MaKaVeLi

so i just came back from the dyno to tune my car after fixing headers leak, i was getting the code p1131 which is lack of H02s11 switches- sensor indecates lean. these code appeared after i did tune the car and discover there was a leak. any way the dyno was perfect but the code still appear !! so whats wrong !?

tbirdscwd

What are those weird spikes in the middle of the hp/tq curves? A little extra timing at that rpm LOL

WhiteFoxGT

Probably because its an auto and thats where the converter locks in 3rd. My truck has weird dips as well, but i also have a different TC (see attached pic for reference). And im sorry but those numbers seem low for a cammed car, especially torque.

MaKaVeLi

i got better numbers before i installed the gears ( about 269 rwhp ) , and from what i heard is that the gear drop the rwhp in the dyno..... thats not the case , the thing which is conserning me is the p1131 code ! any feedback please?

tbirdscwd

With an auto, it's not too low, but I would still expect higher from those cams. I didn't catch that you had CMS/VT cams in the first post. Can you take a better picture of the dyno graph that shows the numbers especially the A/F numbers. That code shows you are leaning out......what was your fuel pressure? How old is your fuel filter? Stock fuel pump

MaKaVeLi

This code appear before and after the dyno , fuel filter is new , the fuel pumb is stock , and as seen in the dyno sheet the A/F is perfect nt lean and not rich so why the code still appear?

devongarver

Dumb question...why didn't the tuner just lock the converter before the pull and pull it in 3rd....?

That's what every one of the 3 different shops I had my Ranger tuned at did. BTW those numbers make me feel better about my truck numbers lol...I was at 240hp/241tq.

MaKaVeLi

Does the 3.73 gears drop the rwhp in the dyno ?

mrtstang

I've been told that a slight hp/tq loss can occur on the dyno with numerically higher gears.

MaKaVeLi

The numbers doesn't concern me , the damn code is making me crazy !