My 89 when first started when cold, never stalls but bucks, burps, farts and hiccups for about 30-45 seconds until it gets some heat in it. The throttle response is also bad like a missing accelerator pump. It blows smoke and smells of raw gas. I pulled 10% fuel out of the open loop % change vs coolant temp and it got worse. Now I assume that recducing the values in this table I am subtracting fuel? It seems like its rich because of the smell and the smoke but the hesitation tells me its lean.

What is the best way to determine this on a cold motor running in open loop?

TIA guys.
Jason

 

Well, I know it may not help you right now-but a wideband is the only way I dialed mine in! I went back and forth too, and just couldn't seem to make it run decent on cold start till I hooked up the wideband, increased the closed loop timers to max and scanned it for temp at the same time-then record the f/as at temps; then adjust, wait for iut to cool and start over again....
I'm afraid any other way is hit and miss-I figured out I was going too far both directions.
If no wideband, try adjusting the open loop f/a vs coolant temp by only 2 at a time so you don't overshoot, and try try again!

 

Thanks for the reply. Did you make your own WB O2? If so, where are the directions?

 

No.....(ok, flame suits on again) I bought a wideband from www.fjoinc.com
It has input for rpm and a 5v along with the f/a and logs it. I can't do without it now!