I have a 1999 F-150 with a 4.6 L Triton engine which misses under highway load.Dealer diagnostics prteseneted codes P301, P302, & P303.Right valve cover reportedly leaked causing plug wires rto short.All plugs and plug wires were replaced and tuneup performed.Engine continues to miss under highway speed load.It feels like a centrifugal advance failure of old.Recommendations please!
Optional Information: Year : 1999Make : FordModel: F-150Engine: 4.6 liter Triton Already Tried: Engine missing under highway speed load. 93,000 + miles on vehicle. Dealer diagnostics reported codes P301, P302, & P303 and found right bank valve cover leaking and shorted out plug wires. Dealer replaced all plugs and plug wires, and performed tune-up. Vehicle still exhibiting severe missing under loading. Sounds like vacuum advance problems of old. Please provide recommendations!
HiCustomer
Thank you for asking your question on JustAnswer, my name is XXXXX XXXXX X will be assisting you today with your question. The most common cause of the problem you are having is a defective CMP (Camshaft Position Sensor), I am sending you instructions in pdf format, hope this helps you out.
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Experience: 16 years experience Ford,Nissan and Honda dealership in all areas