1 evo8 1

iTrader: (4)

cant figure out what the problem is.. every time i boost it after like 10 psi a weird noise comes out the exhaust and i have major power loss..
i've tried it in every gear there all the same just sputters and goes no where.
put new plugs in gaped them to the right specs.. boost leak tested and just the throttle body seals are leaking. dont know if thats from it.
anyone else have a similar issue?

ThatOneKid

iTrader: (3)

I would say compressor surge but 10 psi seems way too low. Check your wastegate to make sure thats working right. Other guess would be a coil pack or the coil wire. What did you gap the plugs to?

1 evo8 1

iTrader: (4)

it depends tho.. last time i hit like 20 psi and right when i hit that the needle started going up and down and the noise came out agian. and .032. how can it be coil packs?

jayg4u

iTrader: (2)

.32 is too large. Take it down to .24 or so

1 evo8 1

iTrader: (4)

would it make that big of a difference? with my old plugs it only did it first second and third, with new plugs it does it in all gears and idk if this is relevant but every time i boost it something smells gassy...

wang4u

iTrader: (3)

Sounds like exhaust leak. Mine was starting to smell the same under high boost (in my case, smelt like unburnt fuel when the hvac was set on fresh air). Turns out the twinscroll gasket and downpipe gasket were leaking. They also cause some boost fluctuations. Only way to test it is to put your hand nearby the turbo. Otherwise youll need to take it all apart.

It could be injector leak but you would smell gas under the hood. I would check it first to rule them out but my guess is turbo gaskets. Good luck

MR. EVO MR

iTrader: (9)

Your plugs are gapped way way to high!!
Double check but I think its .20???

IEXCELR8

iTrader: (6)

Do you have a cat on the car? what are you controlling boost with?

Here reply #22 has quite a few things for you to check. My guess is wastegate, and yes re-gap plugs to.024

https://www.evolutionm.net/forums/ev...an-12-psi.html

wang4u

iTrader: (3)

Stock is between .28 to .32. Its not the plugs. Though I do agree .24 to .27 is a better choice.

thedru13

iTrader: (24)

What are you using to control boost? MBC or EBC?

1 evo8 1

iTrader: (4)

mbc.. put your hand near the turbo? like feel if there air coming out or what?

ThatOneKid

iTrader: (3)

He's saying check if there's exhaust gas coming out where the manifold goes into the turbo, if I'm not mistaken.

llDemonll

iTrader: (21)

re-gap your plugs to .022" and see if it fixes the issue. .032 is way too big

wang4u

iTrader: (3)

Yep. If you smell gas or unburnt fuel it is definitely a leak in the exhaust. Do you smell it while the car is idling? Mine didnt, only when in boost. Any psi. Check for leaks with your hand. Or you could make up some soap and water in a spray bottle and spray it around where the turbo mates with the manifold. Ideally do it on a cold start.

Absolute worst case will be to take off the turbo assembly to check if the gaskets are bad. Before that do a boost leak test if you havent already.

1 evo8 1

iTrader: (4)

i've done a boost leak check and only the throttle body is leaking. and yea no matter what boost it smells.. sounds good i'll check that out tomorow