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Beating my head agaisnt the wall

Discussion in 'The Garage' started by Jemaddux, Jul 2, 2005.

  1. Jemaddux

    Jemaddux Registered Member

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    F@@k OFF
    Any ideas anyone???? I have a 79 blazer with a 350. I just rebuilt the engine, EVERYTHING in the engine is new. Now, the engine fires up with no problem at all and idles just fine. Hit the gas at a stand still and the engine runs great, powers right up with no problems. The vaccuum is is great, spark is great. My problem is as soon as I put is in gear and put a load it has no balls at all. I get nothing put a really rough engine running with a lot of spuddering and no power. The only part not new in the engine area is the carb. Can this be the problem or should I be looking for something else? I would think that at idle that it would run rough if it was a valve problem put I am not sure at this point. Anyone have any ideas here??????

    James :confused:
     
  2. 1-ton

    1-ton 1/2 ton status Premium Member

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    could be an ignition problem. When a load is placed on it the ignition could be breaking down.
     
  3. diesel4me

    diesel4me 1 ton status Premium Member

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    Yup!!

    I agree,it could be ignition--weak spark will snuff out under a load..

    I had borrowed my dads Chevelle wagon years ago--got 15 miles away,and I stopped for a soda..got back in,it started fine,ran perfect!--but the minite I shifted into drive and tried to give it any throttle,it would sputter and stall!--put it back in park,it started and ran perfect again!--but I could not drive it out of the parking lot!...Luckily I was near a parts store about 1/4 mile away--I bought a new distributor rotor,when I looked at the original one it looked like a dime store cheapie,and had carbon tracks all over it(this car had points!)...bought a new rotor,put it in,and it not only fixed it,my dad said the car never had that much power since he bought it!.. :laugh:

    It could be a weak coil,module failing if its HEI,or low voltage to the pink wire at the HEI distributor..if you added HEI to an old truck that had points,you need a 12 gauge hot wire to the fuse box with power only when the key is "ON"...if you use the OEM coil wire,its a resistor wire that only has about 9 volts at reduced amperage--and HEI will only start and run at idle and no-load with that kind of voltage..

    Might see if your EGR valve is hooked up right too(if you even have one!)--if the wrong vacuum hoses are connected to it,it will open at the wrong time,and could stall the motor out..

    Check the fuel pump pressure and volume too--it might be getting only enough fuel to idle at no load due to a bad fuel pump,clogged filter,or a stuck float..good luck--sometimes rebuilding the engine is the EASY part...getting all the bugs out can be more difficult!.. :crazy:
     
  4. 87BrnRsd

    87BrnRsd 1/2 ton status

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    Did you check the timing? Should be 8* BTDC
    -Harrison
     
  5. dodgedude99

    dodgedude99 1/2 ton status

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    as stupid as it sounds, have you installed the plug wires in the correct spot?

    i had mismarked the wires on my dodge when i installed the originally, when i went to swap new wires in i forgot, i had 2 cyls swapped and it idled fine, as soon as i put it in gear it would shake and vibrate and run rough.
     
  6. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

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    I going with timing chain or distributor off by a tooth, just my guess
     
  7. blazinzuk

    blazinzuk Buzzbox voodoo Premium Member GMOTM Winner

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    I had a similar problem with a samurai it ending up being the fuel pump plenty of pressure volume when idleing but didn't mantain the pressure and volume under load, took a while for me to figure this one out
     
  8. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Don't rule out a bad power brake booster. While idling in park i have seen where they don't leak vacuum but once you step on the brake pedal and drop it in gear they leak like hell. Just a suggestion, but one that shouldn't be overlooked.
     

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