R33 Idle Help Please!

[Michael_1882]

Hi guys, after my car is warmed up, if i stop at traffic lights or jsut stop, and let the car idle it will sit at abtou 600-700 then a tad later will drop down to like 400 and nearly stall (at night the lights dim right down) then in order not to stall it reves up high to over 1k then settles back at 600 where it sits for about 5-10seconds and repeates the cycle again. Some one said it could be an AFM fault or somthing???? I'm jsut after you expericences/oppinions and simple tests i can do in order to fix this problem.

Michael

[BH_SLO32]

Michael,

I diagnosed a similar problem on my brother-in-laws R32 and it turned out to be the non-factory O2 sensor. I would suggest next time the idle starts to drop disconnect the O2 sensor and see if the idle rises again. This was a very frustrating problem that took no end of time to find thanks to its intermittent nature and every time I wanted it to play up it didn't - typical!

Hope this helps.

Cheers

[RANDY]

Interesting... about the closed-loop idea. If the O2 sensor is really stuffed, then it is leaning it out too far?

I'd still check the MAF though, and give it a good clean with contact-cleaner (aerosol in a can)

Then, give a consult program a little look, and see what the MAF and O2 is doing when it almost stalls.

[lexbomb]

do you have an aftermarket BOV

[Michael_1882]

Yes it does have an after market BOV on it now, but these promeblems happened b4 i installed it.

Michael

[mic087]

yeah myne was doin the same...ended up bein air escaping from an aftermarket BOV...but if it was happeneing b4 u got the BOV who knows..