Idle too high. How do I adjust

[Bob Valentine]

Yes, the VSS is the speed sensor.    The VSS has a lot to do with idle
since in a car app the ECM uses it to determine accel/decell/stop.  No VSS
and/or no park/neutral usually results in some wierd driveablity problems.

What sort of data is the scantool saying at WOT?  

Have any pictures of this you can post somewhere?  Sounds interesting.

-> Bob Valentine
-> bob at tecmark.com

At 12:57 PM 9/5/2001 -0500, you wrote:
>Im not up on all the lingo, but Im assuming the VSS is the speed sensor. If
>so, I do not have it connected to anything. Are you thinking this effects
>upper rpm or idle? I dont have the gear selector connected either. Isnt this
>a neutral/park indicator? Could the VSS limit the rpm to 4200?
>
>As far as the ecm and the elements. I realize its a risk, but I use my boat
>on a fresh water only and generally for a few hours at a time and is kept in
>dry storage. I did enclose the ecm in an aluminum box and packaged it in
>styrofoam. Its not water tight, but put in a place that should stay dry. I
>realize its a risk, but I thought Id give it a try. 
>
>For those interested in the conversion, it was a straight bolt in, other
>than having to mount the o2 sensor in one of the manifolds and the electric
>pump/return line. 
>
>> ----------
>> From: 	Gregory A. Parmer[SMTP:gparmer at acesag.auburn.edu]
>> Reply To: 	gmecm at diy-efi.org
>> Sent: 	Tuesday, September 04, 2001 2:41 PM
>> To: 	'gmecm at diy-efi.org'
>> Subject: 	Re: Idle too high. How do I adjust
>> 
>> 
>> > I have repowered my boat with a '90 rv tbi 7.4. It has a 747 ecu and
>> works
>> > nicely, other than the idle. The boat likes a 500+/- rpm idle and it's
>> > currently idling at 800. What can be done to adjust it? (Ive tried
>> backing
>> 
>> Is VSS connected?  To what?...I dunno either, but idle problems are often
>> related. It might be sufficient to "fake it" once so that the IAC can
>> reset itself. After that is covered, idle speed is set in the chip. See
>> programming 101 on the website for more info.
>> 
>> -greg
>> 
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