Re: P0171 bank 1 too lean

Isaac Montara  <IsaacMontara@nospam.com> wrote:

I have a Mitsubishi Lancer ES early 2000s with a P0171 that keeps coming
back after I reset it with an OBDII hand-held code reading tool.
>
I put new spark plugs in and it still sets the P0171 bank 1 too lean.
When it idles, it often kills the motor so it's not getting enough fuel I
think.

Why plugs?  That's not likely to be related in any way, it is not like you
are getting a spark error.

Your first job is to figure out if it really IS too lean or if the computer
is deluded. 

You need a real scan tool so you can see if the other bank is being
forced too rich or not.

With an inline engine where everything is one bank you can smell the
exhaust and tell if it's too rich or too lean, but you're going to need
the proper tool for this one.

How do I increase the idle RPM on an early 2000s Lancer ES?

Why would you want to increase the idle RPM?  If the engine really IS
running too lean, that's a good way to burn some valves.  On the other
hand if the engine is running rich and the computer thinks it's too
lean, that also does nothing to help the problem.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."