cossie0_4

iTrader: (2)

i have a 2wd cossy saph it is running 4psi of boost runs fine but when i try and turn it up it will only give me 6psi and it hesitates and backfires as if its overboosting i have changed boost hoses taken turbo and actuator off to be checked all came back ok switched amal valve and fitted diferent boost gauge still doing same thing any ideas would be greatfull as i am very close to torching the thing cheers

jon@work

iTrader: (5)

If it backfires, then it sounds like an ignition problem.

Have you looked at the state of the spark plugs recently ? What are they gapped at ?

Alvyn

iTrader: (1)

check the plug connections on the ecu also!

Noisy Boy

is it chipped?

cossie0_4

iTrader: (2)

i have checked the block on the ecu looks fine yes the car has a stage 1 baileys chip plugs are in a1 condition only recently changed they are gapped at 0.8mill motorcraft platinum thanks

jon@work

iTrader: (5)

0.8mm is perhaps a bit large - try reducing the gap to about 0.6mm

turbodoctor

yes too big a plug gap will weaken spark n cause your cos to backfire like its over boostin

cossie0_4

iTrader: (2)

i have lowered plug gap to 0.6 still same prob also changed map sensor an pluged another ecu in still same cheers

Dave Henshall

all the time, or just on boost?

if just on boost = igniotion amp on its way out IF the plugs are ok...