2JZ- GTE won't start when warm!! HELP!!!

[Hengsta]

Measured the oxy sensor today. Seems to be working fine! .3 - .8volts max on the mutimeter when warm!

So guess that's not the case then!

Got no idea what else it can be. Just want to fuck off the ecu and go for a haltech or some sort. But don't have the money at the moment!

[punkture]

Mate sounds like your water temp sensor, had similar
Issue on mine

[Hengsta]

That's strange cause I know someone had same issue but on a 1J were it didn't start!

But im sure I'm water temp is working!

[punkture]

You have two sensors usually, dash and water temp for ecu, (I'm going off 3sgte and 4agze) my 4a had this issue would even foul plugs because of it check the resistance when cold champ

[punkture]

In short the water temp sensor richens the mixture depending on coolant temp

[Hengsta]

Changed water temp sensor today!! still the same??

[allencr]

Now what does that come down to?

I've assumed that it's just leaking injectors & unburned fuel from its last shutdown, and always hold the throttle open on carbed & EFI engines.
Don't get carried away, don't sweat the small stuff.

If it's got a cold start injector, disconnecting will verify that it isn't contributing anything.

[Hengsta]

New o-rings on them when I got them cleaned and flow tested.

Could it be no fuel pressure in fuel rail?!?! Cause my pump dosent do the pre pump thing when key is on ignition. Only gets power when engine cranks. But then again I don't see this could cause it when it only won't start when warm. Will start first time everytime in the morning!

[punkture]

Hmm on my ecu my check engine light wire was cut, check that for the attempt to get the codes, but is the 2j map it afm?