My Original ecu was a 1227747 I'm looking at the old one now and its factory PROM is ANTY right on the case and on the prom I removed. The replacement from GM is a 88999146No, it's the other way around, 0 is closed, 140 is at the open "parked" position.
What PCM service number do you have? I'll look it up for you.
As far as open or closed its at 145 with all the air coming in and 0 with the pintle blocking all the air. The service manual I read for a 5.7 confused me by saying manually screw the pintle into the closed position and when you do the relearn it will full open to 0 and then it is set. So I don't know if open is closed or closed is open or what(damn engineers) lol...
But I do know this.
With the scan tool I have been using you can not turn of the 10k resister and I get a very different results that are almost like its fixed. So.. With the scan tool plugged in it idles in park at 1000rpm as it gets up to there at 750rpms I can see that my IAC counts are about 38 (little high I know it should be 30) at the 1000rpms it settles and the count is about 56 counts. But get this. When I put it into gear the rpms drop to around 625 and it slow increases to 750rpms and stays there.(good right?) The IAC counts are at full tilt 145!! Now I go back to park and it rpms race up to 2000rpms and hang there for about a minute then they start to come down and settle at ...... "1000RPMS!!!!" WHAT THE HELL IS GOING ON???? Why does having the scanner plugged in have to do with it doing this??? without the scanner and it is back to perfect idle in park 750rpms and it idle up to 750 when put in to gear then back to park 1500-1700rpms and NEVER COMES DOWN BELOW 1400RPMS No matter how long you wait. And yes I did the same test several times back and forth with and without the scanner with the same results both ways. Is it creating a ground? what does the 10k resister have to do with it? Can I put a resister in somewhere lol.. Starting to feel more like a bad (shorted) chip.
I just don't get it. Spent hours on this today. Oh and put a new temp sensor and egr valve in just to make sure that was covered. The temp sensor seems to be a little cooler. Fully warmed up the old one read 185 and the new one reads 179 so I don't know if that helps or hurts.
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