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2000 Yukon Misfire

maxxyukon

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maxxyukon New Member

maxxyukon

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Can anyone tell me the resistance values on an ignition coil for the 2000 Yukon with the 5.3? I have a misfire on the #7 cylinder. Checked the plug and the plug wire and they are both good. It must be the coil that is bad and I don't know how to test it. Neither does Auto Zone or Advance. Any help would be greatly appreciated.

Ape0r Enthusiast

Ape0r

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Can anyone tell me the resistance values on an ignition coil for the 2000 Yukon with the 5.3? I have a misfire on the #7 cylinder. Checked the plug and the plug wire and they are both good. It must be the coil that is bad and I don't know how to test it. Neither does Auto Zone or Advance. Any help would be greatly appreciated.

 

 

 

 

Plug that son of a bitch into another cylinder and see if that cylinder then begins to misfire. Change both the input wire and the plug wire over to another coil.

 

In related news, gmpartsdirect.com has the coils for roughly half of dealer list, send them your VIN and ask them for the correct part number & price, catalog function shows both Delphi and Mitsubishi brand coils.

maxxyukon New Member

maxxyukon

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ok I tried swapping the coil with number 5 and disconnected the negative battery cable to reset the computer. Still had a miss and drove up to Auto Zone. They plugged in the code reader and it still says a misfire on #7 cylinder. Could it be a bad fuel injector? or a bad plug? This is driving me insane!!!

roy67ss Enthusiast

roy67ss

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Check your plug real close. I found hairline cracks in the porcelan on mine. Also, do not adjust the gap - leave it as it comes out of the box. These plugs should not be re-gapped.

maxxyukon New Member

maxxyukon

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I installed a new coil and new spark plug and I still have the miss. I did regap the new plug to .060" since it says that on the underhood tag. It came out of the box at .045".

Ape0r Enthusiast

Ape0r

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Couldn't hurt to try some sea foam. It doesn't seem spark related, so it must be fuel related, get a can of seafoam, use half of it through the intake, and dump half in the gas tank.

mmmikkke Senior Enthusiast

mmmikkke

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Or if you're leary of Sea Foam, get some injector cleaner (Techron?) and see if that helps.

 

You could also have a vacuum leak in the intake for that cylinder, making that cylinder run lean, leading to misfires. So it could be your intake manifold gasket.

 

How did the plug for that cylinder look? Take the plug out and look it over if you haven't examined it yet.

maxxyukon New Member

maxxyukon

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Well, Auto Zones code reader was wrong. It said it had bad primary and secondary resistance on the coil. It was clogged fuel rails and a stopped up injector. Runs great now!

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