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I have owned my 2008 997 for about three years. This summer, I started commuting more to work and racked up about 2500 miles. I always had a slight smell of catalyst when accelerating up hills which caused me some concern. Last week, I developed a slight miss which quickly got worse followed by a CEL. Durametric told me that as many as four cylinders were misfiring.
I replaced the plugs and coil packs on Saturday. Take a look at these puppies, nasty.....
Needless to say, this was the best $300.00 I ever spent. Car runs better than ever and no more smell (which I assume was a lean condition). I know this has been beaten to death, but this should be a regular maintenance item at quicker intervals. My 2008 has 53k.
For those contemplating a DIY, this is an easy job all in all. #4 is a little tricky but patience will get it. 2.5 hour job without rushing
some duct tape, and those puppies should be good for another 2500 miles.
I like seeing crappy condition equipment. It makes me feel good about spending on the replacement.
Yeah, they go bad, fast. Comparatively to other cars that is.
I had 5 (according to the stealler) bad coils at 46K, barely rolled in to their lot. Got spark plugs done at the same time. runs like a champ after.
Why would it run lean? Is this a factual thing that happens with engine management when a coil goes bad (engine management system sees misfire and adjust fuel/air mixture such that it results in a lean condition)?
Because lean is bad, bad news under regular running.
Nonetheless, with a 2008 model @ 47k miles, I'll be adding this maintenance to my immediate list.
Why would it run lean? Is this a factual thing that happens with engine management when a coil goes bad (engine management system sees misfire and adjust fuel/air mixture such that it results in a lean condition)?
Because lean is bad, bad news under regular running.
Nonetheless, with a 2008 model @ 47k miles, I'll be adding this maintenance to my immediate list.
.
I misspoke. Minor misfiring caused it to run rich, bad misfiring caused the computer to shut down the affected cylinder to avoid lean condition. Sorry about that
for anyone interested, I had new plugs and coils put on my '07 GT3, which then dropped a Bosch plug's electrode into my #3 cylinder a thousand miles from home, with damage to a cylinder and liner and valves/seats on that cylinder, the engine is out at a race ship. The new Bosch plugs and coils had about one thousand miles, and are now that the coils have been replaced, I have a practically new set of six (coils), if anyone is interested in them.
I expect to have them in several weeks, when I fly out to get my car. I can't recall what new ones cost.
Wow, those things look nasty! I had my plugs and coil packs replaced not long ago, at 10 years and almost 60K. The coils had some cracking, and the car was throwing misfire codes, but nothing like how yours look. My aftermarket warranty paid for the coils and labor.
Weird thing is my gas mileage has actually dropped almost 2mpg since then. Not sure it's in any way related. Taking it in for an oil service next week and will ask them to check into it.
Weird thing is my gas mileage has actually dropped almost 2mpg since then. Not sure it's in any way related. Taking it in for an oil service next week and will ask them to check into it.
for anyone interested, I had new plugs and coils put on my '07 GT3, which then dropped a Bosch plug's electrode into my #3 cylinder a thousand miles from home, with damage to a cylinder and liner and valves/seats on that cylinder, the engine is out at a race ship. The new Bosch plugs and coils had about one thousand miles, and are now that the coils have been replaced, I have a practically new set of six (coils), if anyone is interested in them.
I expect to have them in several weeks, when I fly out to get my car. I can't recall what new ones cost.
All the best...
Hello. Are you saying that the plug was defective and the electrode broke off into the cylinder? Could the installer have damaged it? Nightmares are made of this kind of stuff. Unreal.
Lol I actually considered that, except I've had it 6 years since it had 20K on it and it always averaged consistently 16.5-17mpg on the same daily commute that now averages 15. I fill up at the same Chevron station as always, it's the same % ethanol as it has been, same tires and pressures as before, same use of A/C. Really weird. If something is off, the shop's computer diagnostics should find it. Hopefully.
I had my spark plugs changed recently after 6 years and 38k miles and my coils looked brand new, except a little dust. It must be the salt on the road in northern states.
09-07-2015, 08:44 PM
Engine misfire- Now here is some bad coilpacks!
