GEN 2 Engine misfire message

[MGD]

Misfire just occurred this morning. Using SP542's and all gapped at .028. Went almost 800 miles with no issues. Damn it!!! It's not the plugs. Starting to believe Smokeshow....it's a ghost.

One thing to keep in mind is that the ecoboost does use up spark plugs faster than other engines. My guess is that your gap has opened up just enough to create the misfire under the right conditions. There is a current post here where someone recommended going to .025.

 

[10SpdsOfFury]

My truck has been perfect until Monday morning, I got the dreaded misfire message. I have 7000 miles on it and last week I decided to be proactive and have the dealer flash my ECM to the newest version. On Saturday I installed my Whipple Intercooler/ cold air and also put new plugs in gapped at .025, I haven’t got my tune yet but the truck ran like a beast all weekend . I Cleared the code and it was fine for a day then came back on when I got on the hwy.

 

[SJRaptorG2]

Jacob, I pulled the plugs and put in six (6) new SP542 gapped at .028". Guess what I pulled out of the truck? SP550 plugs gapped at .028". Coloring on all was pretty good. I thought the 17' Raptor was coming with SP534's? So, I just went to a hotter plug, right? Thoughts?

---------- Post added at 01:54 PM ---------- Previous post was at 01:34 PM ----------

Jacob, check that. My truck has 1,700 miles on it. The ring around the bottom of each plug DOES have slight carbon buildup. Enough to where with my fingernail, I can chip it off in a light flake. Again, I am no mechanic, but carbon build-up is just the place for pre-detonation to occur, isn't it? I don't pull plugs often and certainly not on a vehicle with 1,700 miles on it, so I don't know what a turbo vehicle plug should look like. This is a new truck, I haven't really hammered the throttle except a few times and that was recently. In fact, it's largely been driven down the highway on cruise control. I nursed the vehicle for the first 1,000 miles to ensure good break-in. Not sure this information helps or not, but thought I would throw it out there.

2017 Raptor Manual calls for SP534s, however Ford changed them to SP550s. see my post on this:

http://www.fordraptorforum.com/f260/ford-changed-spark-plug-part-number-56220/

I only had 1 issue with a misfire code and that was after installing a boostmax. I took it off and everything is fine. My truck has 30,000mi and no problems. The ecoboost HO seems to be finicky when it come to mods.

 

[dude1782]

One thing to keep in mind is that the ecoboost does use up spark plugs faster than other engines. My guess is that your gap has opened up just enough to create the misfire under the right conditions. There is a current post here where someone recommended going to .025.

I heard you can drill an 11/16" hole directly into the intercooler to prevent misfires

 

[RobertH6657]

One thing to keep in mind is that the ecoboost does use up spark plugs faster than other engines. My guess is that your gap has opened up just enough to create the misfire under the right conditions. There is a current post here where someone recommended going to .025.

I now have 8 misfires with less than 2,500 miles on my 17' Raptor. Do gaps on plugs open up after only 800 miles on them? I have had these SP534's in the truck for a little over a month now gapped at 0.028. The CEL indicating misfire continues to be in Blank 2 (I think that is Driver side cylinders). However, when I had the SP550's (original set), EVERY time the CEL turned on indicating misfire was initially (and I mean right) at start-up of the engine when the engine was cold. Every time. With the new SP534's in, every time the CEL lights up indicating misfire, it is within 1 minute of cold engine starting. Has never happened on a warm engine start. And it happens with hardly any load on the engine. Like less than 20MPH and slow almost idling through the neighborhood to get out of the neighborhood - driving. I run 92 octane in it. Should I try to put the old 550's back in and gap them at 0.025"?? Thoughts?

