High Idle Problems....

[SYNYSTAGLI]

Just recently dropped a G60 into my 90 Golf. Car runs great all except for the high idle.
We've pinched off all the vacuum lines, unplugged the ISV, messed with the idle screw, sprayed starter fluid all over, switched out chips in the ECU, Checked the timing.
Is there anything else I should check for?
I'm about ready to buy another ECU at this point.

Anyone know where I can download the schematic for the G60 ECU?

TIA for any help, Manny

[kerobert]

Had the same problem. Long story short, this is the only thing that worked after almost replacing everything including the ECU.

Reset you idle.

Idle Speed / CO Content
---------------------------------
1) Pull crankcase breather hose off pressure regulating valve and turn it so
that only
fresh air will be drawn in.

2) Let engine run at idle.

3) After approximately one minute disconnect the blue connector at the
coolant temperature sender.

4) Raise the engine speed four times to over 3000 RPMs and then let the
engine return
to idle (This cancels the hot start idle increase function).

5) Adjust idle screw if necessary.

6) Remove tamper resistant plug over the CO screw, rotate both adjustment
screws
alternately.
--- the idle speed is 800 30 RPMs
--- and the CO is around 1.2 %

7) Reconnect the blue temperature sensor harness plug.

Cool Raise the engine four more times to over 3000 RPMs and then let the engine
return to idle.

9) Check to make sure that the CO did not go out of specs.
--- If the CO is out of specs, check the oxygen sensor system.

10) With the settings correct shut off the engine and reconnect the crankcase
breather
hose.

Good Luck!

[SYNYSTAGLI]

Appreciate the help and info kerobert..

[G60 Carat]

There is a wire , green I think , that will raise the idle if it has power. Its to raise the idle when he a/c is on. But since you say this a swapped car check that wire. Its detailed in the faq section of this forum.

[SYNYSTAGLX]

Turned out to be a bad throttle idle microswitch. Cleaned it up and it worked, who knows for how long though. Anyone here have a source for these?

Thanks for all the help as well `