strange problem

[fr0st]

well i finnaly got a REAL problem... this morning i fiddled with the injen intake to make it fit better and went for a test ride.. everything is a go..then unmounted my home made cold pipe to fiddle a few things and retighten everything up with no leaks.. went again to test it .. everything is alright.

tonight 2 of my friends and myself decided to film the fireballs out of my exaust.. so we went to the back of a school where it's kinda dark(er) and we filmed it.. i musta blipped the throttle like 60 times.

then i take off from there and get tot a traffic light.. take off and car bogs down.. and misses.. i go back home and recheck everything thing i touched during the day.. found nothing.. then reseted the ECU just to make sure.. same problem.. then the turbo started making a weider whilte than usual.. but got back to normal later on.. dunno why..

then i got it narrowed down to this..

when i take off at a certain posstion on the throttle, like not too soft, but not hard nor WOT.. it bucks at around 3500-4000 rpm in second and third.. very less noticable in 4th..

if i floor it, wheels spin like a mofo and the car is off like a rocket..sorta..
if i take off gently and stay below boost, i get no bucking at 4K rpm


question: could i have fuckered up my TPS when playing fire ball out of the ass ???

coze other than that the car really puses fine.. just spanked twice an audi 3.0 quattro on my way back here..

anybody got an idea?

 

[Pmpkinhead]

WGA is gone, whats your mileage. Above 40K miles and its game over.

 

[fr0st]

WGA is gone, whats your mileage. Above 40K miles and its game over.

wouldn't the boost fluctuate if it was that? mine is a rock solid 7.5 - 8 psi


hmm im at 40800 miles... but i dont wanna jump to that conclusion too fast..

 

[Pmpkinhead]

Bucking is related to intake problems with my experience. Do the WGA test. I read you can blow thru a bad one and a good one will have resistance. Dealer did mine under warranty just above 40K (all stock, no racing)

367 (mp3yellow

 

[MaxSpeedFreak]

dunno whats the problem but how do you get fireballs anyway. i do have a catless exhaust and no fire at all. not tryin to be a rice but i think they look good?

 

[fr0st]

Bucking is related to intake problems with my experience. Do the WGA test. I read you can blow thru a bad one and a good one will have resistance. Dealer did mine under warranty just above 40K (all stock, no racing)

367 (mp3yellow

yeah but wouldn't i see the boost gauge move around if ther WGA was fukered ?? i mean is i can blow through it wouldnt the boost go waaaaay up ?? it's hanging round 7 now.

im not arguning but just trying to understand

oh and i took my OBD2 scanner and it didn't return any codes.. nor do i have any CEL either.. nothing..

 

[orng1]

Give it time it will come on, I've had it come on a few seconds before I knew I had a problem and almost a week after it varies too much. It's not very smart...

 

[Mutmatt]

if your warranty isn'e up... take the intake off and bring it in and get it looked at... simple as that

 

[fr0st]

dunno whats the problem but how do you get fireballs anyway. i do have a catless exhaust and no fire at all. not tryin to be a rice but i think they look good?

get the car fully warmed up..to get the exaust hot. then just blip the throttle around 2K.. rev it to 3-4K and when it comes back down to 2K , blip it while shifting in 2nd, while being in neutral...

'll get pictures of mine

Give it time it will come on, I've had it come on a few seconds before I knew I had a problem and almost a week after it varies too much. It's not very smart...

can you explain this "coming on" ?

if your warranty isn'e up... take the intake off and bring it in and get it looked at... simple as that

warranty is up so im gonna go ATP IF the porblem is that



-------------------------------------------------

i though about something.. during a test run yesterday, the car was hanging aroun 6.5 psi at one tim and after that it came back to 7-7.5

other thing.. when it started the bucking/hesitation last night, it would hold 7.5 (cooler air maybe) but the turbo sounded diffrent and the car wouldn't pull as much.. then in the same run for no apparant reason the sound was gone and the car pulled like a mofo... im glad it came bvack as i though my turbo was on the s****...

im puzzled here.. but with this ,WGA is possible eh?

any OTHER things could cause this ???

