unusal night - Perth-WRX.com

n1cK · #1 10-05-2007, 09:39 PM

i was just around the corner from my house tonight and i was in second gear and i gave it a bit...and there was like a huge bang in my engine and like my boost just went off...i thort i blew my turbo

...i pulled into my garage and the car was still running and my revs wer going up and down on 700 to 1200...the car went off and i turned it back on and the revs were fyn staying on 1000...i went for a lap around the block (fast lap) and everything worked awsome again...but when reving down in gears my car doesnt pop as much as it did it now burples a little more...

Does anyone Know what that bang was

heres one for the Subaru Tech Division

Thanks

Nick

Smokey · #2 10-05-2007, 09:45 PM

sounds like a vacuum hose has come off, then boost cut, then limp mode?
or afm :P

n1cK · #3 10-05-2007, 09:51 PM

Quote:

Originally Posted by Smokey

sounds like a vacuum hose has come off, then boost cut, then limp mode?
or afm :P

afm is off dude...got an autronic..you think it could be the vacuum hose

Fabs · #4 10-05-2007, 09:53 PM

shit at least the car bounced back!! lol

n1cK · #5 10-05-2007, 09:56 PM

hmm does anyone know

Mister Two · #6 10-05-2007, 10:22 PM

hows the power? Does it drive sluggish? Stable vacuum at idle?

Are you sure the bang came from the engine bay? could have been a momentary overfuelling and the bang was a big backfire caused by fuel exploding in the exhaust system. It can happen when the spark plugs get old or fouled and the spark is "blown" out and the air and fuel mixture is dumped unburnt into the hot exhaust system.

n1cK · #7 10-05-2007, 10:26 PM

na drive fine ay....when i went for the quick lap the boost was all good idle was good sitting on 1200 (its tuned rich

) the bang felt it was under me sorta near the downpipe and the cat....if the spark plugs are old or fouled could that fuck the car up....the car is prity old My98..

Mister Two · #8 10-05-2007, 10:36 PM

Get new spark plugs. Get a compression test just to be safe and sure. And then get on a dyno with a AFR readout.

But id say you just had a big ass backfire.

The knock sensor probably picked it up as big time detonation and retarded your timing heaps. That would explain your crappy idle that quickly restored itself once the ECU was seeing that the knock sensor was reading normal again.

mr_psi · #9 10-05-2007, 10:36 PM

it goes bang so he takes it for a fast lap.... niiice

n1cK · #10 10-05-2007, 10:40 PM

Quote:

Originally Posted by Mister Two

Get new spark plugs. Get a compression test just to be safe and sure. And then get on a dyno with a AFR readout.

But id say you just had a big ass backfire.

The knock sensor probably picked it up as big time detonation and retarded your timing heaps. That would explain your crappy idle that quickly restored itself once the ECU was seeing that the knock sensor was reading normal again.

cheoz man

would it be ok for now?