my 2000 grand marquis has a trouble code p0455 has anyone know what would cause the problem. the idle has what appears to be a miss(either a fauled plug ar a bad wire

830

Asked by Oct 09, 2012 at 11:20 AM about the 2000 Mercury Grand Marquis LS

Question type: Maintenance & Repair

3 Answers

251,555

http://www.obd-codes.com/p0455

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Do you have an engine miss through out your driving range? It is possible that your spark plug boots and springs are in. need of replacement. The 4.6 L engines with coil on plugs are bad about the boots and springs fouling up, your car will intermitently act as if an injector is not firing because of this. Many people end up replacing the entire injector when indeed it is only a $5 problem instead of $50.

sulfur/rotten egg

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