Is low level misfire ok on a v12?

[@user-qq2mo1ek2r]

Great advice Mike as usual. It does make you wonder whether the franchised route is ever better than a specialist such as yourselves

[@HarryESwan]

Great advice like always Mike, too bad we don't have a shop like your here in FL USA.

[@omarr6021]

Having own several AM v12 I am very mush aware of the miss fire problem,,,,what surprise me the most is the negligence attitude from the factory towards the problem . I would expect them to come out with a permanent solution by now

[@markcarter9476]

Fascinating analysis of dealer attitudes to us, their customers .......

[@Phantom-ni7jj]

Before storing my car for the winter period I read out my DB9 (2007) for misfires with an OBD2 tool and the correct software. I got about a dozen misfires in 15 minutes at worst and only one or two at best.

[@alanphillips4851]

There is also a market of diabolical knock off Chinese coil packs. The replacement with these could occur if you don't use a trusted repair facility that knows the cars. OEM is only option. Its not really a job you want to do twice. Yes I admit, I learned that one the hard way in early days of ownership. The car had a misfire when I tested it pre-purchase. Not a bad one but enough I could feel it wasn't perfect. The Dealer (non Aston) replaced them as a condition of sale. I had to replace them all again within 1000 miles. I did the job myself this next time. They has used $30 knock offs versus the $150 real deal. As a result I actually tested a selection of the coils and some of the Chinese knock offs could barely manage 10KV.

[@heinrichgerhardt6119]

What is it with the short life of AM V12 ignition coils? I bought a 2011 V12 Vantage last year with 30k miles. Within 1000 miles of purchase, the low-level misfire got to the point of turning on the Check Engine light. I sourced new coils from an Aston dealer in the UK and was dismayed to see that the new coils were made in CN (China). I wonder had I purchased $12 coils directly from China if that would have been the same part? I will never know. And replacing the coils and plugs did indeed fix the misfire issue, and also provided an opportunity to replace the PCV valves.

[@cruiseoveride]

Wow. Do you have a picture of the coil? They used to be made in Germany

[@heinrichgerhardt6119]

@@cruiseoveride I do, but you can't attach pics or even a web address in the comments or youtube removes the post.

[@cruiseoveride]

@@heinrichgerhardt6119 Please post it on one of the forums (6speed or pistonheads). I think more people should be aware of this.

[@mikeyap4159]

Maybe you can share with us your photo on your KZbin

[@alanphillips4851]

@@cruiseoveride The AM coils still made in Germany in 2020. I put a comment further up about my own experience with Chinese knock offs that an Indy had used in my car.

[@The-Sea-Dragon-1977]

In the market for a DB9 and becoming very tempted to buy a cheap 54 plate, de-cat the primaries and self insure. Probably more cost effective than getting a £55k car from a dealer with a 'warranty'.

[@christianlie1004]

I notice that the 10 cycles average missfire count for the car is way below the last driving cycle missfire count average. Does this indicate that missfire counts suddenly can rise dramatically and that monitoring the counts should be done as frequent as possible? Or is this a result occuring from the fact that the last cycle is an idling cycle only whereas the last 10 average probably are from longer runs?

[@MARQUES-re6gn]

💯, 👌