[Motornoggin]

I told you guys I would try to keep you informed of the progress of the Yellow 4-banger. I had to be down at the shop this morning anyway, so I took the computer with me so I could try to do a bit more tuning on the EFI. I have been having trouble with it. WAY too rich at idle and WAY too lean anywhere else and could not seem to get around it. Turns out I had the MAP sensor hooked up to the wrong vacuum source and I was not getting a good reading. I corrected that and still could not get it running right!
So, today I started from scratch with a completely new fuel map for a milder engine (higher vacuum reading). Loaded the map and fired 'er up, and... Still too rich... D'OH! Well, it was too rich, but it was running better so I leaned the entire map out by 10%, then another 20%, then another 20%, then yet ANOTHER 10% By now it was running a whole lot better and I was feeling a whole lot better about it. It was idling great at 1200 rpm in open loop so I left it there and started tuning the acceleration side. I have it so it will not stumble off idle or from any steady rpm (similar to correct accelerator pump setting on a carb), but I still have a bit of lean bog under load (quick W.O.T. snap). I think I have it figured out, but I noticed the valve cover was leaking pretty bad, so I shut it down until I get the leak fixed. I went ahead and installed the convertible top bows/mechanism while the engine cooled off. Overall, a productive day.

Never trust a fart. They sometimes suprise you.
http://community.webshots.com/user/motornoggin

[Motornoggin]

I told you guys I would try to keep you informed of the progress of the Yellow 4-banger. I had to be down at the shop this morning anyway, so I took the computer with me so I could try to do a bit more tuning on the EFI. I have been having trouble with it. WAY too rich at idle and WAY too lean anywhere else and could not seem to get around it. Turns out I had the MAP sensor hooked up to the wrong vacuum source and I was not getting a good reading. I corrected that and still could not get it running right!
So, today I started from scratch with a completely new fuel map for a milder engine (higher vacuum reading). Loaded the map and fired 'er up, and... Still too rich... D'OH! Well, it was too rich, but it was running better so I leaned the entire map out by 10%, then another 20%, then another 20%, then yet ANOTHER 10% By now it was running a whole lot better and I was feeling a whole lot better about it. It was idling great at 1200 rpm in open loop so I left it there and started tuning the acceleration side. I have it so it will not stumble off idle or from any steady rpm (similar to correct accelerator pump setting on a carb), but I still have a bit of lean bog under load (quick W.O.T. snap). I think I have it figured out, but I noticed the valve cover was leaking pretty bad, so I shut it down until I get the leak fixed. I went ahead and installed the convertible top bows/mechanism while the engine cooled off. Overall, a productive day.

Never trust a fart. They sometimes suprise you.
http://community.webshots.com/user/motornoggin