grannyknot wrote: ↑
Sat Jul 17, 2021 4:34 am
Okay, I finally got the engine running consistently, idle is about 900rpm, can't seem to get it lower without it starting to stumble, advance at idle is 19 degrees but when I blip the throttle the revs go up to 1200-1300 and hang there for 4 seconds or so before backing down to 900. The throttle cable isn't hanging up anywhere but the revs are. Does that sound like a recognizable symptom of something? Thanks
It sounds like you've got a vacuum leak somewhere. Base timing for the KA is 20 degrees but that's with the TPS unplugged and the engine warmed up.
I'd check your ECU for codes. Another thing that might cause that is a faulty CTS sensor. That's if the sensor fails low, the ECU would think that the engine was cold and use the idle-up table until it saw the motor warm up (which would never happen.) Don't confuse that for the single wire sending unit for your gauge cluster. They're two separate sensors. You can see the engine warm up on the gauge cluster and ECU be getting something completely different.
If the CTS fails altogether the ECU would throw a MIL code usually and you could read that. You can test the CTS sensor by removing it and putting it in boiling water (212F) and reading the resistance across the 2 terminals. Values are given in the FSM this site hosts.
It'd be easier to check for vacuum leaks first though.