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how do you test ignition coils and injectors using a multimeter?

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Old Jun 12, 2004 | 01:08 AM
  #1  
michaelnyden's Avatar
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how do you test ignition coils and injectors using a multimeter?

what do you have to test and what reading should I get testing a coil and injector? the chilton is unclear here....
Old Jun 12, 2004 | 04:01 AM
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To Test Ignition Coils:
With the ignition off, disconnect the electrical connector from the ignition coil. Connect the positive (+) probe of an ohmmeter to terminal no. 1 and the negative (-) probe to terminal no. 2 of the coil connector - the meter should indicate infinite resistance. Reverse the meter leads ( negative probe to terminal no. 1 and positive probe to terminal no.2) - the continuity should be indicated, but not zero ohms. If the results are not as specified, replace the coil.
Connect an ohmmeter between the secondary terminal ( the one that the spark plug connects to) and terminal no. 1 - the meter should indicate infinite resistance. If not, replace the coil.
Note - Ohm meter to test coils is not the most reliable way. Some peoples’ coils tested perfectly, but they still misfired.
Old Jun 13, 2004 | 01:33 AM
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i placed the positive lead against pin 1 and the negative lead against pin 2 and put my multimeter into ohm/resistance mode....in one range setting, I got 1.5-1.6 across all the coils and then I switched range settings and got something like 0.5 across the coils
Old Jun 13, 2004 | 01:42 AM
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don't know what any of this means though...
Old Jun 13, 2004 | 09:39 AM
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bump bump bump
Old Jun 14, 2004 | 05:59 AM
  #6  
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If you have intermittent misfires, an ohmmeter test is useless. As these coils weaken, they may misfire only under operating conditions... I had intermittent misfires that set the CEL but would not indicate which cylinder.. ended up replacing all 6 coils..
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