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91 blazer keeps cutting out while driving

Discussion in '1973-1991 K5 | Suburban | Truck' started by OKIEnVA, Jun 8, 2007.

  1. OKIEnVA

    OKIEnVA Registered Member

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    all right guys heres the problem, ill be driving down the road and all the sudden starts cuttin out and then dies. and wont start back up until next day sometimes after an hour or so, was thinkin fuel pump i know im not getting fuel but im also not getting spark, and fuel pump was replaced barely over a yr ago. replaced ignition switch and module so far. any thoughts would be appreciated thanx.
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    It's probably not your fuel pump. If you aren't getting spark, the injectors don't fire, so it will never start.

    Check the easy stuff...fuses, cap/rotor, etc. Good visual inspection.
     
  3. OKIEnVA

    OKIEnVA Registered Member

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    put new cap and rotor on also. the truck starts, so i dont think its a fuse or else it wouldnt start all the time. instead of just die out sometimes. it has died wwhile driving and while idling, once it dies and u turn the key it will get a little kick over for a split second right when u release the tumbler.
     
  4. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    On a GM vehicle that loses spark the first thing to replace is the ignition module, then the pick up coil inside the distributor and lastly the ignition coil. I just had a friend have this happen and it turned out to be a bad pick up coil. You must remove the distributor and pull it completely apart to change that item. It is easy enough to do but sucks that you must pull the dizzy.
     
  5. Thunder

    Thunder 3/4 ton status

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    X2 on the pick up coil. It is what the ECM uses to see a spark reference. If the pick up coil is bad. You will get no spark. ECM sees this and cuts fuel off.
    It is common for them to act up after the engine is warm.
    Also when you changed the dist module did you use plenty of the white grease on the back of it?
     
  6. OKIEnVA

    OKIEnVA Registered Member

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    yea fellas, put plenty of grease under the ignition module, and found out yesterday that im not getting ground to my injectors, and im pretty sure on the pick up coil. so now my question is should i just get a pick up coil or whole distributor? thanx for all the help.
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    If you can't change the pick up coil yourself or have someone do it cheaply for you then i would say buy a distributor. Keep in mind that the rebuilt distributor has used electrical parts in it and could fail soon after you install it. Not saying that a new part won't fail but buying a new part and installing it yourself is definately cheaper and probably less likely to fail in short order than a used electrical item.
     

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