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'98 Mountaineer 5.0 AWD - P0340 on startup

Discussion in 'Stock 1995 - 2001 Explorers' started by BobT55, November 14, 2013.

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  1. BobT55

    BobT55 New Member

    October 26, 2004
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    City, State:
    Macungie, PA
    Year, Model & Trim Level:
    '98 Mountaineer 5.0
    Yesterday my CE light came on. Code reader said P0340 and 1309. I cleared the codes, restarted the engine and the CE came on again but only the P0340. With the engine running I clear the codes the CE light stays off until I shut it down and restart at which time the CE/P0340 returns.

    I'm going to try to isolate the alternator and see if the CE/P0340 returns , as other threads suggest, that may be my issue but in the meantime I'm hoping someone knows if:

    - the Cam Position Sensor is only checked on start-up or continuously?
    - if the "only on start-up" indicates a different issue altogether.

    Thanks in advance!
    - BobT55
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  3. Turdle

    Turdle Habla tortuga Staff Member Moderator Elite Explorer

    June 16, 2003
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    City, State:
    Humboldt, KS
    Year, Model & Trim Level:
    2000 Mounty
    Reaching out there, I have heard of alternator noise corrupting the CPS signal.

    The sensor cap screws should be 5.5 mm. stick a socket on a 1/4" drive swivel and you should be able to get the cap off easily. You don;t even need to unplug it to flip it over and have a look see inside-

    I hope the center flag has not broken, and all the sensor needs is cleaning.

    Does the engine make any squeaky noises that sound like the belt slipping?

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