Rb25det

[D1_5PEC]

my car is giving me nightmares!!! no one can fix the bucket of shit...it will not pull on boost it just breaks down and has a shit fit and wen u clutch it it goes into limp mode,but in the wet it arcs up fine...wont rev over 5500 rpm and i need help bad!! could this be a faulty knock sensor or somthing?

[blind_elk]

Have you checked ignition timing? Have you checked fuel pressure (dying pump)?

[Amec]

would help to know what has been tried to fix the problem so we can suggest possible solutions.

[D1_5PEC]

well the car has one of them aftermarket plenum and it was not sealed properly so it got removed and powdercoated and then put bak on and this upset the power fc and it will not run the car anymore.so it has a stock ecu running the car now.it has new coil packs and plugs i have a bosh pump but its not yet in the car.

[and3_3]

Has it been maintained well? Is it blowing smoke? Is the oil pressure ok? Need much more info dude.

[donut_kng]

if it was a stocker id say def coil packs.. could still be the case but obviously the thing has been played with so maybe something else..

if it arcs up in the wet it might be because your not loading the car up therfore not as much boost getting pumped through it hense not shitting itself.. thats what makes me think coilpacks

[tridentt150v]

Why would changing your plenum upset the tune on your pfc any more than on a std ecu??

I'd be going back to the pfc and getting a proper tune.

[Habler]

Take it to Phil at Geelong Tune-Up Specialist (03) 5241 6655. He will sort it out.

[D1_5PEC]

its been to geelong tuneups before i bought it...looks like its goin bak lol umm the plenum wasent sealed properly in the first place thats why the power fc has a bad tune to counter airleaks and so on...this is the information that has been handed on to me as i know f*k all about jap cars.the car has new coil packs in it and does blow a lil blackish smoke on idle.

[Bennett]

If the power fc was tuned to counter airleaks and now you have a plenum with no leaks, then a re-tune will fix your problems. Also black smoke is ok, just means the tune is a bit rich, probably stuffed from when you changed the plenum. I recently cracked my intercooler and now it leaks which stuffed my tune the same as yours. Now it blows black smoke too cos its running rich. Its blue smoke that you want to look out for, blue is never good.

Hope that made sense. Good luck with the car mate

[D1_5PEC]

[yeah thanks mate just a question tho,shouldent the standerd ecu make the car run smoothly?? there awsum cars but one little thing upsets them bad its a pissoff lol

[Bennett]

Yeah i guess it should but im not really a fan of stock tunes so i would still suggest a re-tune of the power fc. You may be surprised how many problems a good tune can fix. Also could have something else wrong with the car such as coilpacks or old sparkplugs which are the usual suspects for making rb25's run like shit.

[tridentt150v]

if its a standard car then a std ecu will work just fine..........if you have a forward facing plenum, a fmic, and/or turbo, injectors, pods, etc etc then a std ecu can't help you. The pfc is a tunable ecu, it is your best option.