I will be changing out my spark plugs soon and Im looking for advice to see if its necessary to install new coils as well. I have not had any misfires that I know of. If its recommended, what brand should I get?
Also I'm considering borescoping the cylinders at the same time. I have noticed that my tailpipe gets pretty suetty and Im hoping/praying there is no bore scoring.
Any advice would be helpful.
Thanks
Hi - what year/model do you own? And miles on it?
I think the coils are good to change when you change plugs every 80k miles or so. They age due to heat, and the longer they're in there the more heat they've been subjected to. I don't think it's an age thing. Older low mileage cars shouldn't need coils. A newer high mileage car might.
As far as scoping the cylinders, I assume you mean through the plug holes. If it makes you feel better then absolutely do it, but I don't think you'll see much. When bore-scoring takes place it's generally in the area of the bore at the very bottom of the piston stroke, and the piston covers it up. The real engine guys try to get a look from the bottom (involving some level of engine disassembly) since that's where it will show up first.
And the reason I asked about engine/year is some years are less prone to bore scoring and more prone to AOS failure, which will cause some sooting of the tailpipe. A bit of soot is normal anyway. The real clue is clouds of blue smoke, that's something to be a bit concerned about.
Its a 2006 S with 95,000 miles on it so its probably due. Im the 3rd owner and the small bit of maintenance history I have is noted in the
Porsche
manual booklet in the glove box. It shows it got new plugs at 60,000.
I don't have any blue smoke or ticking noise so I guess that's good. I have heard some guys going up thru the oil pan which would involve pulling the bottom sump lid and going up from there. I'll try to avoid that if I have too.
Coils are not that hard to change. If I had no misfire codes I would not spend the $$$ on coils.
No misfires, then coils are working just fine.
But...... If I knew that I was keeping the car, with today's supply chain mess, I might be shopping to see if they are obtainable, and if they are gouging currently.
At some point one of them will be the first to let you know that they are reaching end of life.
Still, no immediacy or angst necessary
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95.000? Change them. IMO there is no sense doing the labor to get to the plugs and leaving the coils alone unless you have exceptionally low mileage when the plug change occurs. Coils are easy to replace and the labor you save on the entire job makes them essentially free when compared to dealer cost.
Given the mileage and your not sure if they been replaced, I’d consider doing it.. hey if it doesn’t make a difference at least you’ll have a spare working set.. although generally im a “if it’s not broke don’t fix it” kinda guy…
Yep I purchased new plugs and coils. Thanks for all the advice
When you remove the old ones - look carefully on the shaft of the coils for lengthwise cracks. I'd be interested in knowing if you see any... I've had coils with those cracks in my Cayenne TT which seemed to work OK, but I'd guess if they got wet they might start arcing to ground via the cracks. I replaced all of those coils at 80,000 miles.
