AAC

car: 1990 aus delivered 2+2 N/A manual.
start car cold, higher idle and drops to roughly 750rpm when warm,80degrees celcius.
Datascan shows 750rpm fluctuates slightly and AAC shows 12. TPS is .44v and hard idle switch is on.Up the revs and the hard idle turns off and the TPS reading rises.Turn on A/C or move the steering and revs compensate.
Go to active test and hit start for idle adjustment, AAC guage on datascan now reads 0.
adjust the idle air screw to 650 rpm, stop test and idle doesn't come up to 750rpm, go through the procedure again set idle to 750rpm stop test and idle doesn't rise and AAC reads 12.
during the test adjusting the air screw will change the revs.
Clean throttle bodies, all connections clean
Any thoughts?
Regards Trev.

 

what did AAC read when it was idling at 650 outside of test mode? I'm guessing sticky solenoid.

 

AAC is 12%?

Mine (no turbo) is 67% - 75%

One of us has a problem, unfortunately it might be me

 

from memory you're shooting for ~25

 

Fists, just checking it now.

 

fists, revs go up to 700 and AAC reads 20.

 

That's pretty close, if its not rough and doesn't stall I'd be happy. That said I ignore, the fact that mine idles at 900 so I might not be the best example.

 

thanks guys, I don't have a thanks button.

 

From the ConZult Manual:

Warm up engine
Specification:
Idle : 15 - 40 % (Non Turbo), 15 - 35 % (Twin Turbo)

 

:agree:

 

started car again, let warm up, revs are 700-750, AAC back reading 12 again.

 

Good thinking, I'll give it a go.Tah

 

Yours is perfect, 12% is showing that the manual adjustment is too high.

 

so does 12% reading at 700-750 rpm mean its set right?