Power FC Runaway A/C
11-28-17, 05:36 PM
#1
Full Member
Thread Starter
Runaway A/C
So interesting issue.
I've just put A/C back into the car.
And it works amazing.
Well, except for an odd issue.
The a/c works fine when driving but if I pull to a stop and it idles...things get odd.
The A/c will continue to work. The engine will idle around 1300 - 1400 rpm as it's told to in Power FC.
For about 5 seconds that is. Then the engine slowly starts to idle up increasing in revs until it gets to 3000 rpm. The a/c continues to work and pump cold...and the engine will sit at 3000 and got to 2400 to 2600 for a moment before going back to 3000 occasionally I believe as the compressor cycles.
If I take off and start driving it goes back to normal driving nothing odd. And when I pull to a stop it idles once more around 1300 to 1400 for about 5 seconds before starting to idle back up to 3000.
Any clue why it would be doing this?
I've just put A/C back into the car.
And it works amazing.
Well, except for an odd issue.
The a/c works fine when driving but if I pull to a stop and it idles...things get odd.
The A/c will continue to work. The engine will idle around 1300 - 1400 rpm as it's told to in Power FC.
For about 5 seconds that is. Then the engine slowly starts to idle up increasing in revs until it gets to 3000 rpm. The a/c continues to work and pump cold...and the engine will sit at 3000 and got to 2400 to 2600 for a moment before going back to 3000 occasionally I believe as the compressor cycles.
If I take off and start driving it goes back to normal driving nothing odd. And when I pull to a stop it idles once more around 1300 to 1400 for about 5 seconds before starting to idle back up to 3000.
Any clue why it would be doing this?
11-29-17, 12:24 PM
#2
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The idle speed control (ISC) solenoid controls idle speed by regulating air flow. It is controlled by the ecu. Those are the two main items to look at.
The only other item that affects idle but should have already be deactivated is the AWS solenoid.
Make sure that the PFC pin for the AWS has been pulled or easier is to remove the connector from the solenoid.
Most people remove the solenoid and install a blocking plate when going to the PFC.
There would have to be some weird PFC malfunction for the AWS if working to be activated with the PFC.
Take off the ISC solenoid and clean out the valve on both sides. Activate it while cleaning it. Some owners have found trapped debris in the valve that can cause varying changes.
The only other item that affects idle but should have already be deactivated is the AWS solenoid.
Make sure that the PFC pin for the AWS has been pulled or easier is to remove the connector from the solenoid.
Most people remove the solenoid and install a blocking plate when going to the PFC.
There would have to be some weird PFC malfunction for the AWS if working to be activated with the PFC.
Take off the ISC solenoid and clean out the valve on both sides. Activate it while cleaning it. Some owners have found trapped debris in the valve that can cause varying changes.