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Rough idle

Discussion in '2nd Gen - 2003 - 2006' started by Harry, Nov 21, 2020 at 1:47 PM.

  1. Harry

    Harry Active Member

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    this is for an expy 03 4.6

    so this week the truck started idle rough. like it was gonna stall. but it keeps running. i replaced the IAC last year when it had the same symptoms and it fixed it. but now its back again. any advice on where to look. thank you
     
  2. riphip

    riphip Full Access Members

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    Look at VACUUM LINES FIRST. Easiest/cheapest thing to check and replace. Age,miles and heat deteriorate the rubber and causes leaks. PCV lines also (vacuum)
     
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  3. Harry

    Harry Active Member

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    where do i find the PCV LINE? i also disocvered a leaky radiator hose. which i will replace
     
  4. riphip

    riphip Full Access Members

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    Ck passenger side valve cover. Remove battery & check hose (vac) attached to vac reservoir, etc.

    I knew all of mine needed replacing so I pulled the plug and did them all. Rockauto.com
     
  5. Harry

    Harry Active Member

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    thank you!
     
  6. riphip

    riphip Full Access Members

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    You are more than welcome. Vacuum lines can be so problematic after mileage, years and heat under he hood, Found that out on my antique Ford diesel trucks. Check also for moisture/cooling fluids in spark plug areas. The repairs are just hard to get to areas at times. Love my 2004
     
  7. riphip

    riphip Full Access Members

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    PVC is the BLUE Thing in valve cover with hose mounted

    upload_2020-11-21_16-18-4.jpeg
     
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  8. Hamfisted

    Hamfisted Full Access Members

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  9. Harry

    Harry Active Member

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  10. Harry

    Harry Active Member

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    one more thing. where would i find the throttle positioning sensor?
     

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