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Motor is running a little rough..

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by UseYourBlinker, May 27, 2001.

  1. UseYourBlinker

    UseYourBlinker 1 ton status

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    Just started to do it today...I sprayed some carb cleaner in it,and check all the visible smog hose's. Any thing I'm missing?


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  2. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Can you be a little more specific? Tell us what EXACTLY its doing. Does it rough idle or at higher rpm's, etc.

    When In Doubt, Whip It Out!
     
  3. Sparky87k5

    Sparky87k5 1/2 ton status

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    Pull the spark plugs, this will tell you a lot about what is going on inside that engine. Plug wires, are they in good shape?
    Dist. cap and rotor? Checked timing? A "little rough" when? At idle and/or when cruising? Air cleaner condition? Just take one area at a time and check if in good condition or at spec. Could be vacuum leak or out of adjustment carb. A good Chiltons manual is invaluable when working on engines. Read up on what your specs should be and don't be afraid to try tuning. Nothing ventured, nothing gained.

    87 K5, D60 & 14FF, 5 sp & NP208 & 383 stroker. Build it Bulletproof and take it fishing!
     
  4. UseYourBlinker

    UseYourBlinker 1 ton status

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    Just went around the block,and here is what's goin on. There is a little stutter after a complete stop,and when I step on the gas. There is now a a little vibration when decelarating(sp?)


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  5. UseYourBlinker

    UseYourBlinker 1 ton status

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    The idle is about the same,but of the line from a stop is when he can hear the motor kinda bog down...Like it needs more air


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  6. CaptCrunch

    CaptCrunch 1/2 ton status

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    Studder before a stop or after you stop??? what do you mean by studder. If you are getting a hesitation off the line I would look into fuel first... of course pullin a few plugs is also good to read the plugs. Fuel filter and checking the pressure would be next. I'm assuming the tuneup parts including fuel filter are all new or good.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
     
  7. Twiz

    Twiz 1/2 ton status

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    I'd like to "twizt" this around some.

    Think it could be a trans problem? Posibly the 700R4 lock-up converter staying or mabye trying to stay locked up? Try driveing around in just the drive postion, not OD (I think, but I'em not sure that putting the trans in drive, keeps the converter from locking up) Just a guess realy. Hope you get it figured out.

    Twiztid
     
  8. UseYourBlinker

    UseYourBlinker 1 ton status

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    It studder's after I stop,and when I press the gas...It does it in all gears. I'm gonna check the plug wires later today.


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  9. olbluebeast

    olbluebeast Registered Member

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    plug wires need to be checked-borg-warner custom set 30-40 bucks. new plugs split fire models are a bit more but worth it. also make sure the wires aren't touching the block anywhere. they will short.
     
  10. POWERMAD

    POWERMAD 1/2 ton status

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    Split fire plugs????????
    Don't waste your money on those ,AC Delco are just fine.
    And don't go throwing parts at it trying to fix a bug.
    It sounds like a cylinder is not up to speed.
    When was the last time she was tuned up?
    If it was recent then pull the plugs and see what is going on.
    If the plugs look good then run a compression check on it .
    From there you can start to eliminate what is wrong.
    Many different things can contribute to a missfire and alot of tmies it is a simple fix.
    I just went through this on my 73.
    Granted it is a BBC but it drove me nuts trying to figure it out.
    Turns out I have a cam that has gone flat, that is the 2nd one.
    Not that that is what is wrong with yours.
    I drove the ol girl till I finaly had to tow her home.
    By that time there was no deneying that the cam was out.
    again.
    Start with the simple things first. SBC's are a die hard bunch.



    my truck's not dirty, it's earth tone paint
     

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