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Replaced Old Spark Plugs at 200K miles

Spark plugs

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11 replies to this topic

#1 ONLINE   ptjones

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Posted 19 June 2018 - 02:51 PM

Attached File  sparkplugs.JPG   93.37KB   0 downloads  Not in bad condition, gap was still .05", but when ICE was hot and accelerating up hill it would run rough sometimes after I used injector cleaner. Seems to be working fine with no noticeable problems. I went from SP531 to SP530 plugs.

 

Paul 


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#2 OFFLINE   Bill-N

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Posted 19 June 2018 - 03:04 PM

I went from SP531 to SP530 plugs. 

Why?



#3 ONLINE   ptjones

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Posted 19 June 2018 - 03:36 PM

Half way through the 2013 model FORD changed from SP531 to SP530 which is a little hotter plug.  Can't find any info on why.

 

Paul



#4 OFFLINE   cmax-nynj

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Posted 19 June 2018 - 09:12 PM

Would you share the outcome and process? Thanks



#5 ONLINE   ptjones

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Posted 20 June 2018 - 01:11 PM

It's running fine so far. Haven't got into a high temp situation to really tell.  Here is a video to change the air filter so you can take the air filter plastic box out of the way( good time to replace your air filter) to get to the spark plugs.  and here is one for changing the spark plugs, it's on a focus pretty much the same.https://www.youtube....h?v=XDiEBYCSu-gI didn't take the wires off the coils, didn't need too. Just take it easy poping off the coils from the spark plugs.  I did blow some high pressure air around the caps to get any dirt away, you want to keep things clean and not dropping anything in the spark plug hole.  It is a little scary unscrewing the plugs, but every thing worked out fine. Put some anti seize lubricate on the spark plug threads so it will be easier the next time you need to remove them. :)

 

Paul


Edited by ptjones, 20 June 2018 - 01:12 PM.


#6 OFFLINE   SnowStorm

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Posted 20 June 2018 - 10:16 PM

I've read warnings against using anti seize.  I wonder what the C-Max shop manual says.



#7 OFFLINE   Plus 3 Golfer

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Posted 20 June 2018 - 10:41 PM

Here's why antiseize is a no-no on spark plugs and lug nuts.  Antiseize is a lubricant and can result in applying too much pressure when tightening to required torque level and thus stretch threads / bolts.



#8 ONLINE   ptjones

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Posted 21 June 2018 - 07:30 AM

They do warn you to not over tighten and I still think it is a good idea. When I unscrewed the plugs the Aluminum was grabbing the threads, felt like it was stripping out the Cylinder head threads. Very scary to me. I tightened them by hand using ratchet wrench. 

 

Paul


Edited by ptjones, 22 June 2018 - 07:40 AM.


#9 OFFLINE   Plus 3 Golfer

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Posted 21 June 2018 - 10:08 AM

I learned my lesson in the later '70s when I used anti seize on my 1975 Corvette wheel studs. When my original tires wore out, I purchased new wheels / tires and used anti seize when I mounted them.  Months later I had a stud break off.  Dealer ordered replacements and said you still have 4 on and OK to drive to work ( a few miles at 25 - 35 mph) until replacement.  Several days later, light changed and I braked hard.  Wheel broke away and stayed in fender well.  Dealer said must be bad batch of studs and ordered complete set.

 

It wasn't until years later that I learned the issue with using anti seize and highly suspect the anti seize plus my slightly over torqued lugnuts, caused my studs to eventually break.  I slightly overtorqued thinking it was better than under-torqued since I occasionaly "tested" the tires at "high speed"  :)  on I-79.



#10 OFFLINE   fbov

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Posted 25 June 2018 - 12:02 AM

I've used anti-seize on wheel studs for decades. Of course, I do most wheel changes manually, and my mechanic uses torque limiters on his impact wrenches. Without limiters, I can see how an impact wrench could get you into trouble. 

Frank


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#11 OFFLINE   pianewman

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Posted 25 June 2018 - 08:31 AM

ptjones: How many miles were on the car when you changed the plugs? 

I understand your comment on the plugs' reluctance to be removed, as I've experienced this before, and the feeling the cylinder head is getting stripped. I'm thinking of replacing plugs earlier than recommended, as I have a fear of the plugs seizing in the cylinder head when following the recommended mileage interval.



#12 ONLINE   ptjones

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Posted 25 June 2018 - 09:29 AM

ptjones: How many miles were on the car when you changed the plugs? 

I understand your comment on the plugs' reluctance to be removed, as I've experienced this before, and the feeling the cylinder head is getting stripped. I'm thinking of replacing plugs earlier than recommended, as I have a fear of the plugs seizing in the cylinder head when following the recommended mileage interval.

I just did it with 200k miles on ODO and I wouldn't replace plugs unless you thought there was a problem like ICE not running smoothly.  My plugs actually looked pretty good and the gap was still .050".  The ICE is running smooth though, but I haven't had high WT and uphill accelerating to see if the problem shows up for sure. :headscratch:

 

Paul 








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