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Mis fire

Tiny
MDHAYNES
  • MEMBER
  • 2001 TOYOTA HIGHLANDER
  • 175,000 MILES
I have a 2001 highlander that coded miss fire's on 2, 4, and 6 with a coil code as bad. I changed all the coils and plugs and still getting multipul miss fire and cylinder 2 mis fire. What else could the problem be?
Wednesday, May 15th, 2013 AT 6:07 AM

7 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Codes don't tell you what to change or what is bad. They merely record a specific situation that the technician has to diagnose.

What are the exact code numbers being set now and what are the symptoms?
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Wednesday, May 15th, 2013 AT 7:02 AM
Tiny
MDHAYNES
  • MEMBER
  • 4 POSTS
It codes back with p0300,302 midfire, 304 misfire, 306 mismire, 1300,1305,1310,1315,1320,1325, and 1354. Thanks
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-1
Thursday, May 16th, 2013 AT 7:05 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Are those codes current? Did you clear everything after the last repair?
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Thursday, May 16th, 2013 AT 7:34 AM
Tiny
MDHAYNES
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  • 4 POSTS
Yes several times
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Thursday, May 16th, 2013 AT 9:05 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
You must have a wiring or PCM problem. I'd start looking for a bad connector somewhere in the harness that feeds those coils. You're also setting a VVT code.
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Thursday, May 16th, 2013 AT 9:32 AM
Tiny
MDHAYNES
  • MEMBER
  • 4 POSTS
Decided to get a diagnostic check to see if it might be the VVT. All wiring and connections look good. Thanks for your help
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Thursday, May 16th, 2013 AT 10:55 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Somebody is going to need a lab scope to track down where that is happening.
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Thursday, May 16th, 2013 AT 11:12 AM

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