Cold running

[blind_elk]

Here's the rub.

When the engine (RB20DET) is cold, and you're driving along very gently, then suddenly the engine goes into premature labour. Its like someone's standing on the brakes.

Either put up with it for a few seconds and it clears itself, or change the throttle position, and it goes away for a short time. It might do this perhaps 10 - 20 times until the engine fully warms up.

Once the engine is fully warmed up, it doesn't seem to do it any more. Although it could be that I'm driving it a bit harder by then.

It seemed to be also related to throttle postion - more throttle could clear it for a while - , so I changed to a spare TPS, but this morning it still did it.

Often it happens at around the 2500 rpm, which suggests the AFM.

So, what I'm after is for someone who has a known good AFM to swap with me for a few days so that I can confrim / rule out the AFM as the cause of this bloody annoyance.

Please PM me if you can help out.

Thanks

[2rismo]

Could be something as simple as a fuel filter, dude. I'd try this first. Seriously.

Adrian

[Ait]

Got the same problem! I just drive it gently till the needle goes to the warmed up position. I have a feeling it's the fuel mixtures at start up? But try the AFM method too.

[JL]

Hi guys,

I get the same thing when the car is cold. I agree with Ait when he says its the fuel mixtures on start up. It goes away after a couple of mins when the car starts to warm up. If it was a real problem I dont think it would just stop when the car is warm. I could be wrong but thats all i think it is.

Good luck with it anyway,

Cheers

Jamie

PS let me know if you find a way to stop it!!!

[Guest ylwgtr]

sounds like a lean fuel mixture

[blind_elk]

2rismo,

its a relatively new filter.

all you other guys,

I figure its mixture related, but why?. It shouldn't do it at all.

There's a distinct change in the note of what I think is the air induction when these episodes hit. Its bloody annoying when you're halfway out into the main road and the power just dies under your foot. Then you end up almost 'kangarooing' as it cuts in and out.

[blind_elk]

Well, I may have partially solved the problem.

I replaced the adjustable cam gear (never had it properly set up) with the factory wheel. Engine didn't misbehave nearly as badly this morning, but there was still a slight problem present.

I am getting a brand new second hand AFM soon, so I'll see if that eliminates the problem.

[dAVE]

Have the same problem with my 33. If i warm it up for 5-10 before driving i dont have it , but when im in a hurry and drive cold its a bitch. I also have the dead power feeling and also the change in air induction. I have learnt to drive without it happening.. (change gears before 2k ).

I have always felt that it was floding the engine with fuel almost, but not knowing much about how engines work etc, i really have no idea.

[JET-33]

lose injector? maybe

[chopobo]

is this why i get this fuel smell in the cabin sometimes?

[blind_elk]

Well, may have spoken too soon. Last night and this morning - same crap.

Stumped if I can work out what's happening. I did have a problem where the A/C clutch would engage all by itself - maybe that's still happening, it would certainly load up the engine.