On my 98 f 150 I keep having this problem of a spark plug going bad. It first happened a few years ago and I was told water some how got in and shorted out the spark plug. Well it didn't happen again til last year when I let it sit for about 2 wks. Started running hard, check engine light started flashing. It sounded like crap. I had all 8 spark plugs changed ran some fuel injector cleaner thru it and after a couple days it ran fine. Well Im having the same problem again. I let it sit a week and now its running like crap again. My uncle listened to it today and he said it has a bad spark plug. It starts fine, just runs rough with the check engine light flashing. Spark plugs are cheap but a pain to change. Any ideas would be appreciated.Why does one spark plug keep going bad?
Your Cylinder head gasket may have gone, common fault or it may be one of your valves a wee bit burntWhy does one spark plug keep going bad?
Check the plug color when you pull it out. Should be light tan on electrode. If it is black or oily looking, it may be fouling out due to oil leakage into the cylinder or a bad fuel injector. Check wire to that plug too. It might be bad. Good luck. Dern trucks....Why does one spark plug keep going bad?
If the check engine light is blinking it means that this is a catalytic damaging misifre, plugs are cheap cats are NOT. My advice would be to get this to a garage as soon as possible, find the color of the spark plug when you pull it out and google it, you will get a basic answer of what is on the plug and why.
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