What does engine code "P0307" mean for an '01 Navigator?

Question:
While coming from ther movies last night, i got a CHECKENGINE LIGHT. Ran to AutoZone and used their code reader and got P0307 - Low compression on #7 cylinder.
Help!

Answers:

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P0307 is cylinder #7 misfire, not low compression. Low compression is a possibility but very doubtful. You have COP engine (coil on plug). Since i work at a Ford Dealer and have seen this b4, i will tell you its probably a coil and or spark plug. Its a common concern on these engines. Any questions feel free to ask.

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There could be a lot of things causing low pressure on a cylinder. Anything from a bad ring to your head gasket (head gaskets suck to replace...very expensive) I would take it to a shop. I am a receptionist at one in Wichita, but you prob aren't from around here...so look in the phone book

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misfire detected cylinder # 7

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Yes this means Low Compression, you have to have someone remove the engine and have the heads machine

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Have your mechanic check the spark plug for that cylinder also, it may be bad which would cause a misfire.

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You probably blew a head gasket on this one. The 5.4 liters are famous for this issue. This isn't going to be cheap either, as the body has to come off to replace the engine on these trucks. This happened on my work truck, a 99 Ford Econoline.

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P0307 is generic code for Misfire Detected in cylinder 7, and not for Low compression on #7 cylinder, two different things.

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Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer

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This is what you get for taking your vehicle to a parts store for diagnose rather than to a professional auto technician. A hand full of mis-diagnose with lots of wasted time. If that is the proper code you have a mis-fire on cylinder#7 which is most likely a bad ignition coil. Very common we replace dozens a month at my shop. A mis-fire code can also be caused by a dozen different other things and it should be properly diagnosed at an auto shop not a parts store.
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