With AC on, Camaro dies at when at a stop...
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Junior Member
Joined: Jul 2015
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From: At Present, Massachusetts but moving to Florida
Car: Camaro
Engine: 2.8 v6
With AC on, Camaro dies at when at a stop...
My Camaro is an 88 V6 and I keep it up in all respects and to the best of ability. I never had AC until I finally did some studying and work and rebuilt the AC system putting in a new AC Delco compressor and cleaning out the tubes with new dryer and valve and rings. Got nice cold air (after figuring out a vacuum leak). But, when I come to stop the engine dies. I had this happen today and I thankfully got a push into a parking lot by some young guys and one of them mentioned it could be something electrical. I had been thinking it was the load from the compressor at low rpms.
So, after being proud of my 66 year old self of reworking the AC system. I am now at point where I can't use it.
Any help is appreciated. Thank pmmboston
So, after being proud of my 66 year old self of reworking the AC system. I am now at point where I can't use it.
Any help is appreciated. Thank pmmboston
Junior Member
Joined: Jun 2013
Posts: 16
Likes: 7
Re: With AC on, Camaro dies at when at a stop...
Hey there!
If your AC is on and the engine stumbles to a stop, then your ECM is having trouble keeping up with the advanced idle. So let's go through some steps!
Process is:
AC ON > Compressor causes drag > ECM increases idle to maintain "normal".
Result:
Stall at stop.
Now if it's stalling at stop and not under braking, that's good and rules out a vacuum issue. Leaving your Idle Air Control Valve (IAC):
STANDARD MOTOR PRODUCTS AC1 (#39.79)
If it's still original, then it's likely worn out and not as able to keep up with the load changes. You CAN clean it and kiiiiiinda test it, but they're fairly easy to come by from RockAuto, Amazon, AutoZone, and O'Reilly's.
Essentially, an IAC feeling its age can't move with sudden changes as well as when it was new. They're constantly breathing all kinds of junk and eventually get sticky and slow. And it's an absolutely necessary part, whether the AC is on or off.
If you were to take yours out, give it an quick visual inspection, maybe hose it out with some throttle body cleaner, you might coax a few more stop lights out of it. But one way or another, even as a weekender, you'll end up replacing it.
All of these parts together, the injectors, the plugs (and their wires), the dizzy cap and rotor, the ignition coil, and the IAC, are all playing a concert at idle. The older those parts are, the less naturally in-sync they are, the worse the concert until they stop playing altogether.
If anyone has any other thoughts, I'm sure they'll drop them here soon.
Good luck, Maestro.
If your AC is on and the engine stumbles to a stop, then your ECM is having trouble keeping up with the advanced idle. So let's go through some steps!
Process is:
AC ON > Compressor causes drag > ECM increases idle to maintain "normal".
Result:
Stall at stop.
Now if it's stalling at stop and not under braking, that's good and rules out a vacuum issue. Leaving your Idle Air Control Valve (IAC):
STANDARD MOTOR PRODUCTS AC1 (#39.79)
If it's still original, then it's likely worn out and not as able to keep up with the load changes. You CAN clean it and kiiiiiinda test it, but they're fairly easy to come by from RockAuto, Amazon, AutoZone, and O'Reilly's.
Essentially, an IAC feeling its age can't move with sudden changes as well as when it was new. They're constantly breathing all kinds of junk and eventually get sticky and slow. And it's an absolutely necessary part, whether the AC is on or off.
If you were to take yours out, give it an quick visual inspection, maybe hose it out with some throttle body cleaner, you might coax a few more stop lights out of it. But one way or another, even as a weekender, you'll end up replacing it.
All of these parts together, the injectors, the plugs (and their wires), the dizzy cap and rotor, the ignition coil, and the IAC, are all playing a concert at idle. The older those parts are, the less naturally in-sync they are, the worse the concert until they stop playing altogether.
If anyone has any other thoughts, I'm sure they'll drop them here soon.
Good luck, Maestro.
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