Replaced A/C, now car dies when you turn it on
03-24-2016 | 12:42 PM
#1
Replaced A/C, now car dies when you turn it on Had my broke A/C system replaced and just got the car back. Car seems to idle fine, but as soon as I turn on the A/C, it stalls out. Not sure how the shop got it to run fine to check the A/C temp when they did the change, but they said to bring it back. If it's an issue on their end, I don't want them to point to the PCM tune as being the issue.
It was tuned by the local shop some time ago using HP Tuners for a speed density tune. Previously when I'd turn on the A/C, nothing would happen so I'm guessing that when they tuned the car at that time with the broke A/C, the idle was adjusted. The car is cammed. Do I need to get the car re-tuned for it to work correctly now with the A/C? Could it be something else like a sensor causing my issue? I read that the IAC relearn procedure is as follows:
1) Monitor your IAC, Idle Speed, throttle position voltage and your throttle position %.
2) With the key in the ON position, adjust your TB set screw until your throttle position is 2%.
3) Turn your key to the OFF position.
4) Unplug your Throttle Position Sensor (TPS) and IAC.
5) Turn your key to the ON position for a few seconds, and then OFF again.
6) Plug in the TPS and IAC and then turn your key to the ON position and restart logging. Your throttle position will now be reset to 0 degrees and about .45-.55 volts.
7) Start your engine, your IAC should be 40-60 for a cammed engine.
If you are not at your desired IAC position, redo the above procedures in smaller increments.
It was tuned by the local shop some time ago using HP Tuners for a speed density tune. Previously when I'd turn on the A/C, nothing would happen so I'm guessing that when they tuned the car at that time with the broke A/C, the idle was adjusted. The car is cammed. Do I need to get the car re-tuned for it to work correctly now with the A/C? Could it be something else like a sensor causing my issue? I read that the IAC relearn procedure is as follows:
1) Monitor your IAC, Idle Speed, throttle position voltage and your throttle position %.
2) With the key in the ON position, adjust your TB set screw until your throttle position is 2%.
3) Turn your key to the OFF position.
4) Unplug your Throttle Position Sensor (TPS) and IAC.
5) Turn your key to the ON position for a few seconds, and then OFF again.
6) Plug in the TPS and IAC and then turn your key to the ON position and restart logging. Your throttle position will now be reset to 0 degrees and about .45-.55 volts.
7) Start your engine, your IAC should be 40-60 for a cammed engine.
If you are not at your desired IAC position, redo the above procedures in smaller increments.
03-24-2016 | 02:59 PM
#2
Yeah, there's a couple of things to do. I'll look at my tune when I get home. You need to bump up airflow via the torque table under the a/c tab. It calculates airflow adder. There's a couple of other things too.
IAC shouldn't have anything to do with it unless you're reading more than 1% at idle.
IAC shouldn't have anything to do with it unless you're reading more than 1% at idle.
03-24-2016 | 08:01 PM
#4
Goto Torque Management > Engine
Change Ramp In from 4 to 6.
Goto AC Torque... vs AC.
Stock is:
Torque 5.000 6.504 6.992 7.500 7.598 8.594 10.000 13.008 14.004 18.008 21.992
Bump it up to:
Torque 9.004 11.699 12.578 13.496 13.672 15.469 18.008 23.418 25.215 32.422 39.590
See how that does.
Change Ramp In from 4 to 6.
Goto AC Torque... vs AC.
Stock is:
Torque 5.000 6.504 6.992 7.500 7.598 8.594 10.000 13.008 14.004 18.008 21.992
Bump it up to:
Torque 9.004 11.699 12.578 13.496 13.672 15.469 18.008 23.418 25.215 32.422 39.590
See how that does.