EFIDynoTuning Forum

In the Idle Air write up there are two references to the SPOUT connector for measuring the AM for non mechanical idle:

If you so choose to dial in the airmass and throttle body airflow while custom tuning you must plug in the IAC, TPS, and SPOUT to calculate idle airmass.

... and later:

You must temporarily lock out the ignition timing to get an accurate idle airmass, this can be achieved by either removing the SPOUT CONNECTOR

Given the reference to locking timing at 10*, I am assuming the SPOUT needs to be disconnected, but IAC and TPS would remain. Is that correct?

If you are running deciphas A9L2 and mechanical idle then disregard that you just pay attention to the logged idle airmass correction.

If you’re still working with stock idle setup then yes spout comes out and iac disconnected. Disconnect tps if you need to open the throttle blade while the engine is running

Thanks, PaulC

To clarify, I am banging on the original A9L tune. I am not using mechanical idle (yet).

My query is not actually about the adjusting the idle screw, but measuring airmass at idle to update the FN875N table.

Given the timing lockout is required, reckon I'll just remove the SPOUT and leave the IAC and TPS.

My bad guess I didn’t read your OP clearly enough.

You unplug the iac and the spout and then log the maf air flow when the car is at operating temperature. You may even have to do something with the pcv valve since it also is pulling in fresh air which would skew the results of the TB airmass.

Thank you both, that makes sense. Much appreciated.