MISFIRE AT 45 MPH

  • Tiny
  • lpgred
  • 1995 Toyota 4Runner
  • 225,000 miles

1995 Toyota 4runner v6 3.0L just had tune up-plugs, wire, dist. Cap, rotor. Injectors cleaned/checked. Idles good in Park. In gear while accelerating it misfires/jerks at 45-50 mph but only in that speed range. Sometimes idles rough at stop. What should I check next and how can I get a 95 scanned for codes?

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Thursday, August 16th, 2012 AT 11:55 PM

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  • Tiny
  • saturntech9
  • Expert
  • 29,881 posts

It sounds like a egr valve issue that would explain only happening at that speed. Let me look up the info on reading codes without a scan tool on that.

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Friday, August 17th, 2012 AT 12:42 AM
  • Tiny
  • saturntech9
  • Expert
  • 29,881 posts

I posted how to read the trouble codes without a scan tool. After reading the codes try unhooking the egr valve vacuum hose that opens it. Tak it for a drive and see if the problem changes?

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Friday, August 17th, 2012 AT 4:13 PM
  • Tiny
  • lpgred
  • Member

Is that the small hose going from the egr regulator to the valve? It didn't run better and actually sounded louder.

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Friday, August 17th, 2012 AT 8:13 PM
  • Tiny
  • saturntech9
  • Expert
  • 29,881 posts

The small rubber hose on the top of the egr valve.

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Friday, August 17th, 2012 AT 8:22 PM

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