BNR32 Idle problems

[Amaru]

Hi all,

I seem to be having some idle problems with my car, its a 1992 R32 GTR and I cant seem to find out what.

Basically any time im slowing down to a stop, the idle drops to around 600rpm, sounds like its about to die, all the electrics dim quickly, and then it slowly scavanges around to find the right idle (it normally idles at just under 1000rpm so when i slow down it does 600rpm -> 700rpm -> 600rpm -> 800rpm -> 700rpm -> 900rpm -> 800rpm -> 1000rpm). It also occasionally stalls if it cant pull the idle back up.

This only started happening after I didnt drive the car for 3 days straight (it usually gets started every second day at least).

The car has a power fc, and in the sensor checks it reports one of the 02 sensors as being 0.02v (dead) but it has always been like this, and nothing has changed in the period of time before it was running fine, and after it started playing up.

Any ideas/feedback would be appreciated.

[unwritten law]

Atmo BOV???

[krzysiu]

It can be an atmo BOV as unwritten law said. My car has idle problems but i know its normal because it is heavily modified. Sometimes the car is already at idle and then the RPM just goes up and down up and down, and the internal lights dim. Hate when it does that but every mechanic ive seen, they say it it becasue of the Modifications. I know this might sound stupid, but try to reset your computer.

[Amaru]

Well the car has had atmo bov's (blitz supersonic dd's) since I bought it, and it used to run fine without a problem... just in that weekend something seems to have changed, and its never run properly on decelleration since...

[DAN00H]

Nik

Sounds to me like a vacuum leak - I have the same thing on my NA d/driver. (it has vac leaks, but I don't like working on it!!)

Check all of the emission lines (one might be cracked, or could have been knocked off). If that doesn't locate anything I'll think about it some more and tell you my ideas on Satuday : )

Cheers

Dan

(BTW - no car should 'hunt' at low idle, if a car is very worked it will be lumpy, but not hunt - I grew up with angry V8's

[Morgs]

Amaru, I've had the same problem for a couple of weeks, well similar perhaps.

Does it run alright top end?

[Amaru]

Yeah it runs fine accelerating and top end (it feels a bit choked top end but im putting that down to my exhaust which is being replaced saturday) just as DAN00H said, hunts for idle when i come to a stop. Vacuum according to the AVC-R seems to be ok, and it doesnt jump around alot when off throttle of stopped, but I will check all vacuum lines etc this weekend.

[MANWHOR3]

what i've found from experience is several factors:

atmo bov failing - it might have been alright before, but as it gets older, it may be leaking

weak fuel pump and almost empty tank - just before my fuel pump died, it seemed to have trouble sucking enough fuel when the tank is empty (very little downpressure)

[Sumo]

have you made sure its charging properly.... should be at around 14.1-14.6 Volts.

Sumo

[Morgs]

My problem was BOVs leaking

[Guest two.06l]

My problem was BOVs leaking

the prob is electrical check batt and level in it also afm voltage in sensor check screen on power fc.i have a question how does a air leak make lights dim,come on guys have a think about it........