1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Diagnose this knock?

Discussion in '6.9L IH & 7.3L IDI Diesels' started by Cainon, Apr 5, 2020.

  1. Cainon

    Cainon Full Access Member

    Posts:
    110
    Likes Received:
    31
    Joined:
    Sep 27, 2019
    Location:
    Smithfield


    This is a video of my non turbo 6.9 cold start sitting 2days. New injectors,plugs... everything except IP. Hoping this is just a ip timing. Any help is appreciated. Rev to about 600rpm then 1100rpm then shut off. Also, the shut off seems very rough.is this normal?
     
  2. frankenwrench

    frankenwrench overkill is under rated!

    Posts:
    616
    Likes Received:
    324
    Joined:
    Oct 8, 2017
    Location:
    Weatherford tx
    Sounds kind of normal to me, may need to advance the timing a touch.
     
  3. gearhead4207

    gearhead4207 Registered User

    Posts:
    12
    Likes Received:
    0
    Joined:
    Nov 11, 2019
    Location:
    west point ca
    My 6.9 in my 86 sounded like this when it spun a lifter in its purch and ground a love on the cam
     
  4. gearhead4207

    gearhead4207 Registered User

    Posts:
    12
    Likes Received:
    0
    Joined:
    Nov 11, 2019
    Location:
    west point ca
    Lobe lol
     
  5. SLC97SR5

    SLC97SR5 Full Access Member

    Posts:
    472
    Likes Received:
    151
    Joined:
    Jul 11, 2009
    Location:
    UT
    It sounds pretty good to me. If anything it sounds a little harsh and power strokey which would indicate advanced timing but that seems unlikely as new injectors should want to crack open at a higher psi than old units.

    Have you had it out on the road?

    Where did you source the injectors from?
     
    Dane Rickford likes this.
  6. Dane Rickford

    Dane Rickford Full Access Member

    Age:
    17
    Posts:
    191
    Likes Received:
    179
    Joined:
    Feb 3, 2020
    Location:
    Markleeville, California
    He got his injectors from DCP in Tennessee. About 3 weeks ago @Cainon started a thread about his engine shaking after he put the new injectors in. Here’s a link to that thread:
    https://www.oilburners.net/threads/new-injectors-shaking-at-stop-lights.87548/

    If it was my truck, based off of the video audio, I would retard the timing a hair and run a fuel filter of atf through the injection system and then make the truck do some decently heavy work and just see how it does. That’s just my two cents, but to me the timing sounds too advanced :dunno
     
    Cainon likes this.
  7. Cainon

    Cainon Full Access Member

    Posts:
    110
    Likes Received:
    31
    Joined:
    Sep 27, 2019
    Location:
    Smithfield

    Thanks! Had a hard time posting video in old thread. Sorry for the confusion
     
    Dane Rickford likes this.
  8. papadiesel

    papadiesel Full Access Member

    Age:
    61
    Posts:
    78
    Likes Received:
    26
    Joined:
    Feb 8, 2016
    Location:
    Indianola, IA
    sorry dude, DCP puts out junk, no pop test, tested all over the board from 600 to 2800 on a set I bought, then read the hall of shame. they are not rebuilding, just cleaning and using old parts. it hurts, but the recommended on here, one tests them for you for about 80? He also rebuilds them or buy new stanadynes. ( Yes, you can get them still)
     
    Cainon likes this.
  9. Cainon

    Cainon Full Access Member

    Posts:
    110
    Likes Received:
    31
    Joined:
    Sep 27, 2019
    Location:
    Smithfield


    Yes, I drive it everyday to work about 6 miles round trip so not very far. 60mph road so it drives fine. Shifts little rough into fourth sometimes but feel like thats my driving. It's just that knock/tick gets faster with rpm. So I figured I'd double check here. And from previous post I have read. A 6.9 non turbo should be rather slow. Mine pulls like it's getting more fuel then needed.
     
  10. IDIBRONCO

    IDIBRONCO IDIBRONCO

    Posts:
    5,360
    Likes Received:
    3,604
    Joined:
    Feb 5, 2010
    Location:
    edmond, ks
    The first thing that I'd before messing around with the timing is to raise your idle speed. If you have to rev the engine to get to 600RPMs, it's idling too slow. That may do as much as anything else for your rough idle. I think that the normal idle speed is 700-800 RPMs. I may be a little high on that number.
     
    Dane Rickford likes this.
  11. Dane Rickford

    Dane Rickford Full Access Member

    Age:
    17
    Posts:
    191
    Likes Received:
    179
    Joined:
    Feb 3, 2020
    Location:
    Markleeville, California
    94’ idit factory idle speed is 650 rpm, at least that’s what my valve cover said. I would imagine that number applies to both the 7.3 and 6.9
     
    IDIBRONCO likes this.
  12. IDIBRONCO

    IDIBRONCO IDIBRONCO

    Posts:
    5,360
    Likes Received:
    3,604
    Joined:
    Feb 5, 2010
    Location:
    edmond, ks
    So maybe 600-700 is better than 700-800.
     
  13. Dane Rickford

    Dane Rickford Full Access Member

    Age:
    17
    Posts:
    191
    Likes Received:
    179
    Joined:
    Feb 3, 2020
    Location:
    Markleeville, California
    Probably, but having put that rpm number out there, I have to confess mine is set at 775-800 for cold starting since my high idle actuator is broken :rolleyes::joker:
     
  14. IDIBRONCO

    IDIBRONCO IDIBRONCO

    Posts:
    5,360
    Likes Received:
    3,604
    Joined:
    Feb 5, 2010
    Location:
    edmond, ks
    It may be higher for a truck with an automatic transmission too.
     
  15. papadiesel

    papadiesel Full Access Member

    Age:
    61
    Posts:
    78
    Likes Received:
    26
    Joined:
    Feb 8, 2016
    Location:
    Indianola, IA
    poor injectors will do just that, I have an 89 auto 4x4, idles best at 750 in drive with brake on, recommended is 700 plus for auto
     

Share This Page