Engine Stalls with AC

[walt]

When I come to a stop with the AC on the engine stalls. This only happens with the engine cold, problem disappears when car approaches full operating temp. Could this be a faulty decel valve?

[Bob Kontak]

Originally Posted by walt

When I come to a stop with the AC on the engine stalls. This only happens with the engine cold, problem disappears when car approaches full operating temp. Could this be a faulty decel valve?

I went to the doctor and said I broke my leg in two places. He said stay out of those places.

Put a golf tee in the skinny hose going to the decel valve and see. Easy peasy.

[walt]

The decel valve has been eliminated as an issue. Now I am thinking that this car has never had a fast idle at warm-up. It always ran smoothly at 950 rpm immediately after startup even in the dead of winter. Now when I start the car and turn the AC on, the rpm drops 100-150 and at times will oscillate a bit. Does this AC idle problem sound like something with the WUR? I don't have the pressure gauges but am willing to invest if this is worth checking.

[timmy2]

Check if AAR is opening when cold.
That is where the extra air comes from during warmup.

[proporsche]

Hi Walt..when you come to stop without A/C on the car does not die , right? Only with A/C..that means you are running too rich..check your fuel mixture...

Ivab

[fintstone]

Originally Posted by walt

When I come to a stop with the AC on the engine stalls. This only happens with the engine cold, problem disappears when car approaches full operating temp. Could this be a faulty decel valve?

It really depends on what year car/engine, etc. that you have. Perhaps you should share. Since you apparently have AC that works...maybe it is not even a 911.

[timmy2]

His sig line says ‘82 SC, I assumed that was the subject.
If you use mobile theme to read the forums, it doesn’t show up.

[fintstone]

LOL. Don't know how I missed that...long day i guess.

[T77911S]

don't run the AC when cold.

it could need just a slight mixture adjustment.
I would start it up, lift up on the air sensor plate while someone turns on the AC. could be just a little lean. if it is check fuel pressures and check for air leaks.

my 930 is fine at idle and cold. the reason I say is my engine produces less HP at idle than yours does im sure.

you might try bumping the idle up just a tad.

[walt]

Leaning out the fuel mixture a skosh made a dramatic improvement. As described in some earlier threads I attempted to check the setting by manual pushing and pulling on the throttle plate but evidently the hands of a skilled surgeon may be required for this one.

[proporsche]

hi Walt..as i have said above if too rich with the A/C it will die.
We use to sent up the fuel mix like this when our machine for co was kaput

Ivan