HELP: R33 playing up, Fuel Problem URGENT

[Eav00l]

Hi all.

This is really weird issue.

Abouty 3 weeks ago i put in a Power FC, took it to MRC in C'Hill to check the tune and make sure its ok to run, Mark @ MRC did a bit of paying around as it was running to lean, put an extra 15%fuel in per injector.

Then it drove like a dream, i drove it from my house in Baulkham hills to the snow in Jindabyne, no issues what so ever, got back no issues.

But a few days ago i was driving along and the car started to run a bit rough and the idle went down to around 400rpm and then sometimes stall, the turbo would normally sity on 500mg (vacum) but when it playes up would sit on 0 boost.

This only seems to happen when the car warms up a bit and does jnot happen all the time, only sometimes.

When it does play up there is alot of black smoke out from the exhaust, and inside the engine bay it stinks of fuel.

I 1st assumed it was bad fuel so i ran the tak to almost empty fill up with Optimax again, seemed to fix it untill i was almost home and it did it again.

i have a few idea's it might be but i really have no idea

maybe Fuel filter blocked?

Injectors blocked?

The ECU Tune?

I have to fix this asap so any help will be great, BTW if it is a ECU issue and you know anything about Power Fc's can you give detailed instructions on how to resolve it.

Thanks Guys

I might have to put the old ECU back in but i dont really want to.

Craig

[rb25]

I'm pretty sure its a fuel pressure problem, too much pressure at the rail, and im guessing your using the stock regulator?

I think maybe the FPR isnt returning excess fuel back to the system, or that return system is blocked. This could have busted a fuel line or making the injectors leak from excess pressure. Reason being is the fuel smell in the engine bay, the 0psi reading at idle and the black smoke indicating rich running (i.e. over-fuelling).

Another thing that comes to mind is a simple thing: a broken vac/boost line to the FPR? This will run the rail at full pressure, even at idle doing bad things to your injectors. or a broken boost/vac or fuel line elsewhere in the engine. Check that fuel filter too.

Hope that helps.

-rb25

[Eav00l]

thanks mate ill look into it.

i did notice a vacum leak somewhere

[sidewaymambo]

first thing first, did you check the AFM plug, or whatever it sliced with the afm wire harness? connection maybe lost..

I had same thing happen to me, I though was spark plug, anf replace them with other, and no help, until I discovered the connection of the AFM was lossen, put it back , everything back to normal..so I assume the connection of afm or somewhere is loosen.

[Eav00l]

ill check that out.

ive done a bit of testing, i put the stock ECU back in and it hasnt done it yet.ive got a bit more drving to do and ill get back to ya

[Eav00l]

ok it still does it with the stock ecu, i fiddled with the AFM plug and it seemed to fix it. hmmmmmm the plot thickens

[Eav00l]

any one else got any idea's

[Eav00l]

ok found the problem,

took the AFM off, and it was filled with Oil, the front oil seal of my turbo has cracked

time for a new turbo