possible turbo problem

[WeldingHank]

i know my car ISN'T a Mazdaspeed or a MP3 by no means. but i thought some of you guys may be able to help me out.

car as described in Sig.

While under full boost, my car will buck like a horse. and only under full boost (WOT)

i have scence replaced. Plugs,wires(genuine mazda NGKs), cap, rotor, fuel filter, and ignition coil. i have run out of ideas!! any help is greatly apprecitated. hey, its turbo mazda too!

 

[Logan]

Sounds like you are hitting whatever fuel cut your car came with. Turn down the boost and see what happens.

 

[1sty]

Probe talk didn't have any good advice to give?

 

[WeldingHank]

no boost cut, have chipped car to combat that problem. i am only running 11PSI.

Probetalk is nothin but a Flamewar, and i don't use it for anything else other than communicating with my MaPOC bretheren.

 

[YP5 Toronto]

what about fuel delivery? Upgraded pump? Inline? FMU?

 

[1sty]

Does the turbo use a wastegate that could be near dead?

 

[WeldingHank]

internal wastegate. the car can handle up to about 13 PSI on the stock feul system. so that shouldn't be a problem. while this is happening, my A/F guage reads 3 bars rich.

 

[PaulMP3]

do you have a fuel pressure gauge?

 

[WeldingHank]

negative.

 

[1sty]

internal wastegate. the car can handle up to about 13 PSI on the stock feul system. so that shouldn't be a problem. while this is happening, my A/F guage reads 3 bars rich.

To much fuel, could be a bad regulator.
Also if the waste gate diaphram gets screwed up I could see it leaking then building boost sparaticly.

 

[WeldingHank]

well, a friend of mine is sending me 3 regulators, soooo we will give that a go

 

[PaulMP3]

To much fuel, could be a bad regulator.
Also if the waste gate diaphram gets screwed up I could see it leaking then building boost sparaticly.

do you have a boost gauge?

 

[1sty]

do you have a boost gauge?

Yes i do, thanks for asking
Why did you qoute me?

 

[WeldingHank]

yes i do have a guage.

 

[1sty]

Is it steady when the car bucks

 

[WeldingHank]

i can't really look at it, i mostly have to hold on to the car.

 

[1sty]

get a passanger to watch it.

 

[WeldingHank]

another thing i may add, it only does it when the car is warm. when the engine is cold and all, it boost fine.

 

[PaulMP3]

Yes i do, thanks for asking
Why did you qoute me?

lol, just adding to your statement about the waste gate, wandering about steady boost.

 

[acidbug]

It definetly sounds like a feul pressure regulator problem..sounds like the car is bogging down due to too much fuel..My friend Boostedlx..had similar problems and cured it with purchase of a new fpr!!

Chas