2001 Toyota Tacoma Q&A
2001 Toyota Tacoma Question: P0304 code - what is the most common problem?
To start with , remove (keep in cyl. order!) the coils and look for sighns of arcing - heat spots-bluish/copper and pull plugs (again , keep in order) if all coils look the same to you , put the spark plugs back in , but switch cyl. #1 with cyl. #4. Put coils back in exactly where they came from originally. Start up and run it until it 'codes again and see if the misfire is still on #4 , or if it switched to #1. IF it switched to #1 , then the plug is a likely culprit(misfire followed plug). IF misfire is still #4 , then now switch #1 & #4 coils and see if the misfire follows the coil. IF it did , then replace the coil. Post results. - ziptie12