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articfriends

11-16-2019 01:38 PM

Quote:

Originally Posted by scippy (Post 4715212)

Getting cold here going to winterize the boat this is an issue now to take up in the spring ....I found on the r/s rear end of the throttle valve in a recessed hole an alan head screw to manually advance or retard idle
I have one more shot to run engines before winterize ........I'll go through all the steps suggested.........Thanks all!

Thats not really how idle is set, that positions the throttle blades so iac count has enough.left to recover when you put it in and out of gear but a low enough iac # to NOT go to zero warmed up and idle too high. If this is a new problem (this uncontrolled high idle) and it was fine at one point, if you start pissing with that when problems actually a vacuum leak you will need to chsnge it back or iac will have no control once you fix actual problem, Smitty

scippy

11-16-2019 05:59 PM

Quote:

Originally Posted by articfriends (Post 4715219)

OK.......I'll leave as is and search for what seems to be the main culprit a "vacuum leak"......is just a consequence that both engines have (at the same time) a vacuum leak?.......kinda weird to me, but we will eventually find it.

Trash

11-16-2019 09:08 PM

Quote:

Originally Posted by scippy (Post 4715237)

No it doesn't mean both have a vacuum leak. The high idle motor likely does or the throttle blades/linkage are not working correctly. Fix this engine/problem first, THEN we can address the other motor that stumbles.

Griff

11-17-2019 12:21 AM

Quote:

Originally Posted by scippy (Post 4715237)

Your original post said it was the port engine with the high idle???

RAPTOR1

11-17-2019 10:32 AM

Quote:

Originally Posted by scippy (Post 4714816)

Can someone tell me how you can adjust the idle speed (rpm's) on a AS&M EFI?....the port engine idle speed on my 575 is a high 2,000 rpm's while the other is just barely choking out.
https://cimg3.ibsrv.net/gimg/www.off...76df40b319.jpg

It appears you have tall deck intake adapter plates, definitely look for vacuum leak!

F-2 Speedy

11-17-2019 11:01 AM

just under the throttle bracket in the upper plenum there is a port in the side is it blocked off ?? this is where the hose to the lower center plenum ( PCV ) connects.

scippy

11-17-2019 11:38 AM

Quote:

Originally Posted by Griff (Post 4715255)

Your original post said it was the port engine with the high idle???

It is the port engine with the excessive high idle. The stb. engine (at idle) is barely running. feedback (I assumed) was vacuum leak, bad IAC or TPS for both engines.

scippy

11-17-2019 11:40 AM

Quote:

Originally Posted by RAPTOR1 (Post 4715287)

It appears you have tall deck intake adapter plates, definitely look for vacuum leak!

Yes intake adapter plate, a bad seal there?

scippy

11-17-2019 11:54 AM

Quote:

Originally Posted by F-2 Speedy (Post 4715289)

just under the throttle bracket in the upper plenum there is a port in the side is it blocked off ?? this is where the hose to the lower center plenum ( PCV ) connects.

Winterized boat yesterday, but still have access.............whether blocked off or not, engines ran great until this season & considering no one touched anything before this problem I think it's a mute point.
Unless PVC has gone bad or hose detached.....but being blocked off ?...wouldn't that be an international move?

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