air conditioning on, idle hunting

[ecarca]

Dear All,

Since recently, the idle is hunting a bit when I put the a/c on.

It is not huge but I would say it keeps on going up and down about 150 rpm.

Do you have any ideas about the problem and its resolution?

Thank you!

 

[Zep]

To my mind this suggests some pulsing in the refrigerant flow. Mine hunts a bit on start up and after a bit of a thrashing, does it settle down?


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[richard_masa_4200]

I had a much larger hunting problem, but I tracked it down to a connection in the wiring above the heads under the black maserati plates. To the front f the engine there is a cable that goes in to the head and has a connection just before that. It fills with oil after time. I checked both of mine and cleaned and reconnected. Hunting gone.

 

[miket]

Sounds like the connections to the variators again, they were mentioned on another post recently...

Here it is:
http://www.sportsmaserati.com/showthread.php/17441-GS-running-rough?p=401188#post401188

 

[ecarca]

I had a much larger hunting problem, but I tracked it down to a connection in the wiring above the heads under the black maserati plates. To the front f the engine there is a cable that goes in to the head and has a connection just before that. It fills with oil after time. I checked both of mine and cleaned and reconnected. Hunting gone.

Yes, I checked the camshaft variator sensors about 10 days back, one had a little oil in it and the other one was fine.
The problem is still there. It keeps on hunting while the AC is on, it stops when it's off.

 

[ecarca]

To my mind this suggests some pulsing in the refrigerant flow. Mine hunts a bit on start up and after a bit of a thrashing, does it settle down?


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It also does happen sometimes after a sportier use, yes
How could I solve that if it was this?
It doesn't seem to really settle, however it is sometimes hunting more than others.

 

[Zep]

I would suspect something like a sticky idle control valve - but I am not super familiar with how the ECU manages idle speed. Perhaps someone else has experience of idle control issues?


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