running lean

[skyy_4life]

my brother has a 1996 2.3L ranger. has a check engine light on for "running lean on bank 1"

any ideas on wut this could be

he removed his hyper chip and removed the accell performance ignition coils.

any ideas will help

 

[scotts90ranger]

my guess would be a dirty MAF, exhaust leak before front oxygen sensor (probably cracked manifold) or a bad oxygen sensor

 

[skyy_4life]

my guess would be a dirty MAF, exhaust leak before front oxygen sensor (probably cracked manifold) or a bad oxygen sensor

MAf maybe, the truck has a cold air system. that might have something to do with it. the exhaust is solid and has no broken mufflers or anything. might check 02 sensor.

 

[scotts90ranger]

I meant a crack in the exhaust manifold, or a leaky manifold to head gasket, it's rare, but any air getting in before the oxygen sensor will cause it to think it's lean

 

[BlackBII]

Check for vaccum leaks yet?

 

[skyy_4life]

Check for vaccum leaks yet?

yea theres no vacuum leaks and the exhaust is solid.
im thinking more along the lines of a bad 02 sensor or
something like that. maybe a dirty or bad MAF

 

[scotts90ranger]

a dirty MAF will cause wierd things to happen...

 

[skyy_4life]

a dirty MAF will cause wierd things to happen...

ok thanks guys. we will see wut happens.

 

[sageandpine]

I have OBD code P1163 on my 1996 XLT 4 cylinder. Checker checked it and it read the same as you're saying... lean on bank 1. Did you ever resolve it?