Question about 1996 Ford Explorer

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My expedition check light engine on code#po306

I changed thhe spark plugs on 12/08
the coils were changed last year. i also changed the egr
why is my truck still stalling?

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You have some sort of bad sensor. The check engine light will only come on for bad sensor or electrical problem. It will not go on if it is vaccum, fuel, or spark related.

Posted on Jan 30, 2009

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You need to see if there are any codes in the OBD system.That's a good staarting point.

Based on your description, and how on '89 6 cylinder Ford I had ran, I would think it was a throttle position sensor. But you need to check for codes, and last resort, find a copy of the Factory Service Manual (not Hanes, not Motors, not Chiltons) at your local library. The FSM's give you all the diagnostic checks that the dealer techs use.

Posted on Jan 30, 2009

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Stop in at autozone and have them read the codes .. it's free then repost the question with those codes



Robert

please take a moment to rate this solution thanks

Posted on Jan 30, 2009

  • Roberta Smith
    Roberta Smith Jan 30, 2009

    I missed that you did the codes... the general consensus is that you need to have a compression test on the motor as one the valves in that cyclinder may be weak or sticking



    Any work done on that motor recently ?

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We need your year,engine, V6, V8, etc, to help

You never change parts to solve any issue
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Check engine light on


Here are some possible causes: PO306 means cylinder #6 only.

Possible Causes onepx.gif Setting Conditions onepx.gif onepx.gif onepx.gif onepx.gif
  • Air leak in the intake manifold, or in the EGR or PCM system
  • Base engine mechanical fault that affects only one cylinder
  • Fuel delivery component fault that affects only one cylinder (i.e., a contaminated, dirty or sticking fuel injector)
  • Ignition system fault (coil or plug) that affects only one cylinder

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