Hot Idle Problems

[EFI_fixer]

Hi guys Jared here,

Finally got my R33 about a month ago so you will probably be seeing more of me now i do. First I've got a question for every one.

Has anyone ever had trouble with their R33 starting & idling when it's hot? I first came across this problem about a week ago when I had been driving for long enough for the engine to warm right up, went to start it a while later & it was a bit reluctant, gave the throttle a touch & away it went. Since then it has become worse & it seems to be really difficult on a hot day like yesterday if you go to start it 5 to 20 minutes after it was last used. I have to give the throttle a good prod to get it going & then hold it open a tiny bit for about another 5 to 10 seconds before it stablises. If I shut it off & go to start again straight away, no problem. Equally if I start it cold i don't need to touch a thing, so I'm thinking heat-soak may be inducing the problem. The only other time it has cut out was yesterday after a 2km hill climb & it stalled when i pulled up at the top to turn off.

I have a hunch that it may be the idle air control valve either shorting out, or going open circuit & once it gets a little bit of cooler intake air it starts working again. I did also change the coolant last weekend but I checked the air bleeder this morning & it was filled to the top with coolant. It still goes as hard as usual though when the problem occurs.

It would be appreciated if anyone can either confirm this as being a problem or give an alternative.

[leech_]

yea mine does a similar thing i know of others complaining about cold starts giving dodgy idle but mine is perfect at cold but if i take it for a long drive turn it off for 15 - 25 minutes then start her up again on a hot day i give it a bit of a rev and as soon as it trys to go back down to base idle it almost stalls by dropping to about 300rpm so yea any advise would be appreciated by me too

[Col-GTSX]

WOW... i picked mine up on tuesday last week and its going back tommorrow to be fixed (warranty)... So ill let u know what it was... I believe its the IAC or long shot the AFM...

Probablly the IAC as it stutters at idle sometimes...