 

[MGD]

I now have 8 misfires with less than 2,500 miles on my 17' Raptor. Do gaps on plugs open up after only 800 miles on them? I have had these SP534's in the truck for a little over a month now gapped at 0.028. The CEL indicating misfire continues to be in Blank 2 (I think that is Driver side cylinders). However, when I had the SP550's (original set), EVERY time the CEL turned on indicating misfire was initially (and I mean right) at start-up of the engine when the engine was cold. Every time. With the new SP534's in, every time the CEL lights up indicating misfire, it is within 1 minute of cold engine starting. Has never happened on a warm engine start. And it happens with hardly any load on the engine. Like less than 20MPH and slow almost idling through the neighborhood to get out of the neighborhood - driving. I run 92 octane in it. Should I try to put the old 550's back in and gap them at 0.025"?? Thoughts?

Yes, that would be a good next step. Not sure why this engine is so picky with spark plugs and gap.

 

[smurfslayer]

I now have 8 misfires with less than 2,500 miles on my 17' Raptor. Do gaps on plugs open up after only 800 miles on them? I have had these SP534's in the truck for a little over a month now gapped at 0.028. The CEL indicating misfire continues to be in Blank 2 (I think that is Driver side cylinders). However, when I had the SP550's (original set), EVERY time the CEL turned on indicating misfire was initially (and I mean right) at start-up of the engine when the engine was cold. Every time. With the new SP534's in, every time the CEL lights up indicating misfire, it is within 1 minute of cold engine starting. Has never happened on a warm engine start. And it happens with hardly any load on the engine. Like less than 20MPH and slow almost idling through the neighborhood to get out of the neighborhood - driving. I run 92 octane in it. Should I try to put the old 550's back in and gap them at 0.025"?? Thoughts?

Don’t rely on MGD, who is actually sasquatch77, banned from FRF for spreading lies and trolling. He does not own a Raptor, a ford or an ecoboost. it’s been alleged MGD is not even 18 yet.

Your first order of business should be to take the truck to the dealer and have them sort it out. It may not be palatable, but we had one guy on here who had a misfire issue and threw a bunch of mods at the truck - guess what? The misfire didn’t cure itself! I know, shocking.

First, they need to actually determine if you’re getting a misfire and if you are, they need to trace back from the plug for a defective part or parts. Anything in that circuit could be bad from coil, to PCM. you might have a bad sensor or 2, who knows? Right now, we don’t.

 

[RobertH6657]

Thanks for probably the best advice at this point. I put the SP550's back in. I left the gap on them untouched. I put them back in the same cylinders I removed them from. Calling Ford to schedule service on it now. Last time I spoke to the dealer they said they can put a "black box" recorder on it that collects more data. Maybe that's the next step. Who knows. I'll keep the group posted....just don't hold your breath for any revelations.

 

[k-rub]

When you get the misfire do you see the message through the Ford Pass App? The App will say misfire for a variety of different codes. If you can, get something to read your codes through the OBDII port. That way you can know exactly which code is being triggered.

I've had one actual misfire incident because I removed the turbo sound reducers inside the intake. I put them back in and the issue was gone.

I had a loose connection on one of my O2 sensors and I got the misfire code.

FWIW, I had terrible hesitation issues after running a tune during mid throttle. I pulled my plugs out. They looked ok as far as wear but were gapped to .021-.022 from the factory. I regapped them to .028 and I now everything runs smooth even with the tune.

EDIT:

I just read though the thread. Looks like you have covered all the areas I would. Maybe put the stock plugs back in and change the gap. I found this page with information about that code you are getting.

https://www.autocodes.com/p0330_ford.html

Says the knock sensor may have issues. I wonder how much it costs? If it was cheap and easy to install, I would probably replace it myself.

I wonder if you could go the dealership and request the newest version of the PCM/TCM update. They have to hook it up to their diagnostic machine to see if it needs updating. I'm kind of reaching at this point though.

EDIT:

I would also try to locate the part of the wiring harness that connects to the knock sensor and see if it has some areas that could have been burned by coming in contact with the block or other hot parts.

 

[kpg81]

You should try the 2018 coil packs ..