Question about 2003 Ford Expedition

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I have a 2003 Expedition 5.4L Triton. Two days ago, with low gas (38 miles to empty), engine started running rough. Code read P0302, misfire cyl. 2. Since it had 113K miles, I figured its time to change the plugs. Did that, and then got 4 codes. 0300 (random misfire), 0302 (cyl 2), 0304(cyl 4), 0171(running lean, bank 1). Then I changed all the boots and springs, and checked that plugs were all secure. Same thing. Changed PCV valve, air filter, fuel filter, and put Lucas fuel injector treatment in tank. Got rid of 0171, but misfire codes still there. Running rough, loss of high end power. Is this the injectors or coils?

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Most likely the coils. Easiest way to check is swap them with another cylinder, start it, pull the plug wire connecter and if it doesn't change the engine the coil is bad. If it is the injector, then you can check it with an ohm meter. Touch the leads in the injector it should read 11 to 15 ohms. if you need help let me know.
Randy

Posted on Dec 02, 2010

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