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Loose Spark Plugs? Not Mine.

  #1  
Old 06-06-2019, 08:41 PM
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Loose Spark Plugs? Not Mine.

Just thought I'd add my data points to the collective group think.

Yesterday, I changed the spark plugs on my 2013 Fit. Approx. milage: 57,720. This was the first time the plugs had been changed. Point of interest: The factory had put in the NGK plugs.

None of my plugs were loose. In fact, they were in there mighty tight, and I could barely break them free with my girlie but really very attractive hands. (On one cylinder, I had to use an extended handle on my rachet wrench.) The plugs looked great and clearly did not need changing, but, given how hard it was to remove them, I have the feeling that they were on their way to being completely seized.

With regard to the loose plugs story: Do we know how many of the loose plugs were service replacements and how many were original from the factory?
 
  #2  
Old 06-06-2019, 10:55 PM
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Originally Posted by Mister Coffee View Post
With regard to the loose plugs story: Do we know how many of the loose plugs were service replacements and how many were original from the factory?
I would have liked to know this with mine. Bought it with about 50k on it and never checked or changed plugs up until it was totaled at 93k miles. Was I lucky? Were they replaced or checked before I bought it. Came from a dealer (not Honda) so maybe they pulled the plugs to check them out.
 
  #3  
Old 06-07-2019, 06:15 AM
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I think there were claims of a few loose factory spark plug issues, but honestly, I think the issue is AFTER initial replacement.

As I've mentioned before, my theory is that the threads on the spark plug are exposed to build up inside the cylinder which then damages the thread on the engine block as the spark plug is removed.

I mean, my factory spark plugs were very tight on my engine when I removed them at 134k miles/8 years, but the replacement spark plugs came loose shortly after, got re-tightened and ultimately failed less than 4 6 months later (came loose again and broke the ground electrode). The next replacement lasted only a month before coming loose and then spending money on yet ANOTHER replacement after that, only for that one to come loose within a few weeks also. I finally gave up and re-threaded the cylinder and it hasn't come loose since.

Edit: I just went through a few of my previous posts where I mentioned my issues and saw that the spark plug was replaced by the dealer around end of Sept. The initial symptom of sputtering out occurred a few times for only one day at the end of August. I then forgot about it until end of Sept, where I ended taking it to a dealership.
 

Last edited by Goobers; 06-07-2019 at 05:02 PM.
  #4  
Old 06-07-2019, 06:25 AM
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I bought my '11 Sport AT new (11 miles on it) and the Check Engine Light came on at 37,642 miles but I was getting the odor of gasoline on cold morning start-ups for a week or so before that. #2 & #3 were the loose ones. I replaced with new plugs thinking that a new crush washer would keep them tight if I used the spec torque but it didn't and #2 & #3 worked loose again. That's when I used some blue threadlocker (Permatex paste) and good so far at ~77,000 miles on the unit now (~40,000 miles later).
 
  #5  
Old 06-07-2019, 09:30 AM
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Last year a Bernadi Honda dealer tech told me they looked at spark plug replacement around 100k miles. Given how difficult and expensive it is to change the plugs on this economy car, there are probably not many people changing plugs before 100k unless they have issues or are trying to address the loose spark plug issue.

We see several recent posts on this forum documenting that Honda recently increased torque spec on spark plugs (discussions with Honda dealer techs & photos before/after of Honda tech manual). Why would Honda boost that spec?

There are a few recent threads here of people changing spark plugs to address the loose plug issue. On a 65k mile 2011 Fit Sport we seemed to have a slightly loose plug on #2 or #3 (we didn't measure torque of original spark plugs but used a lot of torque wrenches in school). There are several posts on Fits with blown out spark plugs. I didn't count or analyse the number of people with issues but sensed an obvious problem.

The repair of blown out spark plugs is expensive & difficult for the DIYer (we had spark plug blown out of a GM car last year). So changing Fit plugs and using new torque spec was cheap insurance from our point of view.

Note the max torque specs for a typical alu head are not so much higher than the new Honda spark plug torque spec, so use care. If you have never used a torque wrench, practice at that range a bit beforehand.
 
  #6  
Old 06-07-2019, 12:32 PM
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Originally Posted by Goobers View Post
As I've mentioned before, my theory is that the threads on the spark plug are exposed to build up inside the cylinder which then damages the thread on the engine block as the spark plug is removed.
The threads on my spark plugs were clean. Shouldn't I see some evidence of this "build up" you speak of?
 
  #7  
Old 06-07-2019, 04:14 PM
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Originally Posted by Mister Coffee View Post
The threads on my spark plugs were clean. Shouldn't I see some evidence of this "build up" you speak of?
What's your definition of "clean"? Why not post a picture?

Are these "clean?"





First two are the same spark plug from my initial change in March 2018. The third is from a short lived replacement in December (the third one I mentioned earlier).

Regardless of whether they're considered clean, it's clear that part of the threads is exposed to the cylinder's combustion.
 
  #8  
Old 06-07-2019, 10:39 PM
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A very close friend of mine had #3 eject at 109,000 miles. They were the original factory, never changed plugs.

That resulted in calling me so I could pull the cylinder head off and take it to a machine shop to be repaired correctly.

Do whatever you want with your Fit's. I don't buy used cars so I don't care. As for our Fit and my Mom's Fit, I'll keep changing the plugs at 50-60k intervals. My friend didn't listen to me and that cost him $$$ and me a weekend.
 
  #9  
Old 06-10-2019, 04:30 PM
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Save it for penthouse forum, bub.
 
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