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TJrob2000

Did I needlessly replace coils/plugs?

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2006 CS Ti.  Approx 130,000 miles

 

Recently the CEL came on.  My OBDII reader showed misfire for all cylinders (this was on a cold start, so not warmed up yet).  Previously it had shown misfire in the ready list so I figured this has been intermittent for a while although the car has been driving fine.  No issues with power, hesitation, fuel mileage, etc.  So, I went ahead and ordered the coils and plugs and changed them today.  Every coil looks perfect.  No signs of cracking anywhere.  The plugs also looked absolutely fine.  What I'm figuring (hoping?) at this point is the coils themselves are failing.  See the link for pics.  The service history I have shows these were changed at 102,000 miles with the 002 part.  The coils I installed are 012.  Not sure this is going to make any difference but time will tell.

 

See coils and plugs here.

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We have become so used to plugs with a long life it's easy to forget that these things take a real pounding.  I can still remember when it was routine to change plugs at 10K miles and do ignition points at 3k miles.  Really, it's never wasted money changing plugs and as the ignition coils are in such hostile location in terms of exhaust heat and surface water I am really surprised they last so long.  

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Sorry for not replying sooner.  The car is running as it always have, which is to say fine.  I'm keeping the old coils since they all look fine.  Will toss the plugs.

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