Fast idle on start!
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I just finished a new 454MAG MPI with an M1SC Procharger. I have been working out the bugs, but right now I have an issue with start up. Every time I start the engine, it revs to 2000 rpm for litarally 5 seconds and them comes back down to around 850-900.
What could be causing this?
-ECU was reprogrammed for this set up.
-I swapped out IAC with another running engine and no change.
-No vacuum leaks present
-If I put code checker on and leave in diagnostic mode this does not happen.
What could be causing this?
-ECU was reprogrammed for this set up.
-I swapped out IAC with another running engine and no change.
-No vacuum leaks present
-If I put code checker on and leave in diagnostic mode this does not happen.