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I said you shouldn't be trying to adjust the idle manually. Naturally you set the base timing manually... while at idle.

The order you need to approach this from is as follows:

Fix the cause of the error code. Code 51 is usually due to the TPS being misaligned or defective OR moving the throttle plate while in the diag mode.

Another cause for a code 51 and idle issues can be if the throttle stop screw has been improperly adjusted or if the dashpot is adjusted incorrectly or stuck.

The IDL switch in the TPS is what the ECU looks for to know the throttle is closed. Details on testing it are in the same section as the TPS alignment details. TSRM > EFI System > Air Induction system > Throttle Body (7M-GE)


Until you have got the idle back within the approximate range and the code 51 taken care of you shouldn't touch the timing. The timing can cause erratic timing issues as the engine falters, but it's not going to cause a steady increase.


EDIT: I don't think the ECU checks the coolant temp when in the diagnostic mode... I could be wrong but I think it ignores input from all of the trim sensors.