Hello Forum, I got a 92 silverado 305 5.0 automatic with a 16146299 AWHD ECM. Was having alot of idling issues. High idle in park and drive etc. I replaced speed sensor due to fluid leak and just because it's an old truck. So, idling is a whole lot better now. However idling it is in the low side both in park and drive. Come to find out that there is no park/neutral switch that I can find. There is a reverse switch in the bottom end of steering column. Don't think its in tranny as there is only a speed sensor and possibly a 3 wire TCC switch. Problem also is that there is no wire going to the park/neutral signal into the ECM. Should be the B10 input on ECM and there is no wire there. I could not even find the plug for the park/neutral switch. So not sure where to go from here. Doesn't it need this input to control idle. I also put me meter to the B10 input and there is 13 volts on there, this line should go to ground when in park or neutral. So I believe the ECM thinks it's always in drive. It also idles lower in drive than in park or neutral. Where to from here? Thanks.
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