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How do I check the Jet size in my carb

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BRN78BLAZER, Jun 3, 2003.

  1. BRN78BLAZER

    BRN78BLAZER 1/2 ton status

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    Location:
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    I've been having a lot of trouble with my rebuilt carb, 2bbl rochestor. Its on my 78 305 4 spd blazer, an dthis vehicle has the heavy duty emission option which means from the factory no cat, no canistor and definatly no egr. I just found out that if you put an egr carb on a non egr engine it will run to rich and cause sluggishness and other things because the jets are different. Well it does run rich and sluggish, and it just had a tune up a few weeks ago.

    The fix is to have the carb rejetted, but Ineed to know first how do I measure the juet size? And how do I relpace them?

    Any carb experts out there please help,cause this could be whats wrong.

    Thanks in advance - Steve.
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    [ QUOTE ]
    I just found out that if you put an egr carb on a non egr engine it will run to rich and cause sluggishness and other things because the jets are different.

    [/ QUOTE ]

    Actually that should be backwards. The addition of EG(R) requires less air/fuel in the cylinder, so the manufacturer could lean the rods and/or jets out for cruising.

    EGR has no effect on idle or WOT if its working right.

    Dunno about the 2 barrels, but the Q-jets have to have the air horn removed to check the primary rods, and jets.
     

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