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    infinite's Avatar
    infinite Posts: 9, Reputation: 1
    New Member
    		  
    #1

    Aug 14, 2008, 11:22 AM
    Rough Idle/Miss when engine light comes on; light comes on and goes out
    Hi
    I have a 1998 Ford F150 Pickup with the V-6 engine. I am getting three codes P0174 (system too lean on bank 2), P0302 (cylinder 2 misfire), P0303 (cylinder 3 misfire). My truck has a very rough idle, but at times the engine light will go off and the truck will idle perfectly. When the light comes back on it idles rough again.

    I have changed the coil pack, spark plugs, spark plug wires, fuel filter but I can't get the light to stay off and get rid of the miss in my truck.

    I appreciate any help anyone can give me in advance.
    Charles
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Aug 14, 2008, 01:34 PM
    Did you use the exact Motorcraft spark plugs that came in the truck or some cross-reference plugs? Were spark plugs gapped to specs?

    Try cleaning MAF Sensor with specialized cleaner--follow directions on can exactly.
    infinite's Avatar
    infinite Posts: 9, Reputation: 1
    New Member
    		  
    #3

    Aug 14, 2008, 03:43 PM
    Yes I did clean the MAF Sensor with contact spray and changes the air filter. I also gapped the plugs to the manufacturer specifications.

    I appreciate the answer though.

    Thank You
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #4

    Aug 14, 2008, 05:56 PM
    If you used contact spray the MAF Sensor was likely destroyed--it requires special MAF Sensor spray.
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