If you have a p0171/174 more than likely your low grade misfire is caused by a vacuum leak. Which is possibly the elbow at the back of the intake for PCV.

As far as weaponX coils are concerned, I am running them and they are 10x better than the factory design. The seal much butter around the intake and actually snap on to the plug.

 

the "lean bank" CEL codes I used to have are no longer there since the intake manifold was replaced.

I replaced the COP and the spark plug for cylinder #4 and that CEL has gone away..... only to now have a "cylinder #5 misfire" and the P0316 error code to go along with it.

At this point, I'm guessing it's a safe bet that the other 7 COP's should just be replaced given the truck is sitting at just over 206,000 miles and i'm having this type of issue. I'm open for suggestion if y'all think something else may be occurring.

 

Yea, best answer, -

Your on the right track, post ALL your DTC's. What's #5 ? Need that one to make a proper determination.

I got the 316 info, -

P0316 Misfire Detected On Startup (First 1000 Revolutions), so which DTC for #5 ? It matters.

Follow instructions that I've posted previously ^^ up further.

 

A individual misfire code is 305. The 316 is a multiple misfire on startup. To the op let the truck sit a couple if possible. Then have someone start it while you watch for blue smoke. You may have leaky valve stem seals that is what would cause a 316. If you dont see any blue smoke you need to replace the other coils. Depending on budget I prefer WeaponX street coils. For the price and reliability they compare to the factory Visteon coils. But that is my opinion.

 

Oh was it? Yea I didn't catch that, still don't see it. I was looking for DTC confirmation since he had the 316. It's possible to get that wrong, -
you know, 305 or 355 are both misfire DTC's. Guess it was too difficult for the user to confirm or write out the DTC....iduno. I do know it matters. Circuit, Primary, Secondary... No big deal, - if they don't want to work with yuh, what can you do but guess.

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So no problems with Weapon X ? Like em ? Notice anything different ?

 

I have the Weapon X Street Level 1's on the 03. They are great no issues and have close to 80k miles on them now. The truck consistently gets around 15mpg around town and 18-19mpg @ 70 on the interstate. Its a 5.4/4R70W SCAB 4wd with 3.73's.

I have the EFX2 in the 97, but its performance oriented and mileage doesnt mean a thing. The truck runs smoother and it has a better burn. The EFX2 helped free up around 12rwhp with high compression.

The only downside is they are a complete pain in the *** to remove even with dielectric grease around the head seal. The brass ends that snap on the plug with limited room to grab them makes it a troublesome when time to change plugs. Mind you I'm **** about maintaining my trucks. I chang plugs and filters every year regardless of mileage. Its mostly due to the trash in todays fuels.

 

Sounds like a bother, - but if the seal is good... -probably be willing to put up with it. I can't remember, are the connectors solid (like Granitelli's) or do they use the common spring and ferrit rod caged up in the middle?

That's some great mileage. When I went thru mine at 185,000, coils, injectors, O2's, Denso's and what not I was getting a strait 16mpg for awhile. It was 16 mpg's city and highway for some goofy reason. That's running the speed limit. It didn't last however. Last checked I was at 13. Yea, your not kidding about the crap petrol these engines have to put up with. Hard to believe they run lol.

 

Haven't circled back to this thread until now... the code i'm getting for cylinder # 5 is P0305 - "Cylinder 5 Misfire Detected"

 

Just thinking out loud here...

Could a crankshaft or camshaft position sensor be the culprit in all of this? I have no CEL codes for it currently but was curious what y'all's thoughts might be on it.

 

Nope. Not if it runs.

You find a good deal on coils yet? Need help?