Ok so besides intercooler condensation causing misfires this is the #1 reason for misfires on this engine. Any misfires on this engine has great potential to damage the catalyst and should not be taken lightly. As many know by now boosted engines are hard on the plugs be it iridium platinum whatever and you may find the need for new plugs by 50k miles. More so now as many are coming in with carbon tracking as this one had. In this video I walk you through the procedure to change out plugs on these engines with the revised plugs, gap specs and TSB that have all come out recently. I hope this helps.

 

Great video! Just as a word of warning to people trying this at home, my 2012 boots were ALL pain in the butt to get out! Took several minutes per boot, very frustrating and needed patience. I used dielectric grease with a Q-tip to make sure the inside of the boots were well coated for reassembly and so next time it (hopefully) won't be so hard to remove...

 

^^ Same here the coils took longer to remove then the plugs on my 13

 

How can you tell there is a misfire? Will the dash light come on or can you feel it. Running mine is fine but at idle its a little rough.

Thanks

 

You will feel a rough idle and or jerking while accelerating. It takes quite a few misfires for the light to actually set.

 

Thanks for the awesome video. I'm changing my plugs this weekend. No issues, just maintenance

 

I know you mentioned the moisture issue causing misfire. Do you know if there is a new TSB to remove the plastic shield over the intercooler. I had a 2012 with this issue, and I still have the plastic shield installed. Wondering if that can be removed with an computer update.

 

The lower stick on shield and removal of the top front shield plus pcm update is the latest fix for the water condensation issue.

 

As always, THANKS maku! A stupid question: why not use a shop vac to vacuum the holes instead of blowing them out?

I told y'all it was a stupid question.

 

Replaced my plugs with carefully gapped oem replacements at 50k miles. 70k miles later and haven't had a misfire since.

 

Have you ever had a boot separate? I'm changing the plugs in my 2017 Ecoboost 3.5. The coil packs/boots will swivel/twist easily but do NOT want to come out and the middle-left side plug boot separated at that joint 2/3s the way down. I got the coil pack back on no problem and reconnected and tested and it runs fine, but I know it's going to separate again when I resume the swap. Mileage is 98k+ so I'm not over, but I just finished the plugs on my 2013 5.0 and had no problems with the coil packs/boots coming out. Have you ever encountered and if so, a resolution? Can you spray a tiny amount of lubricant in the plug well to help get the boot off? Then dry it after new plug is in? I've never had this problem before. Thanks in advance.