KA24DET RPM Trouble

[Apollo8642]

First thing I'm running a stock maf, 550cc injectors, and I have a 7lb spring on my wastegate but this isn't a boost issue I'm pretty sure.

The first problem when I turn the car on it revs by it's self right up to 2000 rpms then drops down to about 800 rpms.

The second, when driving after it gets warm, I'll drive normally then let off the gas, and then put in the clutch in, the rpms will stay up in around 2000 grand for about 30 to 45 seconds before dropping down where is should be, Could any one shine any light on this thanks.

[skylinegtrhr]

Is Yours speed sensor OK ?
Also what is position of AFM vs. turbo?
What part of map is ECU reading when this is happening?

[Apollo8642]

Speed sensor is fine.
What do you mean by what is the position of AFM vs. Turbo? My air fuel mix is usually high 13's low to mid 14's when this happens, I'm running a big turbo so I have turbo lag for days if I keep my foot out of it.
Not sure my nistune has been all jacked up with issues till today so I'm goin to see about getting a log of it. I'm thinking it might be either is screw up in my tune or something sensor based like thottle position sensor, or my maf, I just haven't been able to nail it down

[Matt]

Can you get a log of the issue and post here?

What are the AFRs like when its cutting out at 2000rpm? Sounds like it might be leaning out. RPM limiter with no speed sender is about 4500rpm or similar, so this is a different issue

[Apollo8642]

lets see how screwed up I have things here's a log.