Clogged or poor fuel feed --burnt or damaged valve --collapsed lifter -flat spot cam -loose damaged rocker arm--or new parts defective
SOURCE: cylinder 6 misfire for 2000 cadillac deville 4.6 liter engine
check out this tool. Brand new on the market and it quickly can diagnose a misfire from the plug or the coil pack. Here's their website
SOURCE: cylinder 8 misfire, restricted performance is also coming on
you may have to replace the cowl pack itself that sit on top of the spark plug and sometimes you can get by just changing the boot wish you the best of luck Michigan Man.
SOURCE: i have a 99 grand am SE 2.4 4 cylinder and my
A misfire doesn't always have to be ignition... it's just the most common cause. Faulty or plugged injector, low compression. You need to check fuel pressure and test the fuel injector flow. Then check compression. If you don't have tools for these tests, take it to someone who does. Testing is much cheaper than throwing parts at the problem.
SOURCE: diagram of spark plug
Check this for 4.6 or 5.4 sizes engine...
2004 Ford Expedition 4.6 liter V-8 VIN "W"
2004 Ford Expedition 5.4 liter SOHC V-8 VIN "L"
Hope this help (remember comment and rated this).
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