scoooby slayer

iTrader: (4)

hi ive got my car boosting better know but if i turn it up as soon as it hits 25 psi it just misfires like im hitting the rev limiter ? it does it at any revs as soon as i touch 25 psi ? the car used to peak at 28 and hold 26 fine ? i wondered if anybody had encountered this problem before ? any advice much appreciated
cheers

reality

Replace Leads, Plugs, Rotor Arm, Cap, Coil.. in that order, until it goes..

Make sure the plugs are gapped right.. and that they're the right plugs!

CosKev3

As above,but leave leads till last to replace,are very good quality as long you got the standard Beru leads

cossie4i+

iTrader: (15)

Plug gap first then as above

Hope you sort it soon.

Steve.

JamesH

iTrader: (21)

Whats the voltage at the pump?

scoooby slayer

iTrader: (4)

thanks for the info everyone ive checked plugs there fine, il check the leads and stuff next if not il go get her set up and checked on rollin road.

scoooby slayer

iTrader: (4)

well i think ive found the problem. i made up a gauge and put it in my intercooler hot side pipe and put 25 psi pressure in there to check for air leeks and found some its a good way to check i found all my leeks easy
anyway i had 2 new guages on my testing gear and they both read 25 psi but when i lookd at the boost gauge in the car it was only reading 20 psi so gauge is fooked, so its backfiring because im touching 30 psi and map sensor is out of scope.

CosKev3

Could be kinked/leaking pipe to gauge

Don't think your theory on the MAP sensor is right though
Mine peaks at 35psi and I don't get any miss fire using 3 bar MAP sensor