averagedude

Hey guys, just wanted to see what some of your thoughts were on where to start…..2003 XLT 5.4 check engine light came on the other day (first time it's done that in the 10 years I've had it ) hooked up the scanner and it threw a bunch of codes at me……misfire on #4, crankshaft sensor, and 3 or 4 codes pertaining to O2…..seeing as how everything popped at once it leads me to believe that they're all a result of one….guessing faulty spark (haven't had a chance to do a tune up in a while). Would you agree? If not, would very much appreciate some input on other areas to start. Thanks for any help.

Also…...Day before the light came on it was rough on the start up and sputtered a bit but eventually cleared itself.

redknight1

sounds like a misfire, was the cel flashing?

averagedude

wasn't flashing, just a solid light

redknight1

check to make sure it's not something simple like a vacuum leak or something like that. Then I would check the coil packs.

averagedude

Good point, didn't think about a vacuum leak....I'll be sure and give it a check over.....thanks!

yamahazinger

yea that sounds more like one thing caused a bunch of other sensors to trip. If it were mine id probably replace the plugs first and go from there. Try resetting your computer after the plug change and if it comes back it wasnt the plugs