Back fire at high rpms under Boost.

[Sicotic]

Once agian another question searched but didnt really get a answer. Back to my situation i was driving decided to hit throttle to the floor and about 5k-6k my car backfired like crazy and it fell on its face, but then it drove like normal. It did it a few times at high rpms here some conclusions

1. Black plugs(Running Rich)
2. The flex pipe is broke into 2 sounds like crap.
3. How do i check my coilpack?
4. I did a BLT with soap and water nothing, how can i check the BOV?

Can someone point me in a direction.

 

[TunaTalon]

Those are classic boost lead symptoms.
Did you test around the throttle body shaft seals in the BLT?

I had that symptom recently and it was cured with a new throttle body.

 

[Sicotic]

I just did all that, but y would that cause a back fire in high rpms?

 

[dsmnic9]

I just did all that, but y would that cause a back fire in high rpms?

Sounds to me like your hitting fuel cut.

 

[Sicotic]

how do i find that it if it is a fuel cut?

 

[afsdsm]

It does sound like fuel cut, try backing off on boost a few psi if it doesn't do it, it was fuel cut and you most likely have a boost leak.

 

[Sicotic]

i checked a boost leak but didnt find nothing i did it with soap and water tho/.

 

[dsmnic9]

http://www.dsmtuners.com/forums/newbie-forum/4348-fuel-cut-what-how-do-i-fix-merged.html

Heres a link on fuel cut... If your boost is set to high for your current fuel set up, this will happen.
Check it out and maybe and can be some help

 

[Sicotic]

mine is running at stock boost on the guage it syas 14psi when full boost.

 

[afsdsm]

Would that be the stock gauge? cause 14 psi is NOT stock.

 

[Sicotic]

ya the guy before said it was set at 14 psi on stock guage, the other day i hooked up a boost guage it it was like at 25 psi but i thought it was just a bad vac to hook up so ignored, it bc when i start in first gear my car would almost go sideways, but now that i think about it i bought a 14b turbo from a guy that had a VR4. ill go take a vid real quick.

 

[afsdsm]

Do you have a boost controller? If so turn it way down till you get a boost gauge.

 

[Sicotic]

i have a boost guage just not hooked up, no controller, just hooked up my boost guage and it was at 15psi of boost

 

[Sicotic]

here is a vid of what the car does in nuetral. Imageshack - joeyscar025