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My spark plug adventure


New Member
Hey guys. New to the site, didn't see a page to introduce myself so I figured I'd just jump right into it.

I'm driving an '06 speed6 which I bought in... October? of 2012. I love the car, it's my daily driver. I've put about 15,000 miles on it since I got it. A couple months ago I started to notice a little bit of a stutter at WOT. I did some googling and found a guy on another forum who started a discussion about how to fix this exact kind of problem. His advice was to take off the intercooler, take out the coil packs, stretch the little spring that's in there so that you know you're making good contact, and then reinstall it all and kapow, it should work fine. SO. I buy decently expensive new plugs from an auto parts store because I figure as long as I'm in there, may as well replace them. I get my intercooler off, replace the plugs, stretch the springs, reinstall, and drive away. My problem only intensifies. So I go to the Mazda dealer, meet Danny, get turned onto this site, and spend about $100 on plugs. I'm waiting for my engine to get a little less toasty now so I can install the new plugs, and I guess my questions are:

1. Did I just waste 100 bucks?
2. If so, what is my actual problem?
3. Can I put plugs in this thing that don't cost $20 a piece without creating any problems?

Thanks a lot guys. Looking forward to being an active member here.


My guess is that you've got issues with the coil packs themselves, not the plugs. How many total miles on the car?


New Member
The guy who's helping me out with this is a really good friend and mechanic, and he suggested I use dielectric grease when I installed the plugs that are in there now (not the ones from Mazda) and he's saying that might have caused the problem. Thoughts?


SUDO Make me a SAMCH
I had the exact same problem on my 06 speed6 at about 100k, to the point where I got a CEL. I pulled codes and it was a missfire on 1. Replaced the plugs problem persisted. So I replaced the coil on 1 and problem went away for a couple days but then came back. This time on 2. I've seen this happen on other vehicles where one coil after another will fail so I just bought 3 more and replaced them all. I got mine on rock auto for like $40-50 each IIRC.


New Member
Well the new plugs are in now. Doesn't sound like they're gonna help, but we'll see. If not I'll try replacing the coils like you said. Thanks a lot guys.


And unfortunately no- there are no cheap plugs for the DISI. It annoys me to no end.


New Member
Sorry for the super late update. After throwing in $100 worth of plugs I got from the dealership, my stutter decreased significantly but still persisted. Oddly enough, a week later I got an oil change and the problem vanished. However, a few weeks after that (last night), my engine exploded. I couldn't get much out of the guy from Bobby & Steve's, but I'll be starting a new thread, as I officially need a new engine. Sigh.


I'm wondering if your CDFP didn't fail..... pretty common on these cars. See your other thread.


New Member
Hello... Could anyone please tell me the correct colour for 1971/72 750 GT spark plug leads? Also did they have KLG plug caps? Many thanks, Jod


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