Re: AW: [DML] Re: End of life for idle ECU's

[Martin Gutkowski - DMUK Ltd <martin@xxxxxxxxxxxxxx>]

Elvis Nocita wrote:

 >And still - a good control loop can compensate any hunting of the idle,
 >especially the bad ones that let the idle vary with about 1Hz.
 >
 >There's absolutely no reason or explanation behind an idle speed hunting
 >
It's simply down to the speed at which the auxiliary air valve can move.
Modern engines use ignitionadvance/retard to fine-tune engine speed, and
the aux air valve is just for coarse adjustments. That coarse (slow)
adjustment is all we have.

 >And also there's a diference between cold and warm ! Sometimes when cold
 >the engine may hunt very bad but suddenly stopps to hunt when it gets 
warm.
 >
The point at which it stops is the point at which the lambda system
switches into active mixture control - proving that the hunting is
caused by a rich mixture in the first place. This is normal on an
original DeLorean engine.

I agree with you that a vac leak will not cause our typical hunting.

Martin







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