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Factory manual indicates idle should be @ 600 rpm, but my new-to-me 2004 288 with 350 Mag MPI idle varies between 800 - 1200 rpm, so I am changing the IAC valve.
Should I really expect 600 rpm after the IAC replacement? (If so, this will really help docking maneuvers!)
"mtcaprio" post=814484 wrote:
Factory manual indicates idle should be @ 600 rpm, but my new-to-me 2004 288 with 350 Mag MPI idle varies between 800 - 1200 rpm, so I am changing the IAC valve.
Should I really expect 600 rpm after the IAC replacement? (If so, this will really help docking maneuvers!)
Can't tell you if it's the AIC or not but yes you should expect around 600 RPM at idle.
Dave
Edmonds, WA
"THE FIX"
'93 2556
Carbureted 383 Vortec-Bravo II 2.0:1 18 1/4x19 P
"mtcaprio" post=814484 wrote:
Factory manual indicates idle should be @ 600 rpm, but my new-to-me 2004 288 with 350 Mag MPI idle varies between 800 - 1200 rpm, so I am changing the IAC valve.
Should I really expect 600 rpm after the IAC replacement? (If so, this will really help docking maneuvers!)
[color]blue wrote:
Yes, it will!
If the Marine Engine was equipped with a standard auto type transmission with a manually operated clutch, the RPM would not be as critical.
However, our stern drive Marine Engines are equipped with either a Dog Clutch or Cone Clutch system.
Intrinsically, the Dog Clutch or Cone Clutch wants to remain Engaged while torque is against the propeller.
The Higher RPM, the more torque against the clutch..... the lower RPM, the less torque against the clutch.
With a recommended low idle RPM, it becomes much easier to disengage the Dog or Cone clutch system.[/color]
Rick E. Gresham, Oregon
2850 Bounty Sedan Flybridge model
Twin 280 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set
"mtcaprio" post=814484 wrote:
Factory manual indicates idle should be @ 600 rpm, but my new-to-me 2004 288 with 350 Mag MPI idle varies between 800 - 1200 rpm, so I am changing the IAC valve.
I don't recall exactly what RPM mine idles at, but 600 RPM sounds about right. It is definitely not as high as 800-1200 RPM.. There's a significant amount of throttle movement between idle and 1000 RPM. If I remember right, at 1000 RPM I'm just about at or above the harbor's 5 MPH speed limit.
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