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Testing TBI coil??

This is a discussion on Testing TBI coil?? within the Technical / Maintenance forums, part of the General Discussion category; How do I test my ignition coil to see if it is good or junk....

  1. #1
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    Testing TBI coil??


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    How do I test my ignition coil to see if it is good or junk.

  2. #2
    Original Gold Member 97Silverado's Avatar
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    Re: Testing TBI coil??

    This testing procedure is valid for just about any automotive coil. Using an ohmmeter, check the resistance between the side terminals of the coil. Do this with all of the wires to the coil disconnected. You should see 0.75 to 0.81 ohm of resistance. Then check the resistance between either side terminal and the center high tension terminal. The reading should be 10,000 to 11,000 ohms. Any significant deviation from these numbers would indicate that the coil is defective.

    Last edited by 97Silverado; 01-26-2007 at 10:26 AM.


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    Re: Testing TBI coil??

    Quote Originally Posted by 97Silverado
    This testing procedure is valid for just about any automotive coil. Using an ohmmeter, check the resistance between the side terminals of the coil. Do this with all of the wires to the coil disconnected. You should see 0.75 to 0.81 ohm of resistance. Then check the resistance between either side terminal and the center high tension terminal. The reading should be 10,000 to 11,000 ohms. Any significant deviation from these numbers would indicate that the coil is defective.

    umm i could be wrong, but that isnt the coil he has. there is a way to test the coil but i don't know how to post it here. there is a procedure in the haynes manual tho.

  4. #4
    Chevy truck owner The_Ogre25's Avatar
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    Re: Testing TBI coil??

    That may not look exactly the same as the coil he has but pretty much all coils have the pos, and neg terminals and the coil wire plug.

  5. #5
    has a manual! Whifflebat's Avatar
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    Re: Testing TBI coil??

    I looked at mine today when I did my cap and rotor. Its got the main high tension lug, and then 4 other terminals. Looking from the front of the truck, theres a pair on the left that goes to the distributor, those aren't the wires you're looking for. The terminals you want are on the right side, whose wires disappear in to the loom. Those are the 2 side lugs marked on the drawing above. I checked my coil and I got about 9kohms between the big lug and a side lug, and about .67 between the two little ones. A little bit out of spec but it runs great...
    Last edited by Whifflebat; 01-27-2007 at 03:31 PM.
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  6. #6
    GMC RULZZ NEUMANNZZ's Avatar
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    Re: Testing TBI coil??

    autozone has the procedure go here:http://www.autozone.com/servlet/UiBr...3d80085d3a.jsp
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    Re: Testing TBI coil??

    Will this tell me if it is weak or just bad?

  8. #8
    GMC RULZZ NEUMANNZZ's Avatar
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    Re: Testing TBI coil??

    it will tell you to replace it if its not within specs.
    O2 GMC RCSB 4.8L V8 AUTO 3.73's
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