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Intermittent engine misfire after warm start

G

G_S_3_4

PCGB Member
Member
Car: 2010 Boxster S. Problem scenario:
  1. Drive car for 1 hour or so
  2. Park up for 1 hour or so
  3. Start off, engine starts to misfire after 20 yards or so, check engine light comes on; OBD analysis says cylinder 5 (only)
  4. Stop engine; drive off again, no misfire or check engine; so problem appears to be random
  5. Misfire never occurs after cold start
Any ideas?
 
Intermittent problems are always difficult to track, but if the error code relates only to a single cylinder most likely it’ll be sparking plug or coil-pack related.

Jeff
 
Swap coils in cylinder 5 and 6, if the error goes to 6, you will know it is the coil.
Many people change all coils. Not essential. When I had a fail on my 2010 Cayma. S (no 4, 4 years ago), I changed all three on that side (they are not too expensive and the extra work is minimal). I kept the working coils as spare in case another went. All good so far at 93K miles.
 
Thanks all. In the "good old days" of engine management there was a separate cable from the distributor to each spark plug. What's the setup in this case - is there a separate cable to get, or is it a kind-of "octupus" setup where all the leads are a single unit?
 
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