How to check coil packs?

Reply Subscribe

Thread Tools

Search this Thread

Mar 11, 2008 | 05:02 PM

DTSNGIT

Thread Starter

Staging Lane

iTrader: (4)

Joined: Dec 2003

Posts: 52

Likes: 0

How to check coil packs?

I think I may have a bad coil pack. Does anyone know how to check the packs? Can you ohm them or something to determine their condition?

Mar 11, 2008 | 05:05 PM

Scoggin Dickey

LS1TECH & Trucks Sponsor

iTrader: (34)

Joined: Mar 2002

Posts: 3,523

Likes: 35

From: Lubbock, TX

What leads you to believe you have a bad one? Knowing this can lead to a more simple and direct method of checking in different situations

__________________

800-456-0211 / PM / Facebook
WHIPPLE Superchargers, Procharger, Magnuson, Powerbond Sale, HPTuners packages!, Trickflow, AFR, PRC, CHE Trunion upgrade, $100 7.400" pushrod set, Custom Cam of your choice

Mar 11, 2008 | 05:25 PM

Sales2@Texas-speed

LS1Tech Premium Sponsor

iTrader: (5)

Joined: Jan 2008

Posts: 5,053

Likes: 7

From: Texas!

Yes, it is possible to check the resistance across the primary and secondary windings to get a good idea if they are good or bad. Somewhere floating around there is a chart listing the standard resistance levels for both primary and secondary with a range for hot and cold (since temperature does affect the resistance).

But, like Jesse said...sometimes posting the issues you're having and reasons you suspect the coil(s) might be bad can help diagnose your problems. Are you seeing any DTC's (service engine light)? If so, what is the numbers of the code(s) being thrown?

__________________

Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!

COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!

Mar 11, 2008 | 05:44 PM

johnnywhale

Teching In

iTrader: (3)

Joined: Aug 2007

Posts: 24

Likes: 0

Most GM coils I've measured seem to be between 6k and 10k ohms on the secondary side. It seems to be more important that they're all the same (within a couple hundred) than right on spec. If one is off it can give a miss especially under load. Measure from a primary wire to the tower.
Johnny

Mar 11, 2008 | 06:47 PM

DTSNGIT

Thread Starter

Staging Lane

iTrader: (4)

Joined: Dec 2003

Posts: 52

Likes: 0

I don't actually have any car problems or symptoms. I've got a friend whom bought a set of coil packs and wants to check them to ensure he bought coils that work before using in his motor buildup.

Any thoughts?