I have a misfire in cylinder #8, the past two have been from bad coils and I am also thinking this is another coil.

I <o></o>have an extra and decided to replace the plugs as the truck is nearing 100K miles.

<o></o>Looking at the engine from the front can someone tell me who is the #8 cylinder?

<o></o>Thanks,
John

 

4 8
3 7
2 6
1 5

Front

 

Thanks!

Here is another question, If the coil gets wet enough to cause a misfire will it still be okay after it dries out?<o ="">
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Reason for question…
I replaced a coil a while back and held onto it because I suspected it just got wet. I replaced the #8 coil with the extra I have been holding onto. I only drove it a few miles but all seems okay. The coil I removed also had water in it. I had the truck parked on a hill side and the rain came from the rear of the vehicle, I am thinking the rain got into the engine compartment.

 

It may be, I would let it dry out, then maybe stick it in a cylinder that's easy to get to and see if it works ok.

 

Thats about what I did, I removed #8 and then #1 and put #1 into #8 and replaced #1 with the one I had as a spare. Should have some idea after a week or two.

I also picked up some plugs but not sure I want to tackle that job yet. I have 95K miles so it's due.

 

I haven't done the plugs on mine yet. Only 64,500 miles, but it doesn't look real fun

 

When you say it was "wet", what do you mean? There was water in the spark plug hole and it caused a miss? Or did you take the COP off, turn it upside down and water ran out?

If it just got wet and misfired, drying out the spark plug hole, and the COP boot, and putting it back together isn't going to hurt anything.

COPs don't burn out if they misfire because they're wet, but they do crack and get wet internally, which is why I asked if water ran out of the top of the COP

 

Yeah, I have had to replace 4 cops on previous Tritons. All were due to corrosion from getting wet. How the heck they got wet is anybody's guess. I think my last V10 (1997) lost a cop after the radiator top split laterally along the top tank while towing a trailer through Nevada. The coolant bathed the engine. I suspect the coolant got into the plug wells.

I sure hope the '03's aren't susceptible as the earlier versions

 

Funny, I've gotten my 2001 V10's COPs wet lots of times. Never a problem.

Weird how some people have loads of the same problems, others don't ever have a single problem.

 

knock, knock, knock Knocking on wood, none of mine have failed

 

Wet in the boot where the spring is that goes over the plug. Not to the point where much water ran out but could see the mositure. I used compressed air and blew the sparkplug hole and the COP boot dry.

 

Well the coil did not seem to help, I replaced the coil in #8 with the coil from #1. Headed out Saturday AM and it started running rough and the CEL would either flash when not under much of a load (coasting) or would be on solid normal driving. Had the codes read again at AutoZone still “#8 misfire<o>
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Are these code readers accurate when calling out a cylinder? I may next change the #8 plug and see what happens.<o>
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Could this also be an injector problem? Anyway to trouble shoot injector without just throwing parts at it?<o></o>

Thanks,

 

Do the plug. What brand are they? Original Motorcraft/Autolite, or something else? We've found only Motorcraft/Autolite really run the "right" way in these Ford modulars.

 

I picked up a set last week they were Autolite not sure the number the parts guy looked them up. I hope to try the plug tonight, will post back with results either way.

 

Got all but one plug changed, #7 I need to find a 1/4" swivel to get to the COP hold down screw. I don't want to move the fuel rails if I don't need to. Truck is running much better only drove it a few miles, no CEL, and idles and runs smooth. #8 plug was rusty from water over time, all plugs were due by the looks of them.