It wasnt the anti sieze...its the fact that i was overtightening them...i took them out and sure as **** they were cracked again. So i through spares in there and now it runs better than new (i'll get all the same plugs tomorrow). 11 ft lbs though, seriously ford? why is this?
Anti-seize lubricates and allows you to over tighten. The same is true of lubricating lug nuts.
2015 Ford F-350 XLT 6.7L PSD with 5th Wheel Prep Package
Cougar High Country 299RKS with Reese Sidewinder pin box
Didn't know I had the misfire/shudder issue till I put a 91MPT tune in.
Even with a 87 Tow tune in the problem is there but stock never ever threw a code or misfired.
Pulled the plugs this morning a all were gapped around .40 but plugs themselves looked amazing good with 30K on them.
Re gapped to .30-.32
Initial start up the truck had a surge at idle,probably 100rpm bounce.
Went and did multiple launches and wide open throttle runs and misfire is gone.
Idle has steadied out too.
See where it goes from here...
what kind of plugs are you using? NGK or Motorcraft? what is the part number? I have the MPT tune and needs to learn what to do so i don't get misfire.
Remove the anti-seize, clean it real good with some brake cleaner and let them dry. I know it goes against what you want to do, put them in clean. At least until this can be ruled out.
The plugs only torque to 133 inch pounds, thats like 11 ft pounds. Seriously that is next to nothing. I have done these plugs 3 times now, haven't messed up a single plug yet. I can run the plugs down just to they stop and they will click 133 in lbs without turning. Seriously not much.
On my 2000 mustang the 4.6 v8 heads are notorious for stripping out.
I've always used a 1/4 ratchet instead of 3/8 or god forbid someone tries a 1/2"... with adapter to try to prevent over torquing.
I am going to be checking mine tomorrow morning I am experiencing spark blow out at like 5500 rpms in wot 1st gear.
I had a problem with one of the boots coming off the end of the coil. I was working on a cold engine. Do you think it would be better for the engine to be warm? I have 2 more plugs to gap but am a little worried about pulling off another boot.
Replaced my plugs today, 3 were at 0.40 the other 3 somewhere between 0.35-0.40, what was really weird was that the ceramic on two of the plugs cracked or were already cracked when I pulled them out. I've replaced plugs on numerous vehicles and I've never seen that before .
Replaced them with Motocraft SP534... all gapped at 0.30... so far so good.
Could be a plug quality issue, rather than a heat range issue. I've swapped back and forth a few times as well. I get similar mileage and performance. I'm thinking about testing a set of stock heat range better quality plugs next.
Watt, both gapped the same? Gap can change idle quality ect....
Hey, curious --- what is your mpg? My sucks at 17 average on highway I travelled 20 times. It used to be 19.8 mpg and best 20.1. I'm not seeing any fuel milage improvement with recent MPT tune 87 economy with chilled.
Maybe I should ask Mike from MPT...but wanted you to answer what kinds of mileage your experiencing. It seems the cold weather is almost over, been getting low 15s to 17.8 tops. Need a real solution here!