motor shutting off when idleing between surf sets

[Guest]

Every time we go surfing lately after a few sets when coming back to a downed rider at or just above idle my 2004 22V with 350 mercruiser will die. We can always fire right back up but it is certainly annoying and a bit worrisome. We are not running that much weight, just a 400 in the port side, a 250 under the port seats and a 500 in the belly plus a few peeps. Any ideas? It used to seem like it would happen after hours of surfing, now it is more like 30 minutes. I had my local dealer look at it last year and they could not find anything. This season I got the impeller changed at the annual service. Any suggestions as always would be greatly appreciated!

[Domsz06]

is it alamring and running hot?

When they changed your impeller was it fully intact?

I had a similar problem because a piece of impeller was in the system and limiting flow so it was running hot.

[Guest]

No it is not alarming or running hot. I need to look closer at the exact temp next time but it is right at the temp it always runs at. I want to sat like 175?

[chpthril]

Sounds like either a vacuum leak or a sticking IAC (Idle Air Control) motor. They are easy to remove and clean with a spray can of carb cleaner. May not hurt to clean the spark arrestor and throttle plates as well.

[Guest]

Thanks. Good stuff to check out this weekend, I will find a manual to find all these suspect parts and see what I can find.

[Moki]

Thanks. Good stuff to check out this weekend, I will find a manual to find all these suspect parts and see what I can find.

Mine does this as well, if it is very hot outside. My guess was that maybe vapor locking in the fuel line? The longer I let it wait before restarting, the more times it happens. Since it only happens when temps are around 100, I have done nothing, and engine always runs fine when it is cooler.

On second though, read this thread: IAC

[Guest]

That does sound like the IAC. That will be the first thing I look at on Saturday before I hit the lake. Thanks again Gentleman for the great advice!

[TRD]

I was getting air in my fuel manifold. We purged it last time out and it ran great all wkend. We put 9hrs on it during the Memorial day wkend. About 3-4 was surfing.

[dogbert]

I'm in the same temps as you, AustinSouthSide. I've found that I need to run my blower when temps are real hot because I have trouble restarting after I turn the motor off following a run. It could be that you're not getting enough air into your engine compartment. I'd also try cleaning the flame arrestor as Chpthril suggests.