1JZGTE not idling properly.

[ZZT231]

Hello All,

The engine idles constantly high and then dies but does not stop, it idles high again.

[ndgcpr]

clean ISCV maybe? there have been a few threads about 1JZ's ideling

[ZZT231]

We were hoping it wasn't that, but doesn't matter, we are pulling it out as we speak...

Cheers.

[ZZT231]

With a cold engine, should the ISCV be open or shut?

[chris davey]

Open I would think. Cold engine needs more air to idle so open ISCV will let the air in.

[CrUZida]

ISCV should reset to open when you turn car off

[GZP51]

how did you go? did you get the iscv cleaned? it is almost impossible to clean them totally as on the 1j's the bastard things do not come apart (ie solenoid from valve) like on other motors. hope it is all good now and or good luck
matt

[ZZT231]

We took the ICSV out and cleaned it... it doesn't even move when the ignition is turned on... So it's stuffed , we pulled it appart and turned it a few times so it's the opposite to what it was originally, the car idles lower...

But with a AUD$850 price tag for a replacement unit... I think I better live with what I have...

Cheers.

[wilbo666]

But with a AUD$850 price tag for a replacement unit... I think I better live with what I have...

Cheers.

Dude...I'm pretty sure someone will have a secondhand one floating around...

At any rate, I suggest that you read the TRSM for the 2JZ-GTE (I'm not sure if the bits that are around cover the ICVS, if not you could also look at the TSRM 7M-GTE MA70, but I am not sure if the 1JZ ICVS is the same wiring/design wise from memory).

I sugest that you follow the TRSM check procedure, which involves (from memory) checking that the stepper motor windings are OK resistance wise and then attempting to step the motor through manual. Have you checked for power at the ICVS?

You may have a simple wiring issue, the ICVS should be powered off the M-REL circuit which is a switched relay via the ECU. The ECU gives power to the ICVS for a few moments after the engine is turned off so that the ICVS can be fully opened for when the engine starts next time...

A few things to check

Cheers
Wilbo

[ZZT231]

A mate tried to manually step the motor and it didn't react so it's stuffed...
The ECU is getting it's main power from an alternate source which power is flowing constantly.

Being frustrated that the car was idling too high, my mate pulled the thing appart and screwed it the opposite direction and put it back together (without the spring pin) and currently the car idles very low but enough to cry as now I have 2 blown turbos...

[mrshin]

I've probably got one kicking around a pile of junk somewhere here...

[wilbo666]

A mate tried to manually step the motor and it didn't react so it's stuffed...
The ECU is getting it's main power from an alternate source which power is flowing constantly.

All well and good, but the constant ECU power source is very different to what I was talking about...re-read what I have said, the ICVS, it gets power from a different circuit to the ECU, it is however switched via the ECU. I am assuming that you checked for power at anyrate

Being frustrated that the car was idling too high, my mate pulled the thing apart and screwed it the opposite direction and put it back together (without the spring pin) and currently the car idles very low but enough to cry as now I have 2 blown turbos...

Blow turbos? What are the symptoms? It is very unlikely to blow two turbos, as soon as one goes the other will just blow through the remaining one...

When you took the ICVS off did you make sure to put the one way valve (black, round, rubber section with little flaps) that is in between the ICVS and the plenum back in, and also in the right way?

Otherwise I guess you can drop the exhaust Y piece off and check the turbos (and yep, I've been there)...

Cheers
Wilbo

[ZZT231]

Blow turbos? What are the symptoms? It is very unlikely to blow two turbos, as soon as one goes the other will just blow through the remaining one...

When you took the ICVS off did you make sure to put the one way valve (black, round, rubber section with little flaps) that is in between the ICVS and the plenum back in, and also in the right way?

Otherwise I guess you can drop the exhaust Y piece off and check the turbos (and yep, I've been there)...

Cheers
Wilbo

After a whole day getting it off I've found1 blown turbo with heaps of shaft play and oil and the 2nd one is starting to show some symptoms of failing and starting to have some shaft play.

Thanks

The ISCV is stuffed and the one way valve didn't fall out

[mrshin]

I might even be able to help with a replacement for the stuffed turbo if you need one...

Otherwise go ahead and put a real turbo on there.. You know you want to!

[ZZT231]

Thanks for the offer but I think I'll get them reco to factory spec as I don't want to replace them again.