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Old 06-20-2013, 08:47 AM
joe_padavano joe_padavano is offline
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The first question is, are you using a stock PROM or a custom PROM? The reality is that the OEMs use the A/C sensor for idle control more to help meet EPA idle emissions requirements than anything else. The idle mixture control needs to be very precise because of this, and the extra load of the A/C matters. Now, if you have a custom PROM, it's likely that the idle mixture is not as lean as stock, in which case you're probably OK without the sense wire. You should also check the wiring on your specific ECU. The '7747 has the pin to accept the A/C signal, even if it's not in the harness. The issue is if your PROM is programmed to look for it.
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