Idle ECU

[doctorDHD@xxxx]

I was asked about the symptoms...Here are the symptoms of 6530. First she 
starts up perfectly all the time and every time. She idles at about 1200 for a 
while then starts hunting up and down between 800 and 1200. If I disconnect 
the ISM when it is at 800, it stays at 800. If I disconnect it when its up at 
1200 it stays at 1200. (From my understanding this should be normal because 
whatever position the rotary vane/valve is in when you disconnect power to it, 
it should stay there...or is this not correct?) Anyway it idles smoothly with 
no hunting when the ISM power is disconnected. I drove it in stop and highway 
traffic for 40 miles this past weekend and I was satisfied. The only problem 
was that since I had it disconnected at about 800 rpm, sometimes with the A/C 
headlights cooling fans, etc., it would almost stall...but it never did. When 
I started it up the next morning it started right up but stalled out unless I 
feed it some gas until it warmed up.

I don't understand why you say the engine should die if the power to the ISM 
is disconnected, unless it is meant to close automatically?

Dave & 6530




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