OBD code 0304 (misfire)

2001 VOLKSWAGEN BEETLE
204,000 MILES
Avatar
ATOMICDR
  • MEMBER
  • 49 POSTS
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?
Dec 31, 2011 at 9:49 PM
Advertisement
Avatar
FIXITMR
  • ✓ASE Certified Mechanic
  • 9,990 POSTS
  • ASE Certified Mechanic
maybe ignition coil.
Dec 31, 2011 at 10:40 PM
Avatar
FIXITMR
  • ✓ASE Certified Mechanic
  • 9,990 POSTS
  • ASE Certified Mechanic
watch spark on that cylinder on cold start and watch again when has miss. use spare plug and maybe widen gap.
Dec 31, 2011 at 10:41 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.