Part throttle to ¾ hesitation, no codes , almost felt like a cvt issue.
passed volumetric efficiency test ( liter times 40 in grams per second)
long term fuel trim at part throttle was -17 , rear o2 read .1v.
this meant front air fuel ratio sensor over reporting
replaced front air fuel ratio sensor , long term fuel trim zeroed out and rear o2 went to the magic number of .7 v.
hope this will help some one
happy holidays .
Tailpipe readings with a 5 gas would have been interesting…..
During the part throttle what was the reading on front oxygen sensor? Thanks for the write up
…passed volumetric efficiency test ( liter times 40 in grams per second) I've never heard of that rule of thumb. Here's a screenshot of some known good values. It looks like the real world data is fairly different than using that rule. Would you agree?
Steve, SMP teaches it. Actual rule is, supposed to see minimum 40X engine size at WOT at 5000 rpm. Your screen shot doesn't have the required info to compare/contrast the teaching. Since SMP teaches it I suspect it comes from JW (of GM and iATN fame) since he runs the course content over there. Non turbo of course.