More questions on IAC's
05-18-2003, 10:31 PM
#1
Ginger or Mary Ann?
Charter MemberThread Starter
More questions on IAC's
Ran a scanner on both of my motors today. As far as I can tell, both motors have no problems. I was just verifying the motor hrs in relation to dash hr meter. Dash; 127hrs, both motors read 161 hrs. Either bad gauge or unhooked for 1 season. Helps resale I guess. 
Have been somewhat following/lost on FastFormulas post on this topic, so just using it as a reference.
Keep in mind I ran the scanner right at start up and did not run long enough to warm up as was only interested in hr reading. These are only readings I wrote down, and can't recall anything else. (Idle RPM were right around 700 on both motors while checking)
'99 502MPI Star/Port
Throttle PCT 1/0
Map Volts 2.5/2.5
Manifold Pressure 17/17
IAC Postion 117/109
Base IAC 114/108
IAC follower 0/0
Are the high IAC readings do to the cold motors?
Thanks
Have been somewhat following/lost on FastFormulas post on this topic, so just using it as a reference.
Keep in mind I ran the scanner right at start up and did not run long enough to warm up as was only interested in hr reading. These are only readings I wrote down, and can't recall anything else. (Idle RPM were right around 700 on both motors while checking)
'99 502MPI Star/Port
Throttle PCT 1/0
Map Volts 2.5/2.5
Manifold Pressure 17/17
IAC Postion 117/109
Base IAC 114/108
IAC follower 0/0
Are the high IAC readings do to the cold motors?
Thanks
05-19-2003, 10:42 AM
#2
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Jerry,
Your IAC position is little high. That means it is opening up more to let air in to maintain the idle speed. There is a stop on the secondary throttle blade you can use to allow it to open more to get the counts down. It may be the cold temps like you mentioned, but I ran into the same thing when I set up my Whipple system. It has a larger throttle body which the IAC and TPS are installed, and the throttle blades need slight adjustment to get the idle right. That hour meter disconnect is a dirty trick. My hour meter will read more than the scan tool shows cause I bought a second ecu (ouch!) for backup.
Your IAC position is little high. That means it is opening up more to let air in to maintain the idle speed. There is a stop on the secondary throttle blade you can use to allow it to open more to get the counts down. It may be the cold temps like you mentioned, but I ran into the same thing when I set up my Whipple system. It has a larger throttle body which the IAC and TPS are installed, and the throttle blades need slight adjustment to get the idle right. That hour meter disconnect is a dirty trick. My hour meter will read more than the scan tool shows cause I bought a second ecu (ouch!) for backup.
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