2006 Yaris Cold Start problems

[B.B._07]

First of all get the codes scanned, they'll point you in the right direction. Check that you have spark, and the condition of the ignition coils. Also check that you're getting fuel, so check the fuel pump primes and runs, and that you're getting good fuel pressure.

[cerberii]

Originally Posted by B.B._07

First of all get the codes scanned, they'll point you in the right direction. Check that you have spark, and the condition of the ignition coils. Also check that you're getting fuel, so check the fuel pump primes and runs, and that you're getting good fuel pressure.

theres no codes because there is no check engine light. I reset the computer and theres no check engine. This is something that is not throwing a code. I got it to throw a code by disconnecting the MAF while running, but that was just because I removed the MAF, so it recorded the code and displayed the check engine light. After reset it was fine and no check engine, no code then?

everything runs great when its warm. Its just the cold start. Starting cold it will go to 1000rpm then down to 500 and then a few minutes later sputter and die. Before cleaning the MAF/PVC and restarting the computer it went to 1000 and then just died ( upon cold start).

Just replaced air filter and spark plugs as well right now, on cold start it still will idle too low and then sputter and die. Im thinking this could be the ICU in the throttle body, and maybe needs to be cleaned?