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My truck is running like crap!!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Frogg89, Jun 26, 2004.

  1. Frogg89

    Frogg89 Registered Member

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    If anyone has ideas, Id appreciate the feedback. My Blazer has a new engine with a Holley TBI and it just starting running bad!! Gas comes out the exhaust pipe not burnt and it seems to be a timing problem but the timing is still set perfectly. The plugs were fouled and I changed them, but no good!!I also put an ignition module I had laying around in it,nothings changing!! I am getting a check engine light for the temp sensor for the computer, Could that be it?? Im trying to avoid putting it in the shop!! /forums/images/graemlins/confused.gif

    Thanks, Ken
     
  2. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Going out on a limb here, but change your coolant temperature sensor.
     
  3. k20

    k20 3/4 ton status

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    that could cause it, its the one in the manifold not the one in the cylinder head. Yours is probably stuck cold thereby givin the motor too much gas. Mine went bad and stuck on hot, keeping the truck from starting because when hot it leans out.
     
  4. Frogg89

    Frogg89 Registered Member

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    Its the one in the cylinder head!!
     
  5. Frogg89

    Frogg89 Registered Member

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    I wasnt sure because the truck been having probs since thursday and the code just came up today!!!

    Thanks, Ken
     
  6. K5er4Life

    K5er4Life 1/2 ton status

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    What are you running cam, fuel pump and engine combo wise. I got a 383 with a fairly large cam, for fuel injection, and currently I need more chip tuning as mine still runs on the rich side. Also I am assuming that you are talking about the 670 that you have?
     
  7. dyeager535

    dyeager535 1 ton status Premium Member

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    Any local auto parts places put a scanner on the ECM for you for cheap/free?

    Coolant temp sensor error is really easy to prove.

    It IS a common failure as these setups go, and the code is pointing you in the right direction, but I'd still want to make sure the wires leading to it aren't damaged before just replacing it. Real easy to do with a scanner (not a code reader) hooked up to it.
     
  8. k20

    k20 3/4 ton status

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    unless youve swapped your sensors around, the one in the head is for the gauge and the one in the manifold is for the computer.
     
  9. Frogg89

    Frogg89 Registered Member

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    Well, for $20 bucks, I replaced both temp sensors and That did the trick. Its running pretty smooth now!!! Thanks for all the input guys!!!! /forums/images/graemlins/k5.gif /forums/images/graemlins/waytogo.gif
     

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