Rough idle cold start 93 jdm 2jzgte

[Twin turbo]

Hi having problem with a rough idle that only last a few seconds right after startup when the engine is cold.

Sometimes there is a short hesitation also when engine got normal temperature.

Have changed all coilpacks and sparkplugs,old ones turned out to be fine.timing belt and water temp sensor also changed.Replaced with a new Fuel filter and mecanic told fuel pressure was fine.Also noticed that when temperature is above 26 degrees outside it most of the time start up fine without any issue when engine is cold:confused:

The car has gone less than 30000km so all cables and hoses seems fine.I do not hear any buzz sound from fuel pump when i put the ignition on only some click,is this normal or could one of the fuel pumps have a intermitent problem.

The car is not my daily drive so i dont now if that has something to do with it,thinking about fuel returning to tank.Got seldom more than Half tank to prevent old fuel.have not looked at all those sensors but could not find any error codes thru obd.

Edited September 9, 2016 by Twin turbo (see edit history)

[Twin turbo]

Rough idle problem finally solved.It was one leaking cap in engine ecu

Only problem now is that toyota tells me jdm automatic ecu 89661-14491is out of stock

[Mike2JZ]

I think I have one spare if you can't find any

[Twin turbo]

Thats great,do you know the condition of your ecu.I only ask because my only consern is that a lot of them has already start leaking making them unrepairable even before symptoms starts.I got another ecu that is working for now and thinking about open it to see if it is good for remanufacturing.But i am interested,how much do you want for yours:)

Edited June 16, 2017 by Twin turbo (see edit history)