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  #1  
Old 01-05-2009, 04:21 PM
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multiple random misfires on cylinder 5,6,7,8

98 F150 4X4 4.6

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?

thanks for any tips
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  #2  
Old 01-05-2009, 04:25 PM
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probably fried a coil.
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  #3  
Old 01-05-2009, 04:26 PM
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so the whole left bank is misfiring. has the cam(s) ever been messed with? did that side of the engine get really wet? is there water down in the spark plug holes on the driver side of the engine?
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Old 01-05-2009, 04:26 PM
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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!
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Old 01-05-2009, 04:36 PM
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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

forgot to mention it earlier
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Old 01-05-2009, 04:39 PM
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this all started after 4X4'n through 1 to 3 ft of snow drifts etc on my way down my mile long driveway... (including shoveling out a bit a couple times) Ford tough outdone by a couple snowflakes?? dam
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Old 01-05-2009, 04:43 PM
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Quote:
Originally Posted by Roarman View Post
this all started after 4X4'n through 1 to 3 ft of snow drifts etc on my way down my mile long driveway... (including shoveling out a bit a couple times) Ford tough outdone by a couple snowflakes?? dam
I would have to believe you got water into an ignition component and thats the source of your problem. Coils dont like being wet...
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Old 01-05-2009, 04:46 PM
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Quote:
Originally Posted by jethat View Post
I would have to believe you got water into an ignition component and thats the source of your problem. Coils dont like being wet...
both coils operate both banks. the driver side coil pack fires 2,4,7,8 while the pass side fires 1,3,5,6.
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Old 01-05-2009, 04:54 PM
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Quote:
Originally Posted by Matts ford View Post
both coils operate both banks. the driver side coil pack fires 2,4,7,8 while the pass side fires 1,3,5,6.
Then I would make sure its really dry on that side. I've never had the coil packs so I assumed they would each handle one side..
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Old 01-05-2009, 05:06 PM
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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?
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Old 01-05-2009, 05:14 PM
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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
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Old 01-05-2009, 05:14 PM


 
 
 
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