Ok, adjusted allen head set screw on side of ISC, with ISC on bench, blowing through top hose (good lungs, lol) closed screw CW until very little air was able to get through while blowing. Put back on car but unplugged electrically.
Started car, engine was very shaky, I forgot RPM's at that point. I just let it run like that for a while. P0300 stored, I thought it was because idle air bleed screw was set incorrectly so I played with that for a while but engine just didn't sound right. I then took spark plugs out and tips were charcoal black. I assume from running rich before I got the good MAF. I cleaned the tips with thinner a brass wire brush and sand paper. Put spark plugs back, started car, engine ran smoooooooth.
Reset CEL, and kept adjusting air bleed screw to 600 rpm with ISC unplugged. Engine ran smooth no matter in what RPM it was. Even down to 500.
I set it at 605 rpm's and then plugged ISC. Waited a new minutes but idle never went up. Engine was already above 187 F. I thought I might have tighten the allen set screw on the ISC too much so I started loosing it a little (kind of difficult to do when ISC installed on engine but doable if 5mm "L" shape allen key is cut down so the back doesn't hit TB)
Adjusting the allen head set screw on ISC only caused an effect when turning CW (RPM's decreased), I stopped messing around with set screw on ISC and adjusted air bleed screw on TB until I got around 800 rpm.
Idle never lost control again, took the car out for a spin (around 10 miles) high loads, and neutral for around 1/4 mile until stop sign, as soon as I let go the gas pedal idle went right back down to 800 rpm and stayed there.
Back at home I pinched the hose of ISC and made rpm's decrease, however unplugging electrical connector on ISC did not cause RPM's to decrease. Still idle keeps holding steadily around 800 rpm, no hesitation or erratic idle.
My engine reaches closed loop in 13.999 seconds =P LOL, what a difference! At this point I'm still unsure whether ISC is functioning right but at least I think the Geo will pass NY State inspection now and will stop burning gas like a V8. I hope no major damage was done to the CAT all this time, oh yeah-no more black smoke.
Started car, engine was very shaky, I forgot RPM's at that point. I just let it run like that for a while. P0300 stored, I thought it was because idle air bleed screw was set incorrectly so I played with that for a while but engine just didn't sound right. I then took spark plugs out and tips were charcoal black. I assume from running rich before I got the good MAF. I cleaned the tips with thinner a brass wire brush and sand paper. Put spark plugs back, started car, engine ran smoooooooth.
Reset CEL, and kept adjusting air bleed screw to 600 rpm with ISC unplugged. Engine ran smooth no matter in what RPM it was. Even down to 500.
I set it at 605 rpm's and then plugged ISC. Waited a new minutes but idle never went up. Engine was already above 187 F. I thought I might have tighten the allen set screw on the ISC too much so I started loosing it a little (kind of difficult to do when ISC installed on engine but doable if 5mm "L" shape allen key is cut down so the back doesn't hit TB)
Adjusting the allen head set screw on ISC only caused an effect when turning CW (RPM's decreased), I stopped messing around with set screw on ISC and adjusted air bleed screw on TB until I got around 800 rpm.
Idle never lost control again, took the car out for a spin (around 10 miles) high loads, and neutral for around 1/4 mile until stop sign, as soon as I let go the gas pedal idle went right back down to 800 rpm and stayed there.
Back at home I pinched the hose of ISC and made rpm's decrease, however unplugging electrical connector on ISC did not cause RPM's to decrease. Still idle keeps holding steadily around 800 rpm, no hesitation or erratic idle.
My engine reaches closed loop in 13.999 seconds =P LOL, what a difference! At this point I'm still unsure whether ISC is functioning right but at least I think the Geo will pass NY State inspection now and will stop burning gas like a V8. I hope no major damage was done to the CAT all this time, oh yeah-no more black smoke.
1996 Geo Tracker, CAMI, 16 valve, 5sp, 4x4, soft top, 2 door, no a/c