Sudden lean idle issue???
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Sudden lean idle issue???
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?
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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??
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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???
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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.
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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.....