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01-12-2002, 09:56 PM | #1 |
Scooby Specialist
Member#: 1997
Join Date: Jul 2000
Chapter/Region:
MWSOC
Location: Des Plaines, IL
Vehicle:2006 Acura TL 6spd STMGM6 alumni |
how to test a coil pack?
So.... how do you figure out if a coil pack is bad? Tests anyone?
-B
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01-12-2002, 11:36 PM | #2 |
Scooby Specialist
Member#: 8465
Join Date: Jul 2001
Chapter/Region:
NWIC
Location: Puget Sound, WA
Vehicle:'00 2.5RS Coupe, AW '93 GMC Typhoon AWD |
To check for an igniter voltage signal to the coil pack, remove the electrical connector from the coil pack. Connect a 12 volt test light to the battery positive terminal. Make sure it is an LED (Light Emitting Diode) type test light. Touch the test light probe to each of the outside terminals of the coil pack connector in turn as an assistant cranks the engine over with the starter. See if the test light blinks as the igniter provides the trigger signal to the coil pack. If the test light does not blink, there is a problem with the igniter, crankshaft sensor, ECU or related wiring.
To check the ignition coil's primary resistance, with the ignition off, disconnect the three-terminal connector from the coil. Connect an ohmmeter across terminals 1 and 2. This will test the 1-2 coil pack. Next connect the ohmmeter across terminals 2 and 3. This will test the 3-4 coil pack. The resistance should be between 0.63 and 0.77 ohms. To check the ignition coil's secondary resistance, connect an ohmmeter between the companion cylinder coil towers. First test cylinder numbers 1 and 2, then cylinders 3 and 4. The resistance should be between 10.4 and 15.6 k-ohms (?) |
01-13-2002, 06:14 AM | #3 |
Scooby Guru
Member#: 6551
Join Date: May 2001
Chapter/Region:
MWSOC
Location: Carol Stream, IL
Vehicle:'01 GC8 Dinged STM '09 Concours 14 ABS Black |
brian FYI testing the coil itself will honestly tell ya dick...i have seen coils be bad and test perfect and be firing thru the casing. Do you think you have a bad coil?? i'd be curious. Gimme a ring.
jeremy |
05-10-2012, 05:43 PM | #4 |
Scooby Newbie
Member#: 69459
Join Date: Aug 2004
Location: utah
Vehicle:2015 2.0 hatch crystal white |
are those resistances good for all scoobie coils? i have a 99 impreza l, with the n/a 2.2 (ej22 i believe). its misfiring on 3 and 4. i noticed they are both fed by the same coil, so i wanted to test this first before throwing money into it.
thanks. |
11-14-2019, 01:14 AM | #5 | |
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Member#: 494528
Join Date: Nov 2018
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Quote:
Hello Richard, Just wanted to add some relevant information, in case someone is looking for the details too (like me). I have found the tutorials and the peculiar ignition coil features explained by Larry Carley: https://www.aa1car.com/library/ignition_coils.htm |
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11-14-2019, 08:26 AM | #6 |
Scooby Specialist
Member#: 310506
Join Date: Feb 2012
Chapter/Region:
South East
Location: Florida
Vehicle:2005 WRX STi CGM |
To be honest, the way I test coil packs is by swapping them.
This assumes that obviously not ALL of your cylinders are misfiring. Let's say you're seeing misfires on 2 & 3. I would then swap 2 -> 4 and 1 -> 3. Fire up the car and see if the problem (misfire/cylinder roughness) follows the coil pack. If so, then replace the coil pack. If that doesn't fix the issue, swap the spark plugs in the same pattern detailed above. You can even go as far as moving the injectors to diagnose. |
11-14-2019, 09:28 AM | #7 | |
Scooby Newbie
Member#: 475437
Join Date: Oct 2017
Location: Connecticut
Vehicle:2018 WRX White |
Swap Coils
Quote:
e.g. If you have a "cylinder 1 misfire" code, when you swap the you will now have a "cylinder 3 misfire" code. |
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