 

[Mutmatt]

does the car pull more than it did before?

 

[1moreMPH]

you've got no EMS... dare i say it's the infamous msp hesitation?

 

[fr0st]

you've got no EMS... dare i say it's the infamous msp hesitation?

im gonna say no, since the last 3 weeks no mods has change on the car and it always went well until last night.. even in the afternoon it didnt have that 4000 rpm hesitation at 25% throttle.

does the car pull more than it did before?

no it doesnt.. the boost is at the same 7.5 psi


although a few times it dd go to 6.5 psi and came back up to 7.5 later on..



can there be another thing that can cause this?? other than a WGA? i got no CEL and no codes and evertything runs smoothly at idle and at WOT.

 

[Jaysanooch]

I would check your vacuum hose at the wastegate actuator. Actually, I suggest replacing it. The stock vacuum lines are crap but especially near the exhaust mani..as the heat just makes them brittle with time. I had a similar problem and we went to check the vauum lines and the one hooked up to the WGA just crumbled in pieces.

I'm guessing your problem occurs more when the car is warmed up...then that would explain a small crack in the hose which expands and gets worse with heat.

 

[orng1]

The check engine light would come on. I expect it will be on soon if your having issues.

 

[AcolyteMSP]

You check 02 sensor, MAF, or your ignition...
Im having similar problems so i feel your pain.

 

[fr0st]

You check 02 sensor, MAF, or your ignition...
Im having similar problems so i feel your pain.

i dunno dude,

the first time it did it, i was at WOT in second and the car just lost 90% of power, jerked like someone shut off the ignition and black smoke came out... got to the next light with my WTF face.. took off again at WOT and till i got the other light traffic light again, i was in fourth and the car was going like a N/A FS-DE --=BUT=-- i had 7 psi of boost still... then minutes later on, the power came back gradually and i got stuck witht hat hesiation at 4K when im at 25% throttle.. but at 75% to WOT it's seemless and the car pulls great.

weird no?

 

[fr0st]

ok,

so i went testing.

i blew in the WGA hose and it's sealed tight.. no problem there.. when cold and when hot.. no change.

went driving it and noticed that the hesiation is still present.. it does it in ALL gears.. and while doing it, TONS of black smoke comes out the back and the car jerks like a mofo.. and then if i can hold the throttle there long enough to get pass 5000 rpm, it just gets better

if i floor it in any gear, i get that nice 7.5 psi of boost and the car takes off like a rocket

if i take off below that certain place on the throttle, the car eases off gently and no jerking appears..

so i think it gets too much fuel (hence the black smoke)in *that* specific place on the throttle.. and since it started doing this after i jigged/blip the throttle like 60- times in 45 seconds to get to see some fireballs out of the exaust just for fun (whoopidoooo... uhg) that leads me to the conlusion thats it's the TFP thats at fault here.. it must befuckered it that specific place and letting think the ECM to give more fuel than the throttle plate is open..giving that crappy jerking n's***.


question time :

1-anybody got a better idea? coze im out now..
2-how much does a TPS cost brand new?

 

[orng1]

It sounds like when I had a chrage pipe about to pop off. It would be ok most of the time but at odd moments it would just be dead. It did it for about a week before I found the pipe on the turbo (hot pipe) was about to fall off. It drove normally most of the time but the pipe got angled I guess when it would reach boost it would lift a corner and leak boost.

 

[fr0st]

It sounds like when I had a chrage pipe about to pop off. It would be ok most of the time but at odd moments it would just be dead. It did it for about a week before I found the pipe on the turbo (hot pipe) was about to fall off. It drove normally most of the time but the pipe got angled I guess when it would reach boost it would lift a corner and leak boost.

but if you leak boost the gauge wont go up to the "right" position eh?

and you woul dhave problems at WOT.. i dont.. the car pulls like a mofo.

 

[1moreMPH]

i agree it is similar to having a loose pipe; and when mine has done that, at WOT i wouldn't have much problem -- maybe cuz the engine is sucking so much air in it doesn't make much of a difference? However, ive never had black smoke pour out like that because of a charge pipe opening up... ****** wierd...