My 05 V6 F150 update

37chief · Jan 8, 2019

I posted Sunday I almost didn't make it home. The motor was running so bad. Sunday after noon it ran fine. I had my friend bring a scanner to check for codes. No 3 misfire came up. The code must have been stored in the computer. I think I will change plugs, and wires. It's 14 years old, with 85 K. Any suggestions for plugs, and wires for the V6. Thanks, Stan

David G · Jan 8, 2019

Does it not have coil packs?

rustred · Jan 8, 2019

sure sounds like a coil to me, but don't know if that year had individual coils for each cyl. pretty sure wires are not the problem. I know I had coil problems with a ford 1/2 ton from work. exactly what mine was doing. just out of the blue start missing. don't know whats in it for plugs so check with the dealer or napa or such outfit... they know.

Philip d · Jan 8, 2019

That?s my guess too if it has them

David G · Jan 8, 2019

I looked it up, has coil packs, no plug wires, doubt bad plug, replace that one coil pack and try it.

sourgum · Jan 8, 2019

Had a misfire cylinder 1 trouble code on ours couple years ago. Generally only at higher engine speed.Replaced all spark plugs few days later. End of misfire problems. Engine ran perfectly. This was an engine with conventional core spark plugs and coil packs not the new 100,000 mile spark plugs.Check the miles on the sparks plugs since last change.

4play · Jan 9, 2019

That engine has 3 coils but its all in one "pack" each coil fires 2 cylinders (waste spark). Without testing spark and spark quality then its a guess what is causing the misfire and it might not even be a part of the secondary ignition. If you are sourcing parts locally I would stick with motorcraft if available, if not get the higher quality plug wires with platinum or iridium plugs.

Gambles · Jan 9, 2019

You sure about that? More than likely this truck has a single coil with six terminals and plug wires.
The 2005 4.6 and 5.4 would have the individual coils. The V6 would have plug wires.

Hobo,NC · Jan 9, 2019

https://www.amazon.com/Motorcraft-DG532-Ignition-Coil/dp/B001SPT804

OEM for the spark plugs...

Coil pack pick your poison...

Spark plug wires Napa belden are OEM... For sure nuttin else are you will suffer from your poor choice...

As I stated before match OEM spark plug routing the passengers side is a mess its EZ for a wire to touch the exhaust manifold and burn a wire up

....

jimg.allentown · Jan 9, 2019

Bear in mind that there are more things than plugs and wires that can cause a misfire. A bad injector, a bad intake manifold gasket, or even a burned or sticking valve.

At that mileage a set of plugs is in order. Wires are 8mm silicone wires that are designed to last the life of the vehicle (according to manufacturer). But, if they show signs of deterioration, it would not hurt to replace them.

This engine uses a coil pack for the whole engine. I have not encountered any bad ones, but I suppose it could happen. More likely not. It is an expensive part generally costing around $75.

Also, be sure to set the plug gaps before you put them in. Contrary to popular belief, they do not come properly gapped.

casecollectorsc · Jan 9, 2019

My 04 Dodge pickup with the 4.7 engine threw a mis-fire code. Wound up being a blown head gasket on one cylinder.

Determined · Jan 9, 2019

(quoted from post at 08:43:41 01/09/19) Bear in mind that there are more things than plugs and wires that can cause a misfire. A bad injector, a bad intake manifold gasket, or even a burned or sticking valve.

At that mileage a set of plugs is in order. Wires are 8mm silicone wires that are designed to last the life of the vehicle (according to manufacturer). But, if they show signs of deterioration, it would not hurt to replace them.

This engine uses a coil pack for the whole engine. I have not encountered any bad ones, but I suppose it could happen. More likely not. It is an expensive part generally costing around $75.

Also, be sure to set the plug gaps before you put them in. Contrary to popular belief, they do not come properly gapped.

I will second what jimg.allentown has said and I will add to the list that a plugged converter can cause the symptoms you are having.

See if you hear any rattling sounds when you firmly thump the converter with the palm of your hand.

A few simple tests you can do without too much for equipment;

Start it up cold and use an infrared thermometer or even your hand on the exhaust manifold to confirm that a cylinder is not firing/not making heat.

If you have a timing light with an inductive pick up you can clamp it on each wire with the engine running to identify a no spark condition on a cylinder.

Is the converter getting real hot real fast compared to the rest of the exhaust system down stream of the converter?

37chief · Jan 9, 2019

What you are saying is the converter should be the same temperature as the rest of the exhaust system, if it gets hot real fast it is plugged. stan

Determined · Jan 9, 2019

(quoted from post at 15:53:57 01/09/19) What you are saying is the converter should be the same temperature as the rest of the exhaust system, if it gets hot real fast it is plugged. stan

More or less yes.

In extreme situations I have seen converters glowing cherry red in less than 5 minutes after a cold start.

How quickly a converter heats up will depend on how much it is restricted/plugged.

Being that you mentioned you are low on power it is possible yours is plugged enough that engine is basically trying to fart through a straw.

My 05 V6 F150 update

37chief

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David G

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rustred

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Philip d

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David G

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sourgum

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4play

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Gambles

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Hobo,NC

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Determined

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37chief

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