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Old 10-08-2021, 05:22 PM   #1
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VW Jetta General Maint.....



My VW Jetta 1.4 turbo 5M is nearing the 40,000 mile spark plug change point.

I am considering going beyond 40k - and using MPG, starting ease and engine
power flow (no missing or other lack of power symptoms).

A pal of mine says exceeding 40,000 on the spark plugs can cause coil failure.

(He even called me "DUMBASS" - - -)

ANY THOUGHTS OR IDEAS HERE?


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Old 10-09-2021, 12:20 AM   #2
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On a modern high pressure injection engine, I'd change them often. I skipped a year on mine because they are very expensive, $100+ for 4, but the service engineer bought one into the shop for me and showed how burnt out it was. I'd done less than 10,000 miles. I appreciate mine has almost double the power, but yours is a similar set up, small displacement, turbo charged, probably has high pressure injectors like mine too.
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Old 10-09-2021, 04:33 AM   #3
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[B]Hi 'flag, Thanks for your input here. I'm now waffling between dealership plug replacement and using my MPG, easy starting and freedom from misfires approach........which has worked well in previous cars./B]

all the best,



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Old 10-09-2021, 06:09 AM   #4
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It depends on the type of plug you have fitted. My Jazz has the option of standard plugs changed every 25K miles and Indium plugs. These only need changed every 75K.
If you follow your routine it might be worthwhile removing, reset the gap and refitting them. It is too large a gap that can cause coil failure and plugs left too long sometimes seize which removing and refitting help prevent.
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Old 10-09-2021, 10:12 AM   #5
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Spark plug life

Thanks Jocko,

The car is completely stock. I really don't know much about the stock plugs

40k seems a little early - based on my Honda Accord experience with Iridium plugs...................


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