I have the PFS PMS in my car, but since I have changed my motor in 2001, the car runs great and don't smoke, but just make a lot of backfires.. A LOT! Even if the car is hot, it makes some backfires like, just in releasing the accelerator, POW POW!

Do anybody here knows a little bit about the Peter Farrell ECU and can explain me why my car is backfiring like that...

Thanks in advance.

Max

 

Get it dyno tuned, or tune with a wideband o2 sensor on the street.

Take out some fuel at idle and the low rpm ranges, under light and medium load and it will help it out. But do this ONLY after you have accurately measured your air/fuel ratio.

thesaint

 

is it popping in the exhaust or is it fueling up and blowing bit flames?? usually when its poppng in the exhaust it is too lean on the over run,

 

like the_saint said - you are just running too rich. post your mods and maps. also check wade L.'s site. you shouldn't have any backfiring if you have a stock cat or highflow.

 

Don't know if this will help, but my chronic backfiring with occasional machine-gun popping was caused by a leaky exhaust manifold gasket.
I'm running a DP and cat-back only.

 

I have a Greddy sports cat back exhaust,
Bonez downpipe,
act clutch
PFS PMS
stock turbos at 10psi
stock catalytic converter
HKS intakes (mushrooms)
PFS intercooler
Pettit Racing AST
Blow Off Valve Tial
Cusco strut bar
stock fuel pump
brand new engine since 2001.
but never tuned since engine replacement

Max

 

No flames, just popping ... POP POP POP!


Max

 

thats still ok, my Apexi exhaust is glowing red ;o)))

 

Lol :P

Max

 

As toad man said check the gaskets, of there all fine give it more fuel on the over run it is too lean.

 

Thanks guys, do you know how much cost the Exhaust manifold gasket?


Max

 

Not cheap. there's two and both should ne replaced together.
N3A1-13-461 qty 2 80 bucks each. A specialist would be able to tell if one was leaking. All the time I thought my car was running rich, but finally the gasket eroded to the point the motor buzzed with a leak noise consistently.