Well did some more messing with it. I was reviewing my IAC (spark and fuel/air) tables with one from a stock 2002 camaro and did see some significant differences (but then again mine was based from a 1999 camaro so there could be some differences). So I pretty well copied all of the stock Camaro values over, then I also adjusted the throttle body. Cracked it 3% then reset the TPS and IAC so the TPS is reading 0 %. It did seem to want to fire much easier. Died as soon as it idled down a tad. I then added 10% to the B4343 Startup Friction airflow Decay which seemed to fire quicker but the car was just started 5 minute previous. This cold start is tricky because you don’t get very many changes before its already a bit warm. It was successful enough that I didn’t have to even get in the car and throttle it to keep the car alive.
So then I took a look into the fuel pressure. I must have set my fuel pressure last year with the reference hooked up so it was 42ish psi with the vacuum line on and around 50 psi with the hose off/kinked ( I based all of my injector rates for 43psi base). As soon as I kinked the vacuum line and started bringing down the pressure to 43psi no reference the car leaned out and stalled. So now I’m basically starting over with my VE and cranking VE. It ended up being around a 20% change in fuel pressure. Started with adding 10% to the entire VE and it ran okay but still a tad lean and sounded like it wanted to die and chugged a tad. AFR was around 16.5-17.00. So I just added another 9% to the entire VE (in theory this should bring be down to around a 14.7-15.00 idle afr). I feel I am getting closer, and my VE is looking more like a normal VE. In the 40-50s in the lower map idle ranges vs 30s like it was. If all is good I will toss an Auto-VE tune in the car tonight and take it out for a good hour or so. We are supposed to get some spring like weather today.
I will test again tonight. It was getting late and the wife put a stop to it lol.
Jay
Reply With Quote