Quote:
Originally Posted by digital rules
Thanks, I was wondering what the norm was for the 1.8 liter Toyota engine. Scangauge bounces between .16 -.17 & Ultragauge .14 -.15 on my '05 1ZZ-FE.
Does your idle gradually drop to a low point & then exhibit a slight roughness? I always assumed the mixture was intentionally leaned out by the computer to improve idle FE. I recently replaced my intake manifold gasket & idle quality/ low end torque have noticeably improved but still not a silky smooth idle like a Honda 4 banger. MPG seems better too-425 miles & still a little over 1/4 tank left.
|
Yea it does, the mixture is most certainly not being leaned out. The 1ZZ ECU runs rich if stumbling below idle speed, stoichiometric all conditions from idle up to ~4500rpm or so, and then open loop from there on at high throttle position.
The idle isn't as good as a Honda because the cams are single profile. The 2ZZ has a better idle than the 1ZZ, 7.2mm lift vs 9.4/8.6 intake/exhaust I think explains it. I would love to get a 2ZZ + C60 combo, raise the compression, custom grind the low cam for increased duration and fuel economy, but no money
