575SCi
#1
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Thread Starter
575SCi
New this year
When I put it in gear it almost dies but recovers and idles fine
When I put it back to neutral it revs up a bit then stabilizes back to a good idle. Just like an initial fast idle start.
Both engines are doing it. Each engine has two IAC's.
My first thought is the IAC's. What kind of number should they be at while idling in N and F/R. Next time out I'll plug the scanner in.
.030 pistons and 525ish roller cam if it makes a difference. Stock ECU's.
When I put it in gear it almost dies but recovers and idles fine
When I put it back to neutral it revs up a bit then stabilizes back to a good idle. Just like an initial fast idle start.
Both engines are doing it. Each engine has two IAC's.
My first thought is the IAC's. What kind of number should they be at while idling in N and F/R. Next time out I'll plug the scanner in.
.030 pistons and 525ish roller cam if it makes a difference. Stock ECU's.
#5
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Thread Starter
It was hot that day and I was waiting 2 hours at the locks so it might just be related to that. Forgot about it by the time I got back to Coulon and can't remember if it did it there or not. Next time out I'll bring the puter.
#7
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Actually, that day sucked. Left Coulon to cut, 15 minutes, idled 45 minutes to locks, waited for 3 hours to get through, 5 minutes to get to Edmonds. Moored and walked around for a couple hours, left Edmonds for locks, 5 minutes, waited 2 hours to get through, idled 45 minutes through cut, 15 minutes back to Coulon. But heck, I have a nice sunburn!
#9
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Thread Starter
Got some numbers port / star
fuel flow @ idle in N 2.7 / 2.7
fuel flow @ idle in F 2.9 / 3.0
injector on time in N 2.1 / 2.1
injector on time in F 2.3 / 2.3
IAC follower in N and F 0 / 0
base IAC in N 7 / 10
base IAC in F 70 / 72
IAC position in N 5 / 10
IAC position in F 70 / 72
baro 30.3
manifold 13.7
MAP @ idle V 1.96
throttle % 0
TPS @ idle .45
air temp F 82
engine temp F 143
The port engine is the one that feels loaded, like it has a larger prop. The RPMs and throttles are in the same position at all speeds so the props are true.
As I shift, the IAC,s go high then settle at the numbers posted.
If I've been running, come off plane to idle, let it stabilize, and shift to N, is when it feels like I've just taken a huge load off the engine the most. The idle jumps to about 1100 then settles back down. Port side only.
As I maneuver for docking it doesn't do the above but it does bring the RPM's down to about 500 every time I go into gear, then stabilizes at 750. Port side only.
Based on the numbers, your thoughts.
fuel flow @ idle in N 2.7 / 2.7
fuel flow @ idle in F 2.9 / 3.0
injector on time in N 2.1 / 2.1
injector on time in F 2.3 / 2.3
IAC follower in N and F 0 / 0
base IAC in N 7 / 10
base IAC in F 70 / 72
IAC position in N 5 / 10
IAC position in F 70 / 72
baro 30.3
manifold 13.7
MAP @ idle V 1.96
throttle % 0
TPS @ idle .45
air temp F 82
engine temp F 143
The port engine is the one that feels loaded, like it has a larger prop. The RPMs and throttles are in the same position at all speeds so the props are true.
As I shift, the IAC,s go high then settle at the numbers posted.
If I've been running, come off plane to idle, let it stabilize, and shift to N, is when it feels like I've just taken a huge load off the engine the most. The idle jumps to about 1100 then settles back down. Port side only.
As I maneuver for docking it doesn't do the above but it does bring the RPM's down to about 500 every time I go into gear, then stabilizes at 750. Port side only.
Based on the numbers, your thoughts.
Last edited by 1 MAIDEN AMERICA; 06-28-2016 at 10:21 AM.