Skip to content
Trust My Mechanic
Trust My Mechanic

Your Free Car Repair Advice and Auto Repair Help

  • Home
  • About Me
  • Contact Me
  • A/C and Heater
  • Auto Repair Questions
  • Battery – Alternator
  • Brakes
  • Check Engine Lights
  • Coolant Leak
  • Exterior Care
  • Front End
  • Head Gasket Repair
  • Auto Insurance
  • Auto Loans
Trust My Mechanic

Your Free Car Repair Advice and Auto Repair Help

How To Test Ignition Coils

Austin Davis, December 19, 2012October 2, 2014

Reader Question

I need a little help if you don’t mind.  I’m attempting to test my coil packs.  I found a site that told me what ohms they should read on the primary and secondary sides.  But, I’m not very smart with a voltage meter.  When I’m testing them… where do I touch the red and black wires of the tester… and what ohm setting do I put it on for each side?

Thanks for your help!

 

Hi there

 

It’s really not a good way to test a coil even the best mechanics can get false positives that way. We usually just install a known good coil to prove it or you can use a spark tester plugged into the end of the spark plug boot and watch the spark with the engine running.

But even that can be difficult. It’s the strength and timing of the spark that is important. New coils are cheap so I would just buy one and try it out.

Blessings

Austin Davis

Related Posts:

  • How to test car electrical system with multimeter
  • What Does The Ignition Coil on My Car Do?
  • How To Test A Car Battery
  • How does an ALTERNATOR work ? How to TEST each…
  • How to Fix Diesel Engine Misfire: A Comprehensive Guide
Spark Plugs bad ignition coilhow to test an ignition coiltesting for no spark

Post navigation

Previous post
Next post
  • (no title)
  • Front and rear Brake Pads and Rotors
  • How do disc brakes work in cars and light vehicles
  • How do hydraulic brakes in cars and light vehicles work 3D animation
  • Look at How Far my Project Car has Come in a Year
  • 7 Things You Shouldn’t Do In an Automatic Transmission Car
  • How to Change EVERY FLUID in your Car or Truck 
  • 10 Winter Car TIPS & TRICKS you NEED to Know
  • How Much Weight can you REMOVE from your Car?
  • What Happened to the LEMONS BMW?
  • What it Actually Takes to Race a $500 Car for 24 Hours!
  • How to Install Windshield Wiper Brakes
  • How to Replace a Hybrid Battery in a Prius
  • How To Install A Flex Fuel e85 Conversion Kit In Your Car
  • How To Fix A Leaking Rear Axle 
  • How to Install Windshield Wiper Brakes
  • How to Perfectly Maintain Your First Car
  • How To Make Your Car Last A Long Time – Simple Checks
  • 12 Things To Check Before Buying A Used Car
  • Priced for Perfection: The World’s Most Expensive Cars
  • How To Drive A Manual Transmission + Rev Match + Heel Toe Downshift
  • How to Buy a Car To Flip for a Profit 
  • How to Buy a Used Car Interior and Exterior Inspection
  • How to Inspect a Used Car for Purchase

©2025 Trust My Mechanic | WordPress Theme by SuperbThemes