kazfan30

iTrader: (18)

Truck has been running awesome, went to go to lunch earlier and fired truck up and exhaust sounded really flat and funny? So i glanced at my wideband and it is so lean my UEGO wont even register??? normally she idles great at 14.7-15.3 all day, any ideas why such lean idle all of a sudden, also stumbles when i drove it at lower throttle and when slightly accelerating? MAF maybe?

lownslo

iTrader: (3)

check your maf plug and clean the maf! other than that I would say 02's need to be checked. Sounds odd.

kazfan30

iTrader: (18)

Tried new MAF, same problem.... put old one back on, stumble is gone after first takeoff, only idles funny and really lean for about 20-30 sec then it starts richening back up to the correct afr? Then as i drive around its fine... kill it and fire it back up and same thing....lean and then corrects itself..Still getting lean codes 0171 and 0174 as before... could vacuum leak that i cant find get worse and cause this issue??

kazfan30

iTrader: (18)

Or could old 02's sensors cause this... any help would be greatly appreciated.

kciSS05

iTrader: (3)

My o2's jus startes goin bad as well and my truck would die when I came to a stop. Cleaned the maf and it still happened. Try changed an o2 and see if that helps!

lady3bglover

iTrader: (3)

When was the last time you filled the tank, and which octane? Reputable service station?

kazfan30

iTrader: (18)

Hmm did not fill it, but actually put gas in it today on my way to lunch!! ..was one of my 2 normal choices? and as always 93 oct... it was about 1/4 tank and i went up to 3/4 tank... could bad gas cause this???

KLUG'S SS

iTrader: (6)

I have seen bad gas do alot of funny stuff. When is the last time you changed your fuel filter?

kazfan30

iTrader: (18)

hmm bout 8k ago... actually got one today and was going to put it on tommorrow. Klug, it feels like the truck sees, or reads somethin on startup, but corrects itself after a few seconds? And after that truck runs fine, no stumble or studder while driving, seems normal??? But cut it off and fire it back up...bam..same issue flat single tone idle lean as hell.

denali_on_26's

iTrader: (26)

Odd.....mine has been doing the exact same thing for about a week now....i got gas at the exxon or whatever it is on oak grove road on the left before the turn to your work.....