ok ive just bought a 95 wrx, when i hit 4500rpm exactly the car feels like its hit the rev limiter and wont rev any further, I did the ecu reset and it seemed fine but then after a 20mile journey just steady away not using the turbo a lot on the way back it started doing it again. What could it be? the car has a forge dump valve on which ive been told it needs to be a twin diaphram and this could be causing the problem with boost leak.
Any ideas please!!!!!!!!!
cheers simon

 

I know im only new on the site but it would be nice if someone would reply!!!! I cant be the only one who's had this?
cheers simon

 

Sounds like you're in limp home mode, is the check engine light on?

 

no the check light isnt on car goes like stink up to 4500rpm then doesntwant to go any further, ecu reset sorted it but then some sort of sensor problem triggered it off again, what could it be?

 

def'n is limp mode M8..maybe they took the light out of the cluster for the CEL...!!

 

lol, yeah, seen that done before, light should come on when you switch ignition on, then go out when started. If it does'nt come on with ign, the bulb has prob been robbed. In which case previous owner has been a bit devious.

Which sensor set problem off, sounds like you just answered you're own question, do a diagnostic check to find which sensor is at fault, then renew it.

 

the check engine light comes on with the ignition but doesnt do anything when i plug the black plugs together. Im hopefully getting it checked out with a snap on fault code reader guy reckons £20 to give it a go.

cheers simon

 

what speed you you doing when it does this ???

 

doesnt make any difference what speed or gear just 4500rpm

 

have u checked coil packs? if u have one or more breaking down then that is the sort of rev range u will notice it. (between 4k-5k is where maximum torque is developed) i had similar problem. worth taking each coilpack out, pulling off the rubber boot and checking for any cracks. even hairline cracks can cause it to happen.

just an idea!!

 

Whats it boosting up to ?

 

not tried taking out the coil packs isnt it a pretty big job taking out air box battery etc, didnt do it for 20 odd miles just after it was turned off. A for boost its getting to .75 bar which is about right isnt it?

cheers simon

 

just airbox and wiper tank needs to be removed to get at the coilpacks and plugs.

Pretty sure there are green plugs for checking the CEL - maybe review the CEL checking process or take it in. There definently should be a code.

 

black plugs for check and green for reset just done a check on mine no cel light but was cutting out at 4500 rpm (or around there) and it came up as code fault 45?

 

thats sounds exactly the same as mine, code 45 is

Pressure sensor –Pressure exchange solenoid valve

what is that then? could it be to do with the dump valve or overboost mine only boosts to .75bar and does it when not under load.
cheers simon