aka flooring it too but after I tq down the head to 77lbs it went away..........

i don't see how tq down head bolts would fix this.

 

[Datsrboi]

i don't see how tq down head bolts would fix this.

Well he mention jerking when he is pushing the car. And maybe it could be his gasket giving up? I have a BHG and it was jerking. The more I tq the less it jerk. And yes Im getting that fix.

 

[supramike7m]

boost leak. mine did the same thing about 4 days ago. turned out to be a hose on my boost controller was riped. check for vaccum leaks.