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27/10/2021 8:43 pm
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Hello, I have 2002 Ford Escape 3.0 v6 , 136k miles,it has been over 10 years the engine idle goes up by itself more noticeable when the car is parked or waiting at the traffic light but it’s not happening all the time, take it to the dealership two times they can’t find any thing,the check engine light never comes on, it is driveable but lack of power I still get 21 miles per gallon combine, over the years I have change many parts try to get it fix but no luck, I have change spark plugs/ all coils mass air sensor/ intake gaskets upper and lower/ pcv /egr valve/egr vacuum solenoid valve, when I scan it the long term fuel trim is negative and the short term is positive and jumping, I use the smoke machine to find the vacuum leak but it seems ok no smoke coming out, please help!
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27/10/2021 9:46 pm
Please try formating your question so it's easier to read 🙂
Negative long term fuel trim doesn't indicate a vacuum leak. The engine is running rich and it is pulling back on fuel. Your Escape is running too rich over the long term.
Have you checked your throttle position sensor? If that's bad, it can cause the random idle changes, because the computer isn't being told the correct throttle position. It can also cause loss of power for the same reason. If you replace it, replace with a Motorcraft one only.
