Pat H. of Garden Grove was frustrated with his 1994 Ford F350 Pickup. The rebuilt engine in his pickup was just two years old and now he was experiencing his check engine light coming on intermittently and his fuel consumption had dropped from 9 mpg to 6 mpg. When he accelerated he could hear a rattling sound coming from the engine.
The first steps our ASC Master Technician performed was a computer diagnostic scan. No engine related fault codes were found, so the technician expanded the testing to the engine components. Testing found that the Ford F350 timing was 20 degrees advanced when manufacturer specifications is at 10 degrees. Also detected was a vacuum leak at the PCV (Positive Crankcase Ventilation) Valve. The first steps to address the intermittent check engine light was replacing the PCV valve and set the timing to address the rattle. Also replacing the fuel filter was recommended since it should be replaced every 15, 000 miles and the technician found the condition of the fuel, when the fuel filter was removed, to be dark/black in color. The initial results from the repairs were good, but with the limited mileage Pat but on his F350 he didn’t detect additional concerns until about a month later when he experienced surging while the vehicle was under load and the air conditioning is switching vents. Pat brought his F350 back for further testing and diagnostics. The Technician’s inspection found the spark plug wires, distributor cap and rotor worn enough to be causing the surging and recommended that they be replaced, which was done. Along with make sure all the vacuum hoses were connected and tighten to address the AC switching vents.
Success was achieved with the repairs and Pat is now experiencing a smooth running truck and much better gas mileage. His Ford F350 is his work horse and is reliable transportation to take to his construction sights.