Ok fellas, I have a very weird issue. It?s making me want to pull my hair out. 2004 ls1 gto. Cable driven throttle body. The throttle body is a ebay 92mm. Before you say it?s the throttle body (and it very well may be) hear me out. I have this anomaly, I can?t purposely make it happen, it?s random. I can watch my scanner at idle and every now and then my tps % will go from 0 to .4%. It?ll happen when I?m coming to a stop and it?ll cause the idle to dip, surge etc. I?ve also had it just get stuck st .4%. No matter if I open the throttle and slam it shut, it stays there. Only think I can do at that point is a tps relearn. It mainly will do that if I rev the car in neutral and if it dies returning to idle it?ll get stuck at .4%. I?ve replaced the tps three times. The first two were borg Warner (junk) and the one I have now is a new delco factory one.
I found (before I put the delco one in) that the throttle shaft part that goes into the tps was too long and the flat part wasn?t far enough in the recess. I chucked the shaft up in my lathe and made the dimensions match a factory throttle body. Didn?t help. It was binding in the previous tps?s i Had but not the one that?s on there now but I still have the same problem. I hat to go spend $400 on a new nick Williams Tb and it not fix my issue. A buddy of mine told me sometimes the .4%-0% are so close that he shims the throttle blade open a tiny bit and then does a tps relearn so you have a little more leeway in the 0 position. Makes sense but seems like a rigged up way of doing it. Maybe there?s a setting I can?t find that allows me to raise the minimum idle %? Has anyone seen this weird issue?