Hunting Revs - Misfire

[JiN_MaN]

Hey guys, so the R32 GTR is:

Moving all over the rev range

Stalls if you dont give it some revs

Smells like fuel, running rich

Things Ive done but will try again,

Plugs

Coilpacks

Ignitor

Can dead AMF's or o2 sensors do this?

Does anybody have other suggestions, im unfamiliar with RB26's

Thanks in advance

Edited September 5, 2009 by JiN_MaN

[89CAL]

atmo bov? might be causing it, that would be the most obvious thing if you have one

if your car has a stock ECU try resetting it, might help

[Moodles2]

Check all pipes, you might have blown a intercooler pipe off.

[shaunzo101]

should try a known working afm?

[JiN_MaN]

atmo bov? might be causing it, that would be the most obvious thing if you have one

if your car has a stock ECU try resetting it, might help

Standard BOV and ECU has been reset a number of times

Check all pipes, you might have blown a intercooler pipe off.

Been over all of them.

should try a known working afm?

Wish I could get my hands on some easily. Would faulty AFM's fit the problem?

[Moodles2]

Really need a consult device plugged in, should be getting about 1v at idle on each AFM.. I can't see O2 sensors as the culprit, as the ECU runs closed loop while the engine is warming up.

Could be a intake manifold leak, If you have a spray that is alcohol based like brake cleaner or aerostart (WD40 should be suitable too) just spray it around the throttle body gaskets and the intake manifold gasket, if the engine responds then you've got a leak there.

How long have you had the car? and when did this start happening, was it something you did mechanically or someone that developed on its own?

[JiN_MaN]

Really need a consult device plugged in, should be getting about 1v at idle on each AFM.. I can't see O2 sensors as the culprit, as the ECU runs closed loop while the engine is warming up.

Could be a intake manifold leak, If you have a spray that is alcohol based like brake cleaner or aerostart (WD40 should be suitable too) just spray it around the throttle body gaskets and the intake manifold gasket, if the engine responds then you've got a leak there.

How long have you had the car? and when did this start happening, was it something you did mechanically or someone that developed on its own?

AFM Voltage varies from 1-1.7V as revs quickly change from 950rpm to about 1800rpm. The AFM voltage is not stable at all and is all over the place.

I gave it a spray and I swear it did it once, but hard to tell if it was just the car reving on its own or actually sucking in through a leak.

Ran and drove the car in Japan, idled fine no real issues. Got it home and its been doing it ever since

Edited September 5, 2009 by JiN_MaN

[JiN_MaN]

Took the AFMs out and gave them a good clean with come AFM cleaner. Car has come slightly better and now idles on its own (just), it was defiantly part of the problem, but still hunts revs from about 1800rpm down to 950rpm but doesnt stall. It does this like clock work, consistently up and down.