It is working fine. It will go from rich to lean back and forth under cruise. It is showing you the computer is constantly correcting to keep the engine in the best mixture for economy and emissions.
It is working fine. It will go from rich to lean back and forth under cruise. It is showing you the computer is constantly correcting to keep the engine in the best mixture for economy and emissions.
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
Are Ya Sure It Usually Goes From 14.3 To 14.8 At Cruising ,not 14 -17 Cruising .then When I Let Of It Goes Crazy Lean .
Originally Posted by GMCwantsLS1
GM has this thing cause DFCO, decel fuel cutoff. The pcm cuts fuel while coasting and no throttle, so you'll notice the gauge go lean, that is perfectly ok. During crusing, it's ok for the gauge to go up to 17, it won't hurt anything. The important part is to be sure the gauge goes rich under boost.
I run my av at 15-17 a/f ratio while cruising and it gets great mileage and has been fine for about 45K miles.
Think about this, GM doesn't allow some of their trucks to richen up over 5K and after 5secs of wide open throttle.
The sensors seem to be more accurate if they have a nice steady flow of air going over it, and steady stream, like under throttle.
hope this helps,
allen
Nelson Performance
FastestTruckList.com
NP on Facebook
Youtube Channel
'94 Chevy Truck: 8.9 et, 408 twins
Posting Permissions
Reply With Quote
