Question about 1999 Mitsubishi Eclipse

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Trying to repair 99 eclipse 2.0 DOHC , came in shop with header, O2 sensors eliminated. seems to run ok, has a system rich code, will stall sometimes at idle and very hard to start back.

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  • kcprice60 Jul 05, 2010

    Does not have mass air flow, O2 sensors non existant, fuel pressure 52psi at idle, ALDATA info says it should be 38psi

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  • Mitsubishi Master
  • 6,826 Answers

Drill,and make a hole in the manifold,and weld 18 mm nut on the hole and install the o2 back in the exhaust system.Also,check the fuel pressure regulator,it could be at fault.

Posted on Jul 05, 2010

  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jul 05, 2010

    Then the fuel pressure regulator is not working.

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  • Mitsubishi Master
  • 17,970 Answers

Check the next causes to this problem:

  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
  • There could be a vacuum leak.
  • There could be a fuel pressure or delivery problem


Possible solutions include:
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Cleanthe MAF sensor. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
  • Inspect fuel lines for cracks, leaks, or pinches
  • Check the fuel pressure at the fuel rail
  • Check the fuel injectors, they may be dirty. Use fuel injector cleaner or get them professionally cleaned/replaced.
  • Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)

Tell us news.

Posted on Jul 05, 2010

  • kcprice60 Jul 05, 2010

    No mass air flow, cant find any vacuum leak, O2 sensors non existant, fuel pressure too high, 52psi at idle, info tells me should be 38psi

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CODE ???? If you would like help need to know what code ? P0172 ?
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o2 sensory ???? ha ha ha lol . it's O2 sensor Suggest you take it to a qualified repair shop . Because you have no clue .

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