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GT40 idle flare-up

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SharkSN View Drop Down
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    Posted: August-01-2011 at 6:07pm
I have the '97 engine the high idle on start-up and finally staying there (sticking) I decided to do something and quickly came up with solution.

Is it only the 97 motors??

http://www.youtube.com/watch?v=_SbLGE3UjQQhttp://www.youtube.com/watch?v=_SbLGE3UjQQ
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NAUTIQUEjunky View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NAUTIQUEjunky Quote  Post ReplyReply Direct Link To This Post Posted: August-02-2011 at 1:47am
Have you tried taking the IAC off and cleaning it with carb cleaner??
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SharkSN View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SharkSN Quote  Post ReplyReply Direct Link To This Post Posted: August-02-2011 at 3:39am
Yes that is what I went for I used LPS #2 on it. Might have to get a new one anyway....but to cure the flare up (PCM ECU) that has been there since new (my buddies '97 same thing) I manufactured a restrictor plate. Works great.

I think they fixed it in '98 tho correct?? and 1996 GT40's don't do it either.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: August-02-2011 at 8:27am
Paul,
LPS#2 is a lubricant and not really a cleaner. Where you trying to clean or lubricate?


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SharkSN View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SharkSN Quote  Post ReplyReply Direct Link To This Post Posted: August-02-2011 at 5:36pm
true... I use it for ISV's, air valves, vacuum actuators etc. on Porsches does the job and hangs in there. far superior to say WD40.

My GT40 is purring like a kitten with the restrictor in there. However it will on occasion go about 50-100 rpm high and stay there, and to me that seems like the IAC (idle air conrol) is hanging up but not sure. it doesn't have the same bumpy ride as when the Porsche ISV's stick up.



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Luchog View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Luchog Quote  Post ReplyReply Direct Link To This Post Posted: August-02-2011 at 9:07pm
I dont think I understand what is being discussed here... can anyone enlight me?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NAUTIQUEjunky Quote  Post ReplyReply Direct Link To This Post Posted: August-02-2011 at 11:24pm
IAC Idle Air Control valve all EFI motors have one, it controls idle in short term on the engine.. They do become "carbonized" after some age but lots of other sensors,have input to Idle control as well. Intake air temp sensor, map sensor ect...Coolant temp sensor, in a boats case it would be measuring lake water temp..
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Luchog View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Luchog Quote  Post ReplyReply Direct Link To This Post Posted: August-02-2011 at 11:31pm
All EFI engines I've driven rev a little higher at start up, specially when cold.

So still I dont follow what's going on here.
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M3Fan View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote M3Fan Quote  Post ReplyReply Direct Link To This Post Posted: August-03-2011 at 1:51am
Idle flare up was fixed with a later version of the GT40 ECU. That could be part of the problem. Do you have a number visible on your ECU?
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SharkSN View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SharkSN Quote  Post ReplyReply Direct Link To This Post Posted: August-04-2011 at 2:50pm
i have the original early 1997 ecu. my boat was the sea world display boat (sat on bunks outside seaworld san diego for the summer of 1997)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote M3Fan Quote  Post ReplyReply Direct Link To This Post Posted: August-04-2011 at 4:51pm
SkiDim carries the newer ECU, it's something like 550.00.
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