Cyl #4 Misfire

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Mar 14, 2004 | 11:20 AM

Big Mike F150

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From: Houston

Cyl #4 Misfire

I keep getting a Cyl 4 misfire on my '98 F150 4.6L V8. I can feel it in the engine when I'm driving so I know it's there. Plugs and wires were replaced about a month ago and it was running fine for about a week, then it started misfiring. I have double checked the plugs and the wires. I even bought an ignition coil pack for the side with #4 wire/plug and replaced that, and it did not fix it. I'm stumped on this.. Does anybody have any suggestions??

Mar 14, 2004 | 12:01 PM

shivelyt

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Since you just replaced the wires and plugs, I would start by replacing those first just on that cyl. I've had a new plug that was bad and it looked fine. Good luck.

Mar 14, 2004 | 08:18 PM

krunker

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From: LaGrande, OR

I had a similar problem where I replaced the wires and about two or three days later a misfire developed. Messed with it for about a week and took it to the dealer. Turns out one of the plugs had a cracked insulator and was arcing on the block. Can be pretty hard to see.

Mar 14, 2004 | 09:52 PM

Big Mike F150

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From: Houston

Thanks. It seems like the cheapest and best route to go thus far. I'll let you know what happens.

Thanks again.

Jan 1, 2008 | 11:35 AM

Nezzer6

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put some sealant around the outside of the boot, keeps the moisture from the ac compressor out. that kills em.
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94 ford f-250 4x4 7.3 diesel auto tranny rebuilt by myself
97 f-150 305 auto
01 excursion 4x4 v10
84 f-150 351 winsor 5 speed

Jan 1, 2008 | 05:07 PM

LxMan1

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From: Louisville,Ky.

Make sure the heater hose isn't dripping into the plug pocket. Common on these trucks.

Jan 2, 2008 | 04:37 AM

vze2sgxa

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From: Where the war is...

What wires are you talking about replacing?

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Jan 2, 2008 | 06:14 PM

vze2sgxa

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From: Where the war is...

Quote:

Originally Posted by LxMan1

plug wires. 97/98 4.6L have coil packs, not COP's.

You mean, the 4.6L engines have full-up actual old style plug wires coming out of the top of the coil packs? Guess I was just confused. The 5.4 doesn't have wires, but I get the 4.6 does.