[V12AML]

This is more of a technical/strategy question than a tuning one.

Vehicle is a 2000 Aston DB7 Vantage with the Ford AM01 V12. It uses two EEC-V controllers, one for left bank (1) and the other for the right (2). Two separate TPS, MAF, CMP, CKP, IAC are used, the only common inputs are ECT and VSS.

This car initially came in with a severe drivability issue and codes logged on the left bank. LH PCM logged a P0301 thru P0306, along with a P1312 (calculated airflow not matching with TPS readout). Very rough idle felt on the bank 1, backfired heavily under load.

I fired up the old WDS and checked the learned resting position, left was .88V and right was at 1.03V which I figured were both acceptable. Then I found the throttle sync test to compare values between both PCMs.

KOEO, I ran the test and saw bank 2 would register part throttle a split second faster than bank 1, when I let off the pedal the test screen immediately indicated a fail.

I doubt this is the main cause of the poor running (more on that later) but what sort of issues could be expected from a variation of more than .30V from bank to bank? Pictures attached below.

https://ibb.co/KqfGHCB
https://ibb.co/0GwxGdC
https://ibb.co/jh0Yqtq

[sailorbob]

If the throttle difference results in different airflow there is the possibility of slightly rough running due to different A/F ratios and spark advance between the banks.

[V12AML]

Ended up resolving the underlying issue. Old fuel, dying cam sensor and a couple bad coils.

Cruising along just fine with the mismatched TP values.