Welcome to the North American Subaru Impreza Owners Club Thursday March 28, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 01-12-2002, 09:56 PM   #1
Midwayman
Scooby Specialist
 
Member#: 1997
Join Date: Jul 2000
Chapter/Region: MWSOC
Location: Des Plaines, IL
Vehicle:
2006 Acura TL 6spd
STMGM6 alumni

Default how to test a coil pack?

So.... how do you figure out if a coil pack is bad? Tests anyone?
-B
* Registered users of the site do not see these ads.
Midwayman is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 01-12-2002, 11:36 PM   #2
Richard L.
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

Default

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 (?)
Richard L. is offline   Reply With Quote
Old 01-13-2002, 06:14 AM   #3
HndaTch627
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

Default

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
HndaTch627 is offline   Reply With Quote
Old 05-10-2012, 05:43 PM   #4
nfisheremti
Scooby Newbie
 
Member#: 69459
Join Date: Aug 2004
Location: utah
Vehicle:
2015 2.0 hatch
crystal white

Default

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.
nfisheremti is offline   Reply With Quote
Old 11-14-2019, 01:14 AM   #5
TerryLewis
*** Banned ***
 
Member#: 494528
Join Date: Nov 2018
Default

Quote:
Originally Posted by Richard L.
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
buy essays cheap and write down the results for 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 (?)

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
TerryLewis is offline   Reply With Quote
Old 11-14-2019, 08:26 AM   #6
BeastianSTI
Scooby Specialist
 
Member#: 310506
Join Date: Feb 2012
Chapter/Region: South East
Location: Florida
Vehicle:
2005 WRX STi
CGM

Default

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.
BeastianSTI is offline   Reply With Quote
Old 11-14-2019, 09:28 AM   #7
De36
Scooby Newbie
 
Member#: 475437
Join Date: Oct 2017
Location: Connecticut
Vehicle:
2018 WRX
White

Default Swap Coils

Quote:
Originally Posted by BeastianSTI View Post
To be honest, the way I test coil packs is by swapping them...

I would then swap 2 -> 4 and 1 -> 3...
Yes, swap coils is the fastest, easiest and most accurate way. You will have a misfire code (check engine light) if a coil is bad.

e.g. If you have a "cylinder 1 misfire" code, when you swap the you will now have a "cylinder 3 misfire" code.
De36 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2000 RS: How to unplug the coil pack Rallly2000 Newbies & FAQs 0 03-22-2010 12:58 PM
how to test coils? Terrh Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 19 11-09-2009 08:22 PM
How to test Coil Packs Subie.Dude Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 16 03-09-2009 10:12 PM
How To Test Coil Pack WiredWRX Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 2 12-06-2004 07:44 PM
Instructions on how to install OEM gauge pack jbogli Electrical & Lighting 2 03-14-2003 12:02 PM

All times are GMT -4. The time now is 01:13 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.