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This car had multiple problems. In this particular video I will be showing you the cause of fixed lean oxygen sensor signals (both banks) and very positive STFT and LTFT numbers. I will also show you how to use fuel trim after the repair to determine if you have any other problems.

View More About This Video: Mercury Cougar high idle speed, lean condition P0171, P0174

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This is a Ford Expedition 5.4 with a vacuum leak causing "System Too Lean" trouble codes P0171 and P0174. In this video I will show you how to use freeze frame data and fuel trim numbers to identify a vacuum leak. Then I will be using water to locate the specific area of the vacuum leak.

View More About This Video: System Too Lean (P0171, P0174) - Vacuum Leak Quick Test - Ford 5.4

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This vehicle came in with a long history, a severe misfire complaint that two shops couldn’t fix, and lots of parts changing along the way.

View More About This Video: 2002 Ford Escape 3.0 Misfire - ignition coils connected wrong

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The method of timing verification shown in this video can be used on any car.

View More About This Video: How to check for a jumped timing chain or belt