Having issues with loss of power above 60 miles per hour. It will run all day under 60 miles per hour. No local mechanic will work on it. Need help.

 

Why won't they work on it?
Is it breathing ok?

 

Most shops never learned them back in the day, don't want to learn them now, and sure don't want to have to find parts for them..

OP do you have any codes?

 

yes. PO172
I have changed every sensor on the vehicle. Evap coil solenoid, MAP sensor, intake and sensor, gas foot paddle, water temp sensor, fuel injectors, spark plugs, wires, module, O2 sensors. Air lines, catalyst converter.
I still can't find the problem.

 

Have you ever cleaned the throttle body?

 

So you replaced everything and want advise on what else to throw at it?
Have you thought about testing? Fuel pressure?

 

P0172 is a fuel rich code. That means the proportion of fuel to air has too much fuel in it.

If your front O2 sensor is functioning properly, you will likely see too high of an oxygen reading. The ECM sees this and uses the signal as feedback to reduce the amount of fuel per unit time getting to the cylinders. This, in theory is negative feedback which should reduce the amount of oxygen seen at the front O2 sensor. The ECM keeps making adjustments trying to bring the oxygen level down. Once it has used all of its adjustment range, it throws this rich code.

There are multiple causes, including a leak in the exhaust system between the head and the front of two sensor. Exhaust manifold gasket, cracked exhaust manifold. If there is a leak before the O2 sensor, you will get air sucked in as the exhaust goes by. Which means extra oxygen being read by the O2 sensor which did not come from combustion. Thus the reading for the O2 sensor is artificially high but the ECM doesn't know that so it just tries to correct whatever it sees. A failed fuel pressure regulator, often located inside the fuel filter assembly, can lead to significantly high fuel pressure which, because the ECM controls the amount of fuel by pulsing the injectors open then closed for a calculated amount of time, will lead to too much fuel getting to the cylinders per unit time and make the mixture too rich.

 

Do we know if this is a 2.2 or a 3.0 VUE? He says he changed wires, neither version has wires. One has a chain and the other a belt. No mention of timing components.

 

Got an intake leak maybe.

 

Wouldn't an intake leak make it run lean?