First cold start today after adjusting throttle plate. No real difference (still starts up fine, idles around 700-800 RPM and starts puffing out black exhaust smoke. Rev it up a bit and it clears its throat and all good. After warming up, letting the car sit for 20 mins while shopping, when I come back to start it (hot start) it cranks for about 5 seconds before firing up then revs flare to about 1500, then settles back to normal idle speed. Guess it’s time to swap out the idle valve to rule that out.
Also, I have stock exhaust system with rear muffler delete and pipe straight out the back. I noticed when it idles it sounds a bit like a V8, and not much in the way any exhaust pulses (just a very light exhaust flow almost like a person just exhaling). We always noticed that after a decent drive, when you pull into the garage it smells quite hot from the area of the catalytic converter. Wondering now whether the cat might be partly blocked? Time to swap in a gutted one and test that theory too.
Guess I could easily swap the fuel rail and injectors from the 93 sedan donor car and see if that makes any difference. Some day I’ll get this thing running perfect LOL!