Is there a way to adjust the idle? I figured that because it was fuel injected it was all controled by the ECU.800 - 900 RPM according to the manual. Don't trust the tachometer in the dash if you try to adjust the idle, it is not accurate enough for this.
Thanks Bjorn much appreciated.The ECU has virtually no control over the idle speed, and yes, it can be adjusted. See page 10.95 of the FSM (attached). As mentioned earlier, use a proper tachometer for this, not the one in the dash. If you can't get the idle within spec using the idle screw, check the throttle stop screw on the the throttle body as outlined on page 10.104 of the FSM. And if you still have a problem, check that all air / vacuum hoses and fittings are present and in good order.
Edit:
What the FSM does not say is that you have to loosen the lock nut before adjusting the idle screw. After adjustment, tighten the lock nut again, and check that the idle is still in spec. Repeat as necessary.
+1Actually I would say 90% of the time it's because the auxiliary (idle air) bypass valve isn't closing off when it gets hot, that will bump the idle up considerably too....
looks like this
Auxiliary Air Valve (Fiat Pininfarina 124, X1/9, 131, Lancia Beta) - RECONDITIONED
Auxiliary Air Valve (Fiat Pininfarina 124, X1/9, 131, Lancia Beta) - RECONDITIONEDwww.midwest-bayless.com
worn bushes on the throttle shaft would be easy enough to see, you should be able to grab the linkage at the butterfly and move it back and forth a considerable amount, with a corresponding change in idle speed.
SteveC
Agreed, super easy to see. I usually just wiggle it by hand and immediately know if it's worn. Most are. Then I slop grease around there and immediately see the idle come back to normal. I've gotten cars past smog by greasing the bushing so it'll idle at the right level long enough to pass. I've yet to see a bypass valve fail. I've seen MANY worn butterfly bushes causing high idle.Actually I would say 90% of the time it's because the auxiliary (idle air) bypass valve isn't closing off when it gets hot, that will bump the idle up considerably too....
looks like this
Auxiliary Air Valve (Fiat Pininfarina 124, X1/9, 131, Lancia Beta) - RECONDITIONED
Auxiliary Air Valve (Fiat Pininfarina 124, X1/9, 131, Lancia Beta) - RECONDITIONEDwww.midwest-bayless.com
worn bushes on the throttle shaft would be easy enough to see, you should be able to grab the linkage at the butterfly and move it back and forth a considerable amount, with a corresponding change in idle speed.
SteveC