Mark tuned my computers as well. If you remember, let me know what he tells you. Mine didn't give that fault code until I had them tuned, but that doesn't really mean anything.

Good info sharing guys.
Timing and fueling has alot to do with idle vacuum (map) too, not just iac ....so maybe could have been effected by a program change.

I certainly will...

My other thought was maybe opening the throttle blades a touch more while watching the IAC duty cycle at idle to get it in the lower % of it's cycle. OR relacing the IAC motors..
Mine ARE original 2003 ..

But likely it's just a vacuum drop caused by the load when going in gear and that won't change anything ...

I'll let you know if I find anything..

My IACs are new this summer. I bought them from MDC, and they were not cheap Chinese junk.

I had forgotten all about this 'till I took the boat out the other day...

I called and spoke with Mark, He said it's caused by the ECM not seeing the vacuum value it expects.

He can turn off the warning for this.. AS WELL as the warnings for the uninstalled sensors that come up every time I start the engine..


Doug

Turns out my engines had 600 cams and a 700 tune. I just installed the correct cams. I’m sure I just found out why i was getting non-stop alarms last year.

Man, thought working on engines with 2-4 cams where tough. Wow ! Wink

sorry, tired....so alittle slap happy...lolol