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.

problems running right

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by therover87, May 25, 2002.

  1. therover87

    therover87 1/2 ton status

    Joined:
    Jun 24, 2001
    Posts:
    139
    Likes Received:
    0
    Location:
    Long Island, New York
    i have an 87 k5 350 tbi and when i start it up in the morning it runs mint, idles great and it smooth after 5 minutes the idle will jump all over the place and it will be surging i have replaced the fuel pump, fuel filter, strainer, plugs, cap, rotor, wires, coil, egr valve, o2 sensor, pcv valve, if someone could help with me it would be appreciated, thanks.
     
  2. abusedtrucks

    abusedtrucks Registered Member

    Joined:
    May 11, 2002
    Posts:
    76
    Likes Received:
    0
    Location:
    Upsala , MN
    Take it to a shop.

    hehe...
     
  3. Can Can

    Can Can Pusher Man Staff Member Super Moderator

    Joined:
    Feb 17, 2000
    Posts:
    15,552
    Likes Received:
    136
    Location:
    Cochrane, Alberta, Canada
    Jeez, does anybody have any ideas??? It sounds like the brother has replaced all the parts that could cause this problem.......

    I'd be curious to hear what others say because my brother-in-law's 91 is doing something similar.
     
  4. BrianDamage

    BrianDamage 1/2 ton status

    Joined:
    May 14, 2001
    Posts:
    753
    Likes Received:
    0
    Location:
    Alabama
    have you used a code checker to check the codes?
     
  5. YtseJam

    YtseJam 1/2 ton status

    Joined:
    May 19, 2002
    Posts:
    147
    Likes Received:
    0
    Location:
    CT USA
    Does the Service Engine Soon light come on? Are you getting an EST error code? Did you check for DTC'S? It loses power after it gets hot, Is the Catalytic converter restricted?
     
  6. YtseJam

    YtseJam 1/2 ton status

    Joined:
    May 19, 2002
    Posts:
    147
    Likes Received:
    0
    Location:
    CT USA
    Also check for a vacuum leak @ the base of the Throttle body. Spray carb clean at the base of the TBI and see if the idle changes, The base gaskets get sucked in and cause a large vac leak, the IAC tries to compensate.
     
  7. Haulgas

    Haulgas 1/2 ton status

    Joined:
    Mar 25, 2001
    Posts:
    208
    Likes Received:
    0
    Location:
    Phoenix Az
    I had the samething on my 87 it was the water temp sensor
    Try that.
     

Share This Page