Question about 1999 Chevrolet Blazer

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I currently own a 99 Blazer, 6cyl 4.3L, 4 door, auto trans. My check engine light is on, and the local shops cant pinpoint the problem, except that cyl 2, 4 and 6 are randomly misfiring. I have changed just about everything: the distributor, cap, and rotors, O2 sensors, crank shaft sensor, coil, spark plugs, plemon gasket, spider fuel injector, and recently had my fuel pump evaluated. Is there something else that could be making the whole left side misfire? The misfiring is making the truck shake, even when not moving, and the truck does not idle high.

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  • clubberx0708 Jun 24, 2009

    so would i have to get the factory Cap?

  • Anonymous Mar 19, 2014

    Drove the truck 200 miles srvice engine light came on hooked it up to a computer it said misfire need a tune up changed all parts, then when I changed the fuel filter it would not start the fuel pump was changed about two years ago, also changed spider injectors at the same time has It has 192000 on it

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  • Chevrolet Master
  • 3,854 Answers

If you not running the OEM cap and rotor that's where your problem may be. The after market cap and rotor is not as heavy as the OEM and when the two screws that hold down the cap to the distributor is torqued to high,it warps the cap and that's where your problem may be. Remove the cap and inspect the inside and look for abnormal arching, you may want to replace the cap and rotor again. The other thing to is the breather screen in the distributor is known to get plugged up with dirty creating condensation which promote corrosion in the distributor there was a service bulletin from GM to service the screen when working on the distributor or during tune up's. Good luck and hope this helps. Keep me posted, be glad to help.

Posted on Jun 23, 2009

  • Harvey N Tawatao
    Harvey N Tawatao Jun 24, 2009

    It looks like you have touched everything that needed to be replaced. You can try taking the cap back off and placing it back in there, just to make sure it's sitting in right. I used to have to replace the rotor and cap once a year when i was using a after market rotor and cap from Auto Zone. Then one day they didn't have one so i went down to the dealer across the street and picked up an OEM. The rotor and cap lasted three years with out any problems and i drive like 140 miles round trip to work almost every day. I found there are just certain things you can't ho cheap to save money. Jimmy is over 345,000 miles now and still moving strong, as long as i keep up with the maintenance. Little tip is when you lube your front end and U joints, use marine grease, it cost more but it's thicker and resist water better. Keep me posted be glad to help, = Drive a tour bus and work at a speed shop. Here is the firing order again just in case the wires got crossed. 1-6-5-4-3-2. The engine on drivers side radiator to firewall 1-3-5 
    The engine on passenger side radiator to firewal 2-4-6
    The cap on drivers side radiator to firewal 3-1-5
    The cap on passenger side radiator to firewall 2-4-6-coil

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