One320B

How do you know it's timing, it doesn't sound like the timing is what's causing your high idle..it should be the last thing to check for idle problems unless you've messed w/ it recently.



Do what nospig says and pull the BAC plug...the RPM should drop...trying to check timing w/ idle fluctuating or above 1200RPM is going to be inaccurate.



What all have you done to the car recently? tb mod? anything? did you remove the emissions and since then it doesn't idle correctly?



Removing the emissions will cause a higher idle..typically in the 1000-1200rpm range though... idling at 1500RPM isn't the end of the world unless it affects your driving. If the car drives fine...then your timing isn't off.

fc3s4utnv

the car drives okay, but is not up to power. Its a new engine, no emmisions, tb mod, very mild porting, but when I check the timing with a light it is probably about 10 to 15 degrees off of the mark.

teknics

i really doubt the timing is your high idle cause.



back off all the TB's idle adjustments (idle set screw, might be the only one on a t2, ive been working with my n/a more lately and it has 2 so whatever) so that the throttle plates are completely closed. try starting the car and see how low the idle is if the car even starts.



kevin.

fc3s4utnv

I think its timing realted bc you can turn the cas, and the idle speed will change. I know I dont have any leaks bc I hace sprayed around every joint with carb cleaner and it does nothing.

Nospig

Timing will be 10-15 advanced when idle is higher than 8-900rpm . If you load the motor does the idle drop, or rev back up?

teknics

2 things about "carb cleaner trick"



1) it doesnt always work, its not the best way to go about things.



2) spray carb cleaner on rubber = expanded deteriorated rubber. dont just go sprayin that stuff on anything.



kevin.

fc3s4utnv

Im not an idiot, I just sprayed it on the joints where I could possible have a leak, I.E manifolds.

teknics

you didnt use any rtv when putting any of those "joints" together? carb cleaner also makes rtv porous and those are harder leaks to detect.



kevin.

One320B

I always used soapy water...



The idle will change if you adjust the CAS, but that doesn't mean it's your problem...

89 Rag

Hopefully all this cas adjusting is being done with the correct plug being grounded out, otherwise the adjustments will not work.



AFM's go bad, it just happens



Clearly there is a problem, but it may not be limited to one item, besides we all know how annoying an abnormally high idle can be.