R32 Revs By Itself

[Souljahx]

Hey

Well i have in general... a problem... as alot of ppl do but shouldnt... so if anyone can help me would be much appreciated...

Its an R32 Skyline GTST .... Ok... so i just had my car in to a place called APC in springwood... i got my timing belt done, all the other belts at the front done, new spark plugs, injector flush, throttle body cleaned, new fuel pump, dyno'd etc....

has been all good for about 2 weeks... until now...

i was driving along 2 nights ago and just all of a sudden the revs started dying, and then it picked up... then they started to die again... and way kept my fooot on the gas while it was doing it and the whole car just started to stop go stop go stop go... like shaking... so i pulled over... and the engine conked out... so im like WTF?

start her up and she was fine for about 2 or 3 minutes... then it did it again and again... and then i pulled up at a set of lights and the idle had a mind of its own... revving till about 2000 / 2500 RPM then going to idle, reving idle reving idle just reving by itself...

so like i pull over and turn the bitch off... and wait a minute,.. and turn it back on... and its fine... for another few minutes...

so u could say its hunting i spose... i think thats the term u use for when it revs on its own....

and it doesnt do it at all when its cold or just warmed up... more or less after its been for a drive for more then 10 or 15 mins...

kinda weird.... i was thinkin 02 sensor.... or TPS.... or idle speed motor... or a vacuum leak somewhere...

maybe someone can narrow it down for me or tell me where these things are and what to do to check them out

Thanks heaps guys

-Josh

[race_snooze]

most likely your o2, check the plugs to it. See if they are clean and what not.

[lows_13]

Easy way to check if its your O2 sensor is to dis-connect it, the ECU will revert back to a

rich fuel map. Or you can perform an O2 sensor test via the rear of the ECU, if you have a little

red light on the back of it.

[SKY 34]

huumm actually this happens to my car as well now...but more severe, it's getting very consistent...on my post ppl suggest intercooler pipe leak, clean afm..I clean the afm still same thing happened...checking in workshop on Monday...I'll keep you posted...do tell me if you figure out what is wrong as well

[blind_elk]

How old is the fuel filter?

[hayden49]

Look up "cleaning your AAC valve" in DIY, fixed my problems.

[Souljahx]

yeah the fuel filter isnt that old either... maybe like 10 mnths old or something? but fuel pump was just done... and it was on the dyno... and i only fill up using vortex 98 or shell v-power.... so i dont think i would have got a bad batch of fuel... ok has anyone got an engine manual or e book on the RB20DET... im not completely null minded of engines etc but i honestly dont know where the aac valve is.... or the 02 sensor... unless your talkin about the one under the car on the exhaust system? and i assume your talking about the ECU behind the dash?

yeah no problem dude... ill let you know of any progresses

[Chegs]

hey mate, have you tried resoldering the joints inside the afm or just cleaned the plug out with contact cleaner? i spent a thousand bucks chasing a missfire/idle prob and i eventually fixed it myself for nuthin. pulled the afm apart and resoldered the joints inside. runs perfect now.

[lows_13]

I've also done the re-solder of the AFM connections, fixed the problem

[Souljahx]

yeahhh i had a mate of a mate come over and reset the error codes on the computer which was air flow meter

so i got a can of carby clean and tightened the pins in the connector and i sprayed the crap out of the little square element inside the air flow meter and runs great now

cheap fix

anyone know antything about if its worth getting bigger air flow meter... say like the Q90 from a 300ZX i think it is... and i think theres a bigger one again?