got codes for misfire on 5, 6, 7, and 8 as well as code for random multiple misfire and running lean
have been driving through a lot of snow in the last day or two which actually plugged my air cleaner badly! so i cleaned and dried it and ran my truck for a couple hours until engine/plugs etc was all dry, tried driving it and still got the same codes again
im not sure where to start, is it possible to be a fuel issue or sensor, being that i keep having misfires on the same 4 cylinders only?
I've had the same problem....It's a code that is very vague, You could either have a leak at the header gasket, a leak in the exhaust pipe, or your oxygen sensors may need to be replaced, or your spark plugs and wires need to be replaced. Sorry I couldn't be of more help!
cams never been messed with... that side of the engine may have been a bit wetter than the other... guess i could quit being lazy (but its frickin freezing cold out! and no heat in shop) and pull the plugs to see if water got down there... but pulling a couple of the boots showed no water signs after it dried...
one other note...
the gas cap makes a crazy sucking noise and growl every couple minutes and i can definately smell the extra unburnt gas
yep, knew that about the coil packs so i didnt really suspect them but i found something...
i used a flashlight and looked down the plug holes and found water i guess not enuff water to wet the boots but there is water sitting in bottom...
new problem... how to get it out?!
seems simple but i thought after idling for 2 hrs or so, it would have evaporated any sitting water but i guess it didnt... i have no heated shop and its freezing out so i dunno... sop it up as best i can with a cloth and let it run longer to keep from icing i guess unless someone has another better idea?
dont forget those cylinders arent firing so there isnt really any heat to evaporate the water. take a blow gun and blow the water out. and if it still misses then replace the wires and if plugs are in rough shape then i'd do them too. and dont forget dielectric grease in the wire boots
Instead of double posting in a thread that's been dead for 6 years, you should have started your own thread and provided a LOT more details.
Anyway, if the CEL is flashing, that's a misfire. See if any codes got set. You probably got the COPs wet, and who knows what other electrical connections. COPs hate water. Pull all of them and dry them out, blow any water out of the plug wells, and reinstall the COPs with dielectric grease.
2003 F-150 XL RCSB 2wd 4.2 M5OD 3.55 LS
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