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I have a 2006 Ford Focus with 98,000 miles on it. Every now and then the card will turn over but not start. The first few times this happened it would start 5 minutes later, but the last time that was not the case. I was worried I flooded the engine trying so I went ahead and pulled out the spark plugs to smell inside the cylinder (It didn't smell like I flooded it) and changed the spark plugs (since it was time anyways). After changing the plugs the car started after cranking for a couple seconds, but I find it hard to believe I fixed the real problem. Since then the car starts normally. The fuel filter was replaced less than a year ago. Does not seem to be related to outside temperature.

I'll get the battery tested, but it was replaced about 1.5 years ago. If I can't figure it out after that I'll see about getting a fuel pressure gauge to check that. With the problem being intermitten I am just not sure how to proceed. Even if I check some things it might look fine if the problem isn't acting up.
 

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If it's cranking but not starting then I don't think it would be a battery. It wouldn't just start working again if it was the battery. Sounds more like a fuel or spark issue to me. Is the check engine light on?
 

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Fuel pressure isn't easy to check with a gauge (no port, special fittings on lines).

Scan tool can tell what the sensor is reporting, only need to plug into the OBD port.
 
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