hey all. im pretty new to the wrx scene and was just wondering if anyone had the same issue's as what i have...

about 2weeks after i bought the car it seems to misfire and backfire hard out once it has been driven for a little while, i have noticed mainly between 2000-3000rpm? it seems like the car aint getting any fuel? still idles well, car has the following modz:

k&n cai
exhaust turbo back
boost controller (7psi)
139ks on clock
aps tmic (thick bugger)
sti bov

other then this its stock

so far i have done major service (oils, belts, coils, fuel filter, ngk leads, subaru upper engine flush, ignitor, platnium plugs, battery, afm, sti bov, ecu(2nd hand), new alarm, injectors cleaned........ and it still does it

all of the parts are brand new except the ecu and it still does the same thing. I have ordered a new walbro pump and 02 sensor, so once they arrive i will fit and see if any diff.

is it possible the 02 sensor is stuffed? any help would be greatly appreciated.

Mike

I would say it would be your AFM, Mine used to do the same thing..

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00 forester GT. 90 rodeo turbo dualcab

Air flow meter or crank angle sensor.

Mine started backfiring hard and got worse and worse. STechnic found out it was the crank angle sensor playing silly buggers.

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]

Spray some electrical circuit cleaner on the afm. And see how you go.

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:)

ditch the k&n filter too

thanks for the info guys i heard the k&n filters are bad for these afm... i will change the filter and get the crank angle sensor checked out once i get back from up north. also the afm is brand new from subaru. only done maybe 3 hours since its been in the car

again thanks for the help guys. let ya know how i go

Mike

ok took to work shop once i got back from up north and found out the o2 sensor was stuffed. car pulling hard now and never skips a beat

Pulling hard at 7psi???

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nah its running 14.7psi now with walbro fitted just waiting for vf23 to get here now. hope it goes well

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