Confirm out of spec Coil Pack?

[xxShaneOmac]

I dont do this often but due to my car being a no start with a great crank and I know its getting gas I am checking spark.

I tested my Coil pack per what I believe chiltons told me. I used a Cheapo Craftsman Ohm meter set at "200" (I am not sure what these settings mean) and I got 1.2 and 1.1 for the primary resistance. Per the manual that is out of the .70 .86 spec range.

1. Does this mean that my coil pack is bad and I need to replace it?

2. Would it be a faulty test if the room was at appx 55 degrees instead of the 70-80 degree temp they say is normal conditions to test at?

3. Would an AutoZone / PepBoys Coil Pack be good enough for a 350whp car looking to make more power or should I go with OEM?

PS, I also tested the Secondary reisistance between each coil and with the Ohm Meter set to 20k I got 12.86 appx for each, I assume that is 12,860 or in range of 11,500 to 15,300. Please let me know either way.

Thanks

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[Colt4G63 also]

Chances are the Chiltons is wrong. Those worthless books have never given me usable info about OHM specs. Furthermore, that coil pack has two individual coils; what are the chances they both failed simultaneously? Lastly, those coils are damn good, and I have never seen one go bad in all my years of repairing cars professionaly, and I have been in the business since the days of carburators.

 

[serviceguy]

Before you can say the coil pack is out of specs you need to set the multimeter with the correct scale and check it properly. What you need to check is the coils primary (at the harness connector) and secondary (at the spark plug connector side) individual resistance thus you need to set your multimeter as an ohm-meter in your case the lower left quadrant of the meter as I believe you did. Use the setting with the lowest number (scale, or end scale meaning the higher value measurable with that scale) or the measure will not be accurate. You can find the specs for a 1g on this post here but the procedure for a 2g and possibly the specs wold be the same.

Added the specs for you:

 

[xxShaneOmac]

Thanks serviceguy that is pretty much exactly what I did with the OHM meter and they were out of spec.

I brought the coil pack inside to let it warm to 70 degrees and when OHM testing the primary I got 1.8 that slowly dropped to 1.2 ohms.

Could someone with a good starting non CEL / Misfire car check their primary and see if this is in some decent range or if once it climbs above spec its bad for sure.

Thanks.

 

[FilmerDude]

Was this ever solved? My secondary is in spec but my primary is 2.5

 

[luv2rallye]

0.70-0.86 ohms is the Mitsu spec for a new 2g coil primary. However it's not unusual to see a little over 1 ohm when it gets warm or old and yet you still can get spark (perhaps not quite as strong but strong enough to run engine). A better test is to see how strong the actual spark is:

2g coil spark test:
Place a screwdriver in the 2/3 coil's secondary high voltage output terminal (or a spark plug cable end of either plug 2 or 3. Keep screwdriver shank (or an attached wire to it) 1/8" from ground metal so a spark can jump across to ground (simulates spark plug gap). Unplug the power transistor and connect a wire to the blue-black wire's pin of the harness. Make sure you have gloves on and stand on a dry rubber mat. Turn ignition key to on. Now touch the other end of the wire to ground for a second (charges coil - may see spark where touching to ground due to high current-normal). Now remove wire from ground and you should see the spark (> 30KV) jump the gap from the screwdriver shank to ground (may also see small spark where you removed wire-normal). Repeat with the black-white pin for the other coil for plugs 1 & 4. You should see a strong blue spark.