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A/C and idling adjustment

FM Former Member
The other day I was driving with my A/C on and when I came to a stop, the engine died (never had a problem before). Without the A/C on, the car idles around 700 rpms. I adjusted the idle up to 900 rpms and when I turned on the A/C it dropped down to about 400 rpms, but at least it didn't stall. I'm trying to figure out if there's something that's supposed to kick up the idle when the A/C is turned on. There are two ground wires going from the A/C to the carb, but I don't know they're supposed to do. Any A/C experts out there? I'll post some pics later
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FM Former Member
The other day I was driving with my A/C on and when I came to a stop, the engine died (never had a problem before). Without the A/C on, the car idles around 700 rpms. I adjusted the idle up to 900 rpms and when I turned on the A/C it dropped down to about 400 rpms, but at least it didn't stall. I'm trying to figure out if there's something that's supposed to kick up the idle when the A/C is turned on. There are two ground wires going from the A/C to the carb, but I don't know they're supposed to do. Any A/C experts out there? I'll post some pics later
LeonChuppLeonChupp
The TOYOTA and most RICE BURNER types used to incorporate a vacuume switch that dropped out the A/C compressor when manifold vaccume was high. (Idle=Max vacuume.) This was in the !970-80 time frame, when gas economy was of primary importance.

Most US iron and the Europeans opted to control engine speed directly.
"Keep the driver cool, no matter what."

My 1978 Toyota long bed 3/4 ton truck(carburated) could get up to 35mpg., if I held a steady speed, and didn't dog it...

Hope this helps....

Leon C.
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