Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

i got knocked out

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by usmcanson, Aug 30, 2005.

  1. usmcanson

    usmcanson Registered Member

    Joined:
    Aug 30, 2005
    Posts:
    16
    Likes Received:
    0
    Location:
    havelock,nc
    i just bought a 87 k5 with 350 tbi. 6inch suspension 3inch body lift. with 38's. Everything else is pretty much stock. Owner told me he put a new map sensor in it because the plugs kept fouling other than that there was nothing wrong. I did the usual, new plugs, wires, dist.cap rotor, new air filter, pcv valve. On the ride home ( 3 hours ) i noticed it got a little hot a couple of times. Now it is knocking and my oil pan gasket is bad. Bought a new oil pan gasket. Tried the trick with pulling plug wires. Noise stopped when i pulled #4 cylinder. Took out both rods and there is nothing wrong with them. I don't know what else it could be. Also it does not want to idle for me either. could this be one in the same or did i stir something up with the long drive.
     
  2. uglyangelracing

    uglyangelracing 1/2 ton status

    Joined:
    Jun 6, 2005
    Posts:
    271
    Likes Received:
    0
    Location:
    Rhode Island
    If its a knock did you drop the oil pan and check number 4 cylinder connecting rod bearing?
     
  3. usmcanson

    usmcanson Registered Member

    Joined:
    Aug 30, 2005
    Posts:
    16
    Likes Received:
    0
    Location:
    havelock,nc
    not yet. I have a four day weekend coming up and that's when i want to really get into it. this knock only happens if i rev it up or when i am accelerating....how hard is it to replace the bottom connecting rods??
     
  4. danny7139

    danny7139 1/2 ton status

    Joined:
    Jan 27, 2005
    Posts:
    227
    Likes Received:
    0
    Location:
    florida
    I wouldn't go along with the wheeling until you fixed the knock, could further damage something or other things. Changing out the connecting rod aint that hard.
     
  5. big pappa b

    big pappa b 3/4 ton status

    Joined:
    Jan 3, 2003
    Posts:
    6,328
    Likes Received:
    0
    Location:
    Falcon, Colorado
    is it a load knock or rattle? could be a collapsed lifter maybe :dunno:
     
  6. usmcanson

    usmcanson Registered Member

    Joined:
    Aug 30, 2005
    Posts:
    16
    Likes Received:
    0
    Location:
    havelock,nc
    it is more of a rattle because it doesn't do it when it idles, that is when it will idle. what would i do about a collapsed lifter. I was also told that the timing has to be dead on with these engines, tomorrow i go get the timing light.
     
  7. Emmettology 101

    Emmettology 101 3/4 ton status

    Joined:
    May 9, 2000
    Posts:
    8,126
    Likes Received:
    0
    Location:
    FL
    Timing doesn't have to be dead on. I am running an 89 tbi 383. Right now the timing is retard quite a bit because the PO's engine builer built the engine with too much compression. I was getting pinging at normal timing. With retarded timing the engine still runs decent, but with no pinging.
     

Share This Page