Question about 1999 Lincoln Navigator

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My Navigator is running lean in bank 1 and 2 how repair myself?

Lincoln Navigator 1999 is running lean in bank one and two. How do I solve problem?

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  • awhite1906 Jun 28, 2009

    Thank you. I will check that out. I will reply once checked.

  • Anonymous Mar 16, 2014

    misfire on number 7 cylinder also bank 2 sensor 1

  • Anonymous Mar 24, 2014

    code

  • Anonymous Mar 28, 2014

    shaking engine poor idle

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Why is my navigator running lean thats why my check engine light is on

Posted on Sep 29, 2009

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On your Navigator the most likely failure that will cause a lean condition on both banks is the PCV tubing. Start at the PCV valve in the passenger side valve cover and follow it to its connection to the intake manifold, and closely inspect the rubber elbows in the tubing for vacuum leaks.

Posted on Jun 28, 2009

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1 Answer

Running lean bank 1 and 2


It depends on the vehicle. Best bet is to get the codes erased first then go on as you would driving. If everything is ok they will not reset.

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1 Answer

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I think I would try the easiest thing to fix and then see how much straightened out. The fuel tank vacuum will probably be a gas cap not on tight or defective or a gas vapor line has a hole in it. You may need a smoker to find that leak if the gascap is okay,

Bank 1 should have cylinders 1,2,3,4. Since 3 cylinders that are in the same bank are misfiring it must be lack of fuel or bad spark. The tester said that bank was lean. If the plugs were not firing it would be rich with unburned fuel. The tester also indicated the other fuel tank vacuum bleed problem.

You might try the power connector for the Bank 1 injectors or check the injector wiring for #2,3,and 4 to see if they are getting power.

Remember to clear the diagnostic meter to see if the trouble codes return. Would be interested in the outcome.

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1 Answer

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98 Lincoln Navigator Check Eng light on


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