Hi guys,
Ok, I'm back with another FAST question. Things are going better, but this one has me a little baffled.
I've been struggling with my cold vs. warm idle VE settings. If I get the car warmed up and set the VE entries to match my desired AFR numbers (about 13.6:1 at IDLE), it idles great with very little O2 correction in closed loop. The VE numbers are in the 45-46 range around the IDLE entries.
After doing this, I turn the car off, let it cool, and restart. Now, when it's cold, it won't idle well at all! It 'hunts' for it's idle point, and the O2 is reading 15.94 (max lean). I have to keep blipping the throttle to help keep it running until it gets a little heat in it. Once it goes closed loop, I see it adding a large amount of fuel which helps. Then, finally, once things warm up, it stabilizes where I had set it previously.
The condition was so bad that I added fuel to the VE tables (up to about 52 around IDLE). Now, when I start it, it will still hunt slightly, but nowhere near as badly. But once the engine warms up, it's pulling about 14.9% fuel to get close to my 13.6 AFR that I requested.
I have experimented with the After Start tables somewhat, but I'm not sure if I'm doing the right things there... I feel like I would rather lower the VE numbers for the hot conditions and work with these tables for Starting. But how much fuel should I add? Or should I be adding to the Warm-Up Enrichment vs. CTS table instead? I haven't experimented much with this table yet...
Anyway, where is the best place to work to 'fix' the problem I'm seeing (too lean when cold).
THANX!
Bryan
Ok, I'm back with another FAST question. Things are going better, but this one has me a little baffled.
I've been struggling with my cold vs. warm idle VE settings. If I get the car warmed up and set the VE entries to match my desired AFR numbers (about 13.6:1 at IDLE), it idles great with very little O2 correction in closed loop. The VE numbers are in the 45-46 range around the IDLE entries.
After doing this, I turn the car off, let it cool, and restart. Now, when it's cold, it won't idle well at all! It 'hunts' for it's idle point, and the O2 is reading 15.94 (max lean). I have to keep blipping the throttle to help keep it running until it gets a little heat in it. Once it goes closed loop, I see it adding a large amount of fuel which helps. Then, finally, once things warm up, it stabilizes where I had set it previously.
The condition was so bad that I added fuel to the VE tables (up to about 52 around IDLE). Now, when I start it, it will still hunt slightly, but nowhere near as badly. But once the engine warms up, it's pulling about 14.9% fuel to get close to my 13.6 AFR that I requested.
I have experimented with the After Start tables somewhat, but I'm not sure if I'm doing the right things there... I feel like I would rather lower the VE numbers for the hot conditions and work with these tables for Starting. But how much fuel should I add? Or should I be adding to the Warm-Up Enrichment vs. CTS table instead? I haven't experimented much with this table yet...
Anyway, where is the best place to work to 'fix' the problem I'm seeing (too lean when cold).
THANX!
Bryan