Re: ford ranger rough idle p0301 and p0171
I had this issue on my 2000 Ranger with the 3.0 flex. On top of your engine
should be a sensor mounted with 2 rubber hoses running down to your EGR
tube. The sensor is called the Exhaust Gas Pressure Differential Sensor.
They are known to clog. The pain is that there is no code for this problem,
it just tells you something else, and you have to cross the ford part # to
get a new one. O'reillys got mine for me at the price of $55. Check it out..
Let me know.
"pedal tothe metal" <email@example.com> wrote in message
> It got very cold (below freezing) a few days ago (texas). The next
> day, quit suddenly, the idle became very rough - but no stalling. The
> next day the check engine light comes on (it was about time, LOL).
> Also, the rough idle doesn't seem to improve with temperature / warm
> up. Engine smooths out at higher rpms but is rough under load / high
> torque (low rpm) conditions.
> Autozone says two codes: P0301 cyl 1 misfire detected, and P0171
> system too lean bank 1.
> I'm thinking a clogged fuel injector as the common denominator from
> those codes. Does that sound right? Is it possible that some water /
> ice entered the fuel system somehow and clogged the injector?
> Vehicle is '98 ford ranger, 3.0 L, 97K miles.