1GGTE Blow off valve caused vaccum problem.

[Gttwinturbomk3]

Hi there my Aussie buddys...

I,m James from NZ and are a big Supra fanatic. So are calling on some off the 1ggte fellas (Gurus) for some advise and help

I have just joined Toymods and are happy to finally be a part of this club.

A wee while ago i fitted a aftermarket blowoff valve too my AUTO 1ggte just for kicks to see what it would be like out off curiosity. which was stupid! I was just interested in seeing the effect it would have on the auto models. But curiosity kills the cat they say!

I adjusted the tension on the piston to the right idle pressure to open and shut at correct times and it was ok until i tee joined the vacuum hose from it back to the intake where the boost gauge reads from and then it idled and ran shit. Any ideas to what has happened???

I have taken everything off to do with it so it is back to normal again, and it is still idleing bad and not running well? The valve was atmospheric and when i set the idle pressure on it before i connected the vacuum line to intake, i drove it and it was working ok.

Cheers

[The Real Roadrunner]

pics or diagram to see how it was hooked up?

cheers
linden

[Gttwinturbomk3]

pics or diagram to see how it was hooked up?

cheers
linden

This is what it was connected up like (Yellow hoseing), now just the boost gauge is connected there.

[Gttwinturbomk3]

I think i must just have some sort of vacuum leak somewhere? otherwise why does it not idle and stall? someone here must have some ideas surely?

[GZ20 - Jake]

I think i must just have some sort of vacuum leak somewhere? otherwise why does it not idle and stall? someone here must have some ideas surely?

I seem to be having the same problem now, mine is hooked up to the same vacuum source as yours. My car turns on for about 2 seconds then dies, any suggestions?

[Gttwinturbomk3]

I seem to be having the same problem now, mine is hooked up to the same vacuum source as yours. My car turns on for about 2 seconds then dies, any suggestions?

Hi, is yours auto or manual gearbox? Thats what mine does just dies, but if you keep the revs up enough it will run but not properly.

Well if i cant figure this one out... it will just have to go to the garage and get looked at buy the mechanics.

[Jackel]

mines hooked up the same i have problems with idle but happened before i put bov on. My bov opens up like 3 seconds after i change gears :S

[Kyosho]

You either need to fix the vacuum leak on the small vacuum tube, or there could be a leak in the BOV itself as well.
As in, either the BOV vent area is sucking in air. Or where you've attached it to the intake pipe.

Check for vac leaks around there, if you feel around, whilst someone holds the revs up slightly (Don't pump the throttle, you want to try and keep it in as deep of a vacuum as possible to feel the air sucking in) you should find the problem.

[cultus]

I have a digital meter with the boost/vacuum sensor in the engine bay, initial setup:
1) 1 line to the fuel regulator
2) 1 line cross over the head for the power steering I think
3) 1 line for the butterflies ( I T-ed off to the BOV )
4) 1 line for the sensor ( I t-ed it for the extra greddy boost meter )

The car was running a bit funny, hesitates, delay effect. I tried running without BOV : same, so it wasn't the cause, can find no leak as well.

Then I swap the lines setup : 1 line for sensor alone, 1 for butterflies/BOV/meter and keep them as short as possible, it runs better/normal.

Maybe you can try it ( if you have a digital meter )

[cultus]

I mean if you have the pressure sensor.

I notice some 1Gs don't have it, is it only for GEN3? for the gauge in digital meter? or actually reading/feedback for the ECU?

[Gttwinturbomk3]

I mean if you have the pressure sensor.

I notice some 1Gs don't have it, is it only for GEN3? for the gauge in digital meter? or actually reading/feedback for the ECU?

Yes mate i had the boost pressure sensor tee joined up as well!

The sensor is for the digital gauges to show boost pressure. It does read feedback to the ecu as well though! And my car is a 86 model with factory digital dash. The car doesnt have to be a GEN3 ONLY to have a digital dash! as mine is GEN1 with yellow injectors.

As i said in the previous post that i took the b/off out and still had bad idle etc, since then i have further diognosed it myself and found out the problem which is GREAT!

It had was a very small (tiny pin prick hole in the vacuum line that i was using from the blow off valve so it has finally been fixed.

Thanks to everyone for taking the time to help me out
Cheers

James