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View Full Version : P0507, P0171, P0174 (3.0 V-6 L81)


wfransee
12-20-2007, 05:33 PM
P0507, P0171, P0174

Had an intake manifold leak on a 2002 Vue AWD (3.0 V-6 L81) and replaced the lower intake manifold. I am now getting a very high idle (2000-2200rpm) once the motor is up to temp (runs fine cold). Cannot seem to locate another vacuum leak. Ideas?

This is a 44000 mile used motor that was installed after a rod bearing went out on the original motor. The mechanics did remove the throttle body from the previous motor and installed it on the used motor. Their justification was that TB on the pulled motor was in better shape than the used motor.

Gerry Proctor
12-20-2007, 05:57 PM
Most diagnostics are going to point to a vacuum leak but it could also be:

coolant temp sensor
intake air temp sensor
O2 sensor
baro out of range

This is where you need a professional scan tool to look at the data. For O2 sensors, if they are solidly below 300mv, then the are fine and reading a true value.