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Check your vacuum lines this usually the cause for a surge in engine speed when idling or running.
Where are the vacuum hoses on a 1995 ford thunderbird 4.6l engine?
A vacuum leak on a 1999 Ford Ranger can be located using an automotive stethoscope. It can then be move around the engine to detect the sucking noise of a leak.
The 2002 Explorer has several vacuum lines. There are many lines in the engine compartment as well as under the dash.
where can i find a vacuum line diagram for 1989 ford 2.9 liter engine
they stems from the intake manafold then run in several places
There is a heater control valve on the 1999 Ford Ranger. There is no thermal vacuum valve on this year of the vehicle.
yes
P0171 = system too lean (bank 1). First thing I would look for is a vacuum leak. With engine running, spray carb cleaner around engine at suspected areas (vacuum lines, intake manifold gaskets, throttle body gaskets, etc). When you hear the engine rpms increase you have found a vacuum leak.
If you are debating on whether or not you want to buy a Ford Ranger, then it is useful to know the engine size. The Ford Ranger is available, with a V6 engine.
VACUUM-diagram FORD 2.9 l V6
What is a a/cl dv on a 1992 ford ranger xlt vacuum line