Fast Idle 88 Turbo

[Guest c8olj]

Help....fitted an Oil catch Tank, and took the time to replace the little green crank case diverter, reducing the hose size to mate with the oil catch tank. Fitted a new induction hose btween the air box and the turbo, as that was full of oil, and had a couple of holes in it where it had fretted on cables etc.

All looked great, car started fine, but remained at circa 2000 rpm, even when warm, and even after blipping the throttle.

OK, I thought it was something to do with the catch tank, so I removed the pipe from the green thing, and left it venting, no difference.

What could I have done?. Do you think that maybe because the vacuum system side of things is working properly, that its advanced the timing?

Edited July 12, 2007 by c8olj

[pauli]

Help....fitted an Oil catch Tank, and took the time to replace the little green crank case diverter, reducing the hose size to mate with the oil catch tank. Fitted a new induction hose btween the air box and the turbo, as that was full of oil, and had a couple of holes in it where it had fretted on cables etc.

All looked great, car started fine, but remained at circa 2000 rpm, even when warm, and even after blipping the throttle.

OK, I thought it was something to do with the catch tank, so I removed the pipe from the green thing, and left it venting, no difference.

What could I have done?. Do you think that maybe because the vacuum system side of things is working properly, that its advanced the timing?

hi,

don`t think this will be the catch tank, maybe your old induction hose was sucking in air through the holes, and by fitting a new one the balance may be upset. Have you tried turning down the idle srew? may be worth a try

[Guest c8olj]

Help....fitted an Oil catch Tank, and took the time to replace the little green crank case diverter, reducing the hose size to mate with the oil catch tank. Fitted a new induction hose btween the air box and the turbo, as that was full of oil, and had a couple of holes in it where it had fretted on cables etc.

All looked great, car started fine, but remained at circa 2000 rpm, even when warm, and even after blipping the throttle.

OK, I thought it was something to do with the catch tank, so I removed the pipe from the green thing, and left it venting, no difference.

What could I have done?. Do you think that maybe because the vacuum system side of things is working properly, that its advanced the timing?

[Paula&Marcus]

Hi All,

If it is a GM MPFI fuel injected car, there will be no idle screw !!!!

There is nothing to screw around. NOTHING !

Yes, there are two screws that look like idle screws, but they are NOT. And they should not get touched unless you really know what you are doing.

One is the intake balance screw and yould NEVER get touched unless you wish to rebalance your whole setup on a flow bench.

The second one is the minimum air rate screw and this defines the operation range for the IAC valve.

I personally believe that you have disturbed one of the hoses. Please have a look at your hatch, there is a sticker that shows you all the tubing. Investigate for leaking or broken or disconnected or disturbed tubes ....

Cheers

Marcus

hi,

don`t think this will be the catch tank, maybe your old induction hose was sucking in air through the holes, and by fitting a new one the balance may be upset. Have you tried turning down the idle srew? may be worth a try

[Guest c8olj]

Sorted it. Must have lent on the Throttle Idle Solenoid Jack, although you would be hard pressed to even tell that the bracket had deformed. Anyway, pulling back on the bracket saw an instant drop in revs.