Help! check engine light alwasy come up in cold

[2JZDU]

Originally Posted by pwpanas

1) The garage you took it to sucks. If the check-engine linght comes on, there will be a code stored in your ecu.
2) What you've described seems to be a tough problem to diagnose. Perhaps a sticking idle-air control valve?

I'd suggest starting by reading your own codes:
http://www.mkiv.com/techarticles/eng...bd1_codes.html
http://www.mkiv.com/techarticles/eng...bd2_codes.html

I'd suggest you should also check for boost/vacuum leaks by pressurizing your charge-air system.

Tnak you, I will try to diganostic by my self.

another problem is, I started the car at afternoon, everything are nonrmal, no engine light, boost and rev are fine...this is completey doesn't make sense

does the car like to stay under sunshine????