boost problem help please
 

hi all ive got a 1994 jdm wrx since buying about 7months ago ive noticed its quite hesitant under boost, it will come in about 4k then suddenly hesitate then boost very noticeable in 1st gear, today i fitted a new back box & decat centre section & also a polar performance ecu & now it seems slightly worse any ideas please thanks? my mods are bailey dump valve,tsl group n back box & decat centre section, hks panel filter & polar perfomance ecu

You could check plugs,coilpacks and maf

thanks for the advice think ill definately change the plugs & elimate it bit by bit, is the maf buggered when its unplugged whilst the engine is running & it stalls or is it the other way round? can remember checking this on a old turbo car years ago

I have the same problem, there is a cough at about 4k, then it shoots up to the redline, I have a 1995 wrx. If you search, a few people have or have had the same problem, including robsw and Scott T. Nobody seems to have found the answer, maybe an ecu bug?

i have got this same problem!!!!!!!!!!!!!!!!!!!!!!!!!:confused:

done an ecu check and it comes back with
error code 45 (pressure sensor/pressure exchange solenoid valve),

i have checked both sesors with a multi meter and a vacuume pump but they are both fine...i am going to check the ecu and the electrical harness some time this week will post an other tread if i get any results.....

it might help you shed some light on the situation,,,it might not

think im going to clean the boost solenoid out today ive done this before but not cleaned through all the hoses attatched to it then this week ill get some new spark plugs cause looks like the previous owner had them fitted at a garage so maybe not gapped propperly or crap plugs, a friend has a l reg wrx same mods apart from the ecu & his is so responsive so comparing mine & theres something not right. when you do the ecu check does it come up with the codes straight away i did a ecu reset the other week when i changed fuels & flashed equal after 2 mins of driving which is ok but when i fitted the new ecu yesterday & a decat middle section i reset the ecu again & it seem to come up with a problem code only after fitting these mods though & 2 minutes of driving