R33 Gtr Struggles To Make Power

[azamataz]

Lately after driving my GTR for about 30mins it will start to loose a lot of power. The best way of describing it is that no boost comes on, however the guage is still reading positive boost. Also when it happens i use a lot more fuel up and theres alot of poping goin on from running to rich.

The car is still standard, running standard boost. I checked the ecu to see if i could get any error codes however it doesnt have any led's. how do i do this on an r33 gtr?

Im thinking the computer is running the car rich and retarded for some reason, maybe the afm's or coils. does anyone know what this could be

thanks for any help

[chrissso]

Sounds like spark plugs. When there buggered, they don;t work properlly when hot. Has it been a while since you changed them?

Good place to start anyway...

[azamataz]

yeh spark plugs were my first thought, I changed them on the weekend from PFR6A-11 to BKR7E-08. but unfortunitly its still doing it.

[Noy]

mate my 33 gtr was doing the same thing changed a few things plugs.afm was still doing it so i replaced the computer with an aftermarket item now runs like a dream don't need my afm's woo hoo so maybe i'm guessing faulty ecu.

[azamataz]

yeh ive thought about changing the computer to an aftermarket but id rather iron out the problem first. knowing my luck the new computer would just hide the problem and itd come back to bite me on the ass

[wrxhoon]

My bet is its overboosting , then the ecu cuts boost to about 7 psi so it feel gutless . How much boost are you running usualy? does it go to the end of the stock gauge ? When it feels gutless does it only go to half way ?

[azamataz]

its still running standard boost, i know it goes over half way on the stock boost guage but dont know how far itll go as i dont realy want to push it when its doing it.

[blind_elk]

My bet is the fuel pump is dying, the popping is actually running lean, and the loss of power is knock sensors retarding timing.

[azamataz]

If Its the fuel pump how come im useing a lot more fuel? what are the signs of fuel pumps going?

[bilbo117]

sorry to hijack the thread... but does a popping noise while backing off after being into it mean the car is running lean?

[azamataz]

i thought it meant it was running rich. The 'pop' sound is usually excess fuel being burnt