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Why is it running lean.

Discussion in '4 Cylinder' started by Rebelgone, Aug 2, 2010.

  1. Aug 2, 2010 at 3:57 PM
    #1
    Rebelgone

    Rebelgone [OP] Member

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    I have a 02 2.7. All 4 plugs are white. Which is telling me the truck is running lean. Plus it is pinging. I can not figure out why it is running lean. It has new plugs and fuel filter. The computer is not putting out any codes. I was thinking it was the mass air flow sensor. I do not want to just replace if that is not it(that sucker cost $150). Any ideas or something to look at. Thans for the help.
     
  2. Aug 2, 2010 at 8:11 PM
    #2
    skytower

    skytower Well-Known Member

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    Hitch and wiring, aux back-up light, rear strobe lights, radio and underseat sub.
    Clean the MAF and throttle body, then reset the ECU via battery disconnect. Also check for cracked vaccum lines with carb cleaner(RMPs will rise if leaking.) ONLY use throttle body cleaner on MAF and throttle body. Carb cleaner will F-up them. Vac lines are after them and will not be affected.
     
  3. Aug 3, 2010 at 2:54 PM
    #3
    larryde09

    larryde09 Well-Known Member

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    x2....did you replace the plug wires with the plugs? Is the air filter new? Maybe a professional fuel system cleaning would help (i.e. could be a clogged injector, valve, etc). Keep up with them by using gumout every oil change.
     
  4. Aug 4, 2010 at 10:58 AM
    #4
    Rebelgone

    Rebelgone [OP] Member

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    I did not see any plug wires. Unless you are talking about the coil that sits on top of the plugs. Them sucker are a $100 each. I was not going to change them if I did not have to.
     
  5. Aug 4, 2010 at 11:04 AM
    #5
    skytower

    skytower Well-Known Member

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    Only replace the coils when bad. Replace the boots when you replace the plugs.
     
  6. Aug 4, 2010 at 2:24 PM
    #6
    larryde09

    larryde09 Well-Known Member

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    ok, wasn't sure if the 02's used a coil on plug.
     
  7. Aug 5, 2010 at 7:21 AM
    #7
    andy2003

    andy2003 Well-Known Member

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    Just a thought the fuel pump could be weak or might have A piece a dirt or grit from the fuel. What grade of fuel do you run. I had a 98 that would act crazy on anything less than 93. Did you try some good fuel cleaner yet?
     
  8. Aug 6, 2010 at 7:38 PM
    #8
    Lichen

    Lichen Well-Known Member

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    It should run fine with 89 octane. Check your O2 sensors, plugs, wire, and maybe run a can of Seafoam through it.
     
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