ISCV 1 ggte

[turmite]

2 questions, 1st what does the valve thingy on the manifold side of the ISCV do? and 2nd there is a rubber spacer that holds the valve thingy in the manifold, it has a chamfer on 1 side, does the chamfer face into the manifold or face the valve thingy?

[wilbo666]

It's a check valve / one way valve to stop air being blown out the ISCV when the engine is on boost (makes sense eh!)

You want to make sure that the valve is setup so that air can go in the ISCV to intake direction but cannot go in the intake to the ISCV direction.

Check the last image on my wiki also, shows 7mgte but the arrangement is similar.
I don't recall a chamfer, but I would install it in which ever fashion looked like it would interfere with the flow the least...

http://wilbo666.pbworks.com/w/page/4...CV%29%20Wiring

Cheers
Wilbo

[turmite]

Ok, hereis the problem , my 1ggte is making boost according to the boost gauge , I can hear the the turbos spooling up. But no power and the engine spews fuel out of the exhaust, it's as if I have a boost leak! I have been over every possible joint / connection twice and nothing shows, the plugs are black and sooty indicating again super rich. In your opinion could the 1 way valve in the iscv be the problem? I have tested every other sensor in the car and they come up fine, this is why I operated on the iscv to start with!

[ddeane]

Gidday
Anyway that you can check your fuel regulator? Some years ago, in the short time the engine was out of my car, a wasp built a nest in the fuel return line. Result fuel rail pressure of 96psi. Symptoms that you have sound similar.

Craig

[wilbo666]

It should be a trivial task to make sure that the ISCV one way valve is installed the right way

Another thing that you can try is fully closing the ISCV if you think the one way valve might be faulty...
You could close the ISCV by applying power to the required pins, in the required order as shown in the TSRM. Then make sure that you leave the ISCV unplugged (so that the engine ECU doesn't open/close it!).
You would want to wind the throttle stop out to allow the engine to idle without the ISCV (effectively crack the throttle to make up for the air flow of the ISCV).

Or you could make a plate to block off the ISCV

Cheers
Wilbo

[turmite]

Ok, just tested iscv, it's. Its not the problem, so changed ecu temp sender, still no joy. I would pull the turbs apart and check waste gate function but that wouldn't account for the over fuel prob. I'm running out of ideas here, anybody want to have a stab?

[wilbo666]

You're 110% sure that you don't have a post AFM air leak?

Cheers
Wilbo

[turmite]

Yup, checked everything twice over, checked all sensors on scan tool, FPR reads ok so I think 1 of the waste gates or turbo actuators is stuffed. I really don't want to loose the motor because it's a really Brilliant little motor and turbo replacement options on a 89 model are limited. So.....

[wilbo666]

Do you have the correct size injectors for the generation engine ECU you have?

I recall different generations of 1GGTE having different size injectors


Also I'd spend the money and fit a WBO2 personally, they aren't very expensive these days!

And you have checked for error codes?

Cheers
Wilbo

[turmite]

I have had this motor in the car for 6 years and it's been fine up till now. I can't check for error code because I wired to suit the original 82 model dash and it doesn't have a light for this. I'm gonna pull the turns apart today and have a look but ta for the help anny way
Turmite

[turmite]

I take it that a WBO2 is an after market o2 sensor?

[turmite]

Wilbo666 is it possible that gas from the compressor side could be passing the seals and going into the exhaust side of the turbos? I ask because the actuators seem to be working fine?

[wilbo666]

I take it that a WBO2 is an after market o2 sensor?

Yep, a Wide Band Oxygen Sensor. Have a google, they are made by a fair few companies at affordable prices (sub $300) these days (techedge, PLX, innovate, AEM, etc)

Wilbo666 is it possible that gas from the compressor side could be passing the seals and going into the exhaust side of the turbos? I ask because the actuators seem to be working fine?

The fact that you say it is making boost fine doesn't make me think there is a problem with the turbos.

If the turbos are making boost and not leaking masses of oil (check intake pipe/s and watch for oil smoke out the exhaust) then I don't see how they are the problem...? If one turbo fails in a parallel twin turbo arrangement then you loose boost - it doesn't sounds like this had happened to you...

To me it sounds like an over fulling problem? So I'd be checking things like the AFR (with a WBO2), AFM, coolant temp sensor, air temp sensor (really part of the AFM), engine ECU and fuel pressure (fuel pressure reg) as these are the main things that effect the AFR (Air Fuel Ratio)...



Chers
Wilbo

[turmite]

Mate, found the prob, the distributor! Now I just gotta find one but thanks for all your help
Geoff