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R33 Running Rough Only When Cold, Under Load

jgtoranalc
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jgtoranalc Newbie

jgtoranalc

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Posted (edited)

R33 GTST Series 2

Splitfire Coilpacks
660cc injectors
Fully adjustable Coilovers
Nistuned
Turbo Timer
Bosch z32 AFM
Gready Front Mount Intercooler
Boost Gauge
Boost Tee - Set to 13psi
Problems I am having is every time I start the vehicle when the motor is cold, it runs rough only when I'm accelerating and then once it is at normal operating temperature, it's fine to drive. Sometimes I will turn it off after a long drive (at normal operating temperature) then start car again and the Idle goes pretty high (can't say what to as tacho is inop.) It's like it thinks it's cold and putting more fuel in.
I replaced the spark plugs and they were all black.
When the motor was running, I removed a coil at a time but couldn't tell any difference as the problem only happens when motor under load.
I bought this car roughly 1 month ago and previous owner didn't tell me about this problem....very sneaky but got it cheaper than what he had the original price at.
Where do I go from here? What is the next thing to look at? Could it be simple as the tune not setup right.
Edited by jgtoranalc
admS15 Grand Master

admS15

Posted
Posted

I have heard that nistune can be problematic on 33's. I wonder if that could be your issue. Your best course of action will be to get a tuner with nistune experience to take a look at it and see what's going on. Hopefully just needs a slight tweak.

  • 4 weeks later...
jgtoranalc Newbie

jgtoranalc

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I thought I'd update this thread for future use.

I did send my car to a tuner and they fixed the problem. No cold start issue anymore, they said it was running too lean, adjusted a few things, also checked the timing and idle too.

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