P0171 P0174 Too Lean FIXED!

1999 Ranger 4.0L V6

Thanks for the help here on the forums.
Carquest was the only store with JUST the upper intake manifold gasket.

Being an amatuer, I was nervous. It all went well. I pulled up the intake manifold and found NO gasket left! I cleaned it up carefully and installed the new gasket. It took about 30 minutes for me. No more codes. I heard right off a different running engine. No Whooshing sounds. Also, it Idles perfectly now...no more jittery, jumping at the stop sign.

Automotive Forums saved me a bunch of money! Thanks to all your advice here.

2001 Explorer Sport 4.0 4X4 I just had thoses two codes cleared Bank 1 & 2 too lean. I did plugs n wires and noticed a signifigant difference in the way it runs, its been about 4 days and no check engine light back yet. But i have noticed lately a rough idle on freezing cold start-up also seems to me like the idle jumps way too high up when first started. Goes up to about 2000-2500rpm then rests around a grand or a little better. Were you having any of these issues, or do you think i have a sensor issue. Any help at all will be greatly appreciated.

Mr. Moen, your the man! Thanks for getting back to us..


1999 Ranger 4.0L V6

Thanks for the help here on the forums.
Carquest was the only store with JUST the upper intake manifold gasket.

Being an amatuer, I was nervous. It all went well. I pulled up the intake manifold and found NO gasket left! I cleaned it up carefully and installed the new gasket. It took about 30 minutes for me. No more codes. I heard right off a different running engine. No Whooshing sounds. Also, it Idles perfectly now...no more jittery, jumping at the stop sign.

Automotive Forums saved me a bunch of money! Thanks to all your advice here.

No, I didn't run into that problem. My engine would idle really bad. It never quit running. The gasket I changed was almost totally worn away. Not much left to clean off!