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Had them cleaned and tuned last year but the motor I’m having the trouble with is the one that hydraulic’d when it blew earlier this summer. The scan says injectors are firing and seem good (I inspected them when I did the rebuild) and flow rate is consistent. I’m leaning towards the IAC...

Wouldn’t that continue after putting in and out of gear? I agree it’s getting too much air - maybe I will reset the IAC again. I read somewhere that there’s a specific procedure for doing so (waiting 20 seconds after reset before energizing again) but I’ll need to research again. Seems like the...

Consistent vacuum and no vacuum leaks either. I originally thought a vacuum leak but wouldn’t that be consistent after putting it in and out of gear. The fact that it settles down after putting a temporary load on it is what’s baffling me.

Thanks for the reply and suggestion Wanderer. Yes I did swap MAP’s with no change. I also swapped the IAC’s as well - no change there. I did also reset the IAC with the scan tool. It appears to be an IAC issue because when in the scanner I can see the computer retarding the timing to bring the...

I have a situation that is perplexing me and I’m out of potential causes. This past year I replaced both of my Mercruiser 7.4L long blocks with new factory GM units. They are MEFI 2 models and the motors run great at idle and at cruise speed. The issue I am having is with the port motor idling...

I didn’t - I guess I assumed the mechanicals were solid being brand new factory long blocks. I did determine that my problem may be electrical; either a bad battery(s) affecting the ECM, or a bad ECM/reflash of the ECM needed. The ECM’s are a first generation so not sure about the ability to...

This past winter I replaced both motors in my 97 Sundancer. They are new GM 7.4L MPI’s attached to Hurth ZF transmissions. I’m experiencing a nagging issue on the starboard motor where after warming up it tends to idle rough, causing the transmission to rattle in gear. If I shut it down and...