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OBD code 0304 (misfire)

Tiny
ATOMICDR
  • MEMBER
  • 2001 VOLKSWAGEN BEETLE
  • 204,000 MILES
The misfire is in hole 4 (if that's the one closest to the tranny). I did have a code 0420 (catalyst.) But it never returned after clearing the codes the first time.(Old code?). I pulled the #4 plug and inspected. It appears fine. Looked in the piston hole. Looks normal. After sitting all night it started right up and ran on all cylinders. Shortly thereafter.
less than 10 minutes running time it started again with the misfire. Running on only 3 cylinders. I'm thinking this may be a heat-related issue with some component of the ecm or other electrical issue. Where now?
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Saturday, December 31st, 2011 AT 9:49 PM

2 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Maybe ignition coil.
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Saturday, December 31st, 2011 AT 10:40 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Watch spark on that cylinder on cold start and watch again when has miss. Use spare plug and maybe widen gap.
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Saturday, December 31st, 2011 AT 10:41 PM

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