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1998 Ford E-Series Van Error CODE PO305 and PO306

Tiny
NEVANS2600
  • MEMBER
  • 1998 FORD E-SERIES VAN
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 224,000 MILES
I'm getting both error codes for misfire on 5 and 6. I believe the misfires happen around 40 mph. The van shudders around that speed. I've had a complete tune up done on the ignition system. What else could be causing the error codes.
Sunday, March 1st, 2009 AT 5:55 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check 5/6 sparkplugs, compression and injector

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
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Sunday, March 1st, 2009 AT 6:02 PM
Tiny
NEVANS2600
  • MEMBER
  • 2 POSTS
Plugs are fine and compression is good. How do I check the injectors? Thanks.
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Sunday, March 1st, 2009 AT 7:07 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the fuel injectors resistances and do a fuel pressure drop on each injector
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Sunday, March 1st, 2009 AT 7:18 PM

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