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how do you test coil packs?

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Old 05-25-2008, 03:01 AM   #1
92xltriceeater
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how do you test coil packs?

besides spark being totally absent how can you test coil pack? getting poor gas mileage and just did a full tuneup and wanna make sure my coil packs are still good and strong???
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Old 05-25-2008, 03:05 AM   #2
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Check the resistance of each one, and compare the results.
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Old 05-25-2008, 03:15 AM   #3
92xltriceeater
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key on engine off? while cranking?
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Old 05-25-2008, 03:32 AM   #4
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Remove the entire coil, and test its resistance. Do one at a time.
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Old 05-26-2008, 03:49 PM   #5
btprofessional
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what should the resistance be?
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Old 05-26-2008, 09:56 PM   #6
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Quote:
Originally Posted by btprofessional View Post
what should the resistance be?
idk, gm waste spark coil packs are like 40-60k ohms

but you could always just compare them, if one is way off from the others then it is probably bad
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Old 05-26-2008, 11:13 PM   #7
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Get some on to sick a screw driver on it and crank it. If they scream then it's fine. Mint need 6 friends to check them all tho. lol
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Old 05-27-2008, 02:59 AM   #8
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^^^^^^^^^

this test works pretty good.

Dont forget to check the degree of burn on there hands. this can be a good indicator of coil condition.

also make them sign a waver before hand. i forgot and the judge didn't seen to understand the logic behind my train of thought that led to the test.




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Old 05-27-2008, 01:23 PM   #9
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Anything less than a 3rd degree burn indicates a bad coil




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Old 05-27-2008, 02:02 PM   #10
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You for got the smoking hair too.
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Old 08-02-2008, 04:41 PM   #11
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I have my coil packs off, but I'm confused as to how to check the resistance. My multimeter keeps reading "1" no matter what I do. What exactly do I touch to what?

Thanks




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Old 08-02-2008, 10:25 PM   #12
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Is your multimeter a digital autoranging model?
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Old 08-02-2008, 10:55 PM   #13
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Is your multimeter a digital autoranging model?
It's digital, but it has various ranges that need to be set manually.




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Old 08-02-2008, 11:19 PM   #14
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Maybe it's in the wrong manual range?
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Old 08-02-2008, 11:20 PM   #15
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Maybe it's in the wrong manual range?
I tried them all.




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Old 08-02-2008, 11:29 PM   #16
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1. Turn the ignition switch OFF, disconnect the battery, then detach the wiring harness connector from the ignition coil to be tested.
2. Check for dirt, corrosion or damage on the terminals.

PRIMARY RESISTANCE
Use an ohmmeter to measure the resistance between the following terminals on the ignition coil, and note the resistance:
1. B+ to Coil 1
2. B+ to Coil 2
3. B+ to Coil 3

The resistance between all of these terminals should have been between 0.31.0 ohms. If the resistance was more or less than this value, the coil should be replaced with a new one.

SECONDARY RESISTANCE
Measure, using the ohmmeter, and note the resistance between each corresponding coil terminal and the two spark plug wire towers on the ignition coil. The coil terminals and plug wires towers are grouped as follows:
1. Terminal 3 (coil 1) spark plugs 1 and 5
2. Terminal 2 (coil 3) spark plugs 2 and 6
3. Terminal 1 (coil 2) spark plugs 3 and 4
If the resistance for all of the readings was between 6,50011,500 ohms, the ignition coils are OK. If any of the readings was less than 6,500 ohms or more than 11,500 ohms, replace the corresponding coil pack.




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Old 08-05-2008, 08:29 AM   #17
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Ah, well that makes more sense. Thanks.

I got around 13.54 - 13.76 K between the 4 pairs. I compared those numbers to another set of identical coil packs and got numbers that were a little higher, 15.03 - 15.22 K. So seeing as the numbers on my coil packs were all in same ballpark and close to a set that a pulled of an Explorer that has no idle/hesitation trouble, are my coil packs OK?




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