Question about 1985 Dodge Ram 3500

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Wont pass emissions Co to high new air pump tune up made little diff

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The engine operating temperature should be on the higher side to get better burning of fuel inside the engine along with heated air to the carburetor. Has the air/fuel ratio been checked? The catalytic converter(s) have a direct effect on emissions. The EGR valve must work correctly. There a pair of check valves in the air injection system that may be plugged. Make sure that the ignition system is making hot sparks with good plugs--new ignition wires. Getting carburetor type engines to pass emissions can be a real pain.

Posted on Sep 26, 2009

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Fuel mixture too rich. Is that carbureted or fuel injected?

Posted on Sep 26, 2009

  • Mike Butler
    Mike Butler Sep 26, 2009

    Please add engine info & what else has been done, as in new air filter etc., or anything else you've tried.

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Unless service engine light is on,indicateing a problem,you could try removing air filter from housing ,long enough for it to be tested.clean inside of box & replace lid.

Posted on Sep 26, 2009

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Change spark plugs,wires,cap and rotor if they are over 24,000 miles
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Do a quick wipe down on the wires and cap to take the moisture off.

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Please post more information on the comment window.

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