I've tried searching, but cannot find anything on this.
I started working on a 2001 Formula last night that just had a cam and heads done. Small cam... 227/231 (0.61X/0.61X lift though) and ported 243s. One thing to note... it idles like it has a much bigger cam, which I can't figure out why.
Anyway, the TPS is giving me hell. At hot idle, IAC counts were around 70 and it was idling at 850. I did the idle air config and plugged in the base running airflow. I shut it off, tried to start it again... it'd hit, and then die. I cracked the blade open a little more, and it fired up and idled perfect. IAC counts dropped a little bit (about 60), and TPS was reading 1%. I tried to reset the TPS by unplugging it, turning the key on, wait, key back off, plug it back in, try again... It wouldn't reset.
I wasn't going to worry too much at this point, but it kept wanting to die if you revved it. For kicks, I forced the IAC counts to 100 and revved it... settled back down to idle perfectly. Next, I just unplugged the TPS and adjusted the set screw to get IAC counts down to 40. It idled perfect, and wouldn't stall out at all. The problem though is the TPS wants to read 2% at this point, so it ends up idling high.
I tried resetting the TPS multiple times, but it won't reset. I'm pretty sure I need to adjust the actual voltage of it. However, I've been having a hard time finding instructions on how to do that. Can anybody explain how to properly adjust the voltage at closed throttle?
What's really tripping me out is I've done about eight cable throttle cars in the past two weeks, and not a single one did this crap. All of them would reset the TPS and idle/recover perfectly... even some MS4 and T-Rex cammed cars. The only thing different about this car in question is it's an automatic. It won't stall out if it's in gear... only in neutral.