1997 5.4 Expedition bad misfire...HELP PLEASE!!

Discussion in '1st Gen - 1997 - 2002' started by craneop1994, Aug 9, 2017.


  1. ChrisOIFdoc

    ChrisOIFdoc Full Access Members

    Posts:
    240
    Likes Received:
    50
    Joined:
    Jul 21, 2017
    Location:
    Rio Rancho, NM
    Timing chain
     
  2. ChrisOIFdoc

    ChrisOIFdoc Full Access Members

    Posts:
    240
    Likes Received:
    50
    Joined:
    Jul 21, 2017
    Location:
    Rio Rancho, NM
    Meaning anything and everything related to the timing
     
  3. craneop1994

    craneop1994 Member

    Age:
    45
    Posts:
    5
    Likes Received:
    0
    Joined:
    Aug 7, 2017
    Location:
    St. Augustine, FL
    Thanks after looking at diagrams the long chains make sense.
     
  4. ChrisOIFdoc

    ChrisOIFdoc Full Access Members

    Posts:
    240
    Likes Received:
    50
    Joined:
    Jul 21, 2017
    Location:
    Rio Rancho, NM
    Any luck?
     
  5. Kermit

    Kermit Full Access Members

    Posts:
    144
    Likes Received:
    4
    Joined:
    May 8, 2014
    Location:
    NwPa
    Just curious Chris, but why do you think timing chain? Because of the marble noise or the codes? Honestly curious here, not trying to be an ass or anything, just wanna pick ur brain.

    For the op...I had a similar issue with my 99 expy... sputtering, loss of power, engine was "loping" (personally I call it surging, the p.o.s mechanic called it loping) etc, threw the 1401 code and 2 codes for upstream o2 sensors, and a code for misfire on cyl 4. The p.o.s mechanic tried convincing me it was intake gasket (personally I think he was after the $700 gasket job but really knew it was pcv line). After replacing the 02s and the egr valve (needed done anyway, it was cheap and they were original parts with 230k on them) turned out to be a vacuum issue. Replaced the pcv line and voila, ran like a champ. So the p.o.s mechanic was right on 1 point, it was a vacuum issue but no where near as bad as the intake gasket.
     
    Last edited: Sep 12, 2017
  6. ChrisOIFdoc

    ChrisOIFdoc Full Access Members

    Posts:
    240
    Likes Received:
    50
    Joined:
    Jul 21, 2017
    Location:
    Rio Rancho, NM
    Timing chain was my quick response, but anything related to the timing was my suggestion because of the misfires in combo with the marble sound. Seems to me like it jumped time. Hopefully the guy will respond to the thread and let us know what he found.
     
    Kermit likes this.
  7. Kermit

    Kermit Full Access Members

    Posts:
    144
    Likes Received:
    4
    Joined:
    May 8, 2014
    Location:
    NwPa
    How does the marble sounds relate to timing Chris?
     
  8. ChrisOIFdoc

    ChrisOIFdoc Full Access Members

    Posts:
    240
    Likes Received:
    50
    Joined:
    Jul 21, 2017
    Location:
    Rio Rancho, NM
    Pre-ignition during the compression stroke, loose chain hitting the cover, valves rattling, etc.. all with misfires.

    If you have an older vehicle with a distributor...get your crows foot...loosen it...start turning it out of time and you will hear what I'm talking about.
     

Share This Page