I have a 2001 expy with a 5.4. I had a check engine light, so i hooked up auto enginuity and found that it was a p305 misfire on #5. I cleared the code and it never came back even after a 50mile drive, but at light to half throttle it will shudder. It almost feels like a torque coverter slipping in and out but at full throttle there is no shuddering. Is this what it feels like when it is misfiring or do i need to start looking into the transmission

I got home and replaced the passenger bank plugs with motorcrafts and cleaned and checked the COP's they were 1.5 ohms. The old plugs were white and the #5 looked almost rusted and dry compared to the other 3 is it possible for the injector to cause a misfire.

 

halerazor Check this thread out ~

https://www.f150online.com/forums/19...ml#post4227020

 

i'm gonna pick up a set of coils tonight and change out the other bank of plugs when i get home. I also picked up some injector cleaner and gonna fill the tank today with midgrade. It doesn't make any noticeable noises, but the cat is getting really hot like stated in that other thread.. If coils and plugs don't fix it i'll have to get auto enginuity out and start checking more stuff.

Truck has 100k on it

 

i changed out the plugs and coils, i used motorcraft plugs and granatelli hot street coils. The #5 coil was covered in corrosion. I drove it after i was done and it drove smooth as could be no more bucking so i thought it was fixed, then an hour later i started it up to pull it in the garage and it threw a CEL. I was like WTF so i took it for a drive and there was no bucking and the engine sounds and feels smooth. I'm gonna hook it to auto enginuity tommorrow and see what the code is, i switched the #5 and 6 injectors to see if they may be the problem they looked like hell. Is it normal for all the plugs to be white?

 

Those coils are junk and/or a PITA to get them to work correctly. I've heard of one instance where you had to wire in a resister somehow to get them to function correctly, - if they do at all. Regardless, don't expect any longevity out of them from these engines, - it's been tried by a few.

That may not be your problem now, -you can expect some in the future.

When you need to replace those, just ask here. Globals have the best record on coils so far. It's not a perfect one now, but it was for along time. There's been so many purchases, - it increased the chances of getting bad one x 100% compared to the competition.

So Globals have the coils, I've been running them for quite a few years.

The best coils (COP systems only) for these trucks run about $9.80 a piece. Any more than that, you getting taken.
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What you want to do now is save all your old ones. You be glad you did when the time comes.

Good luck with those Granatelli's.

 

sounds to me like you got a antifreeze leak in one of the heater core hoses above #5.

 

i knew about the globals and would have ordered some but i didn't want to drive the truck for a week waiting on parts with the engine missing. Jegs had the granatellis in stock so i went with those. I'm curious to see what the code is now, i guess i will find out tommorrow when i hook it to the laptop.

 

Don't you have a little scanner ? Much easier just to read DTC's.

 

i dont have a scanner myself, i have built up several 6.0 powerstrokes and those guys have auto enginuity and SCT xcal3 i can use to read codes. I prefer AE because i can realtime monitor every sensor and perform test

 

Number 5 is drivers side front.

 

Thats right. The antifreeze lines are on the other side 1-4.. Next time I'll have to use my fingers...

 

i found this out after i changed the passenger side thinking that #5 was 2nd from rear on the passenger side. The only engines i've ever worked on have been diesels and the cylinder numbering goes

FRONT
2 1
4 3
6 5
8 7

 

No no, that's incorrect. Here yuh go.

Front of engine is facing down. So 1,2,3, and 4 are on the passenger side. #4 is back by the firewall.

 

1998 4.6

I just had a miss under load while driving down the NJ Turnpike yesterday.
The temperature was really hot and the truck started bucking during acceleration while moving. The idle showed no sign of a missfire.

Thanks to Jbrew, I knew to look at the coil packs for this problem. I finally threw a code which indicated #5 cylinder misfire. This corrasponded to the right side coil pack, which I changed. The truck now runs better with no bucking anymore.

So lesson learned

An under load missfire is 9 times out of 10 a faulty coil.

 

scanned it today, i had a
174- right bank lean
171- left bank lean

I must of had some air in fuel lines when i took off the fuel rail. I cleared the codes and drove 50 miles with no more codes. Thanks guys