Need Help With R32 Gtr Idle And Reving Problems

[princess_camii]

Hi my brother has a problem with his R32 GTR 89 model...

This is his message...:

The problem is when I start it revs up to 1200 rpm then drops to 1000 rpm, after warmed up sometimes it will fall too zero and pop up again to 1000 then engine dies.

Also as i'm driving along doing 60k or under I try to accelerate but it wont let me and start dereving by it self... I try to put it a lower gear eg. second but it will only rev up to 3000rpm and start cutting out. So I basically have to pull over and turn off the car and then restart the car and sometimes it works.

I have changed, oil, spark plugs, checked coil packs, just changes fuel pump to Walbro gss341 but still not working correctly by not letting me rev.

If anyone has had this problem or can give some advice on where to look it will be most appreciated.

Thank You

[GeeTR]

This is his message...:

Sooo mysterious

Maybe idle control valve, or AFM, and the not wanting to rev, sounds kinda "Nissan: sensor dropped out / stopped working, induce rev cut mode"

Has your brother checked for error codes from the ECU?

Cheers

[hanyou]

air flow meter dude

[RipNGrip]

run a ECU self-diag! takes seconds and any idiot can read it! well if u know how! PM if u don't konw how to do it

[princess_camii]

Thank you all for the info and Yes it was one of the AFM playing up now change and works fine

Cheers