How do I test the coil?
The only safe way to test for spark is to use a spark plug tester tool. If a coil problem is suspected, measure the coil’s primary and secondary resistance with an ohmmeter. If either is out of specifications, the coil needs to be replaced. A coil can be easily bench tested with a digital 10 megaohm impedance ohmmeter.
Can a Chevy Trailblazer ignition coil be defective?
Smell of raw fuel coming out of the tailpipe. If your test results indicate that an ignition coil is defective on your 4.2L Chevrolet TrailBlazer or GMC Envoy then you should that take a look at the following links and comparison shop. I think you’ll save a few bucks by buying it online:
Can a bad spark plug cause an ignition coil to fail?
The ignition coils can fail due to faulty spark plugs – it is actually the most common problem and cause of ignition coil failure. Bad spark plugs can overload the ignition coils and overwork them. If you don’t solve the spark plug issue, the oils will fail again. How Much Does It Cost To Fix The Ignition Coil?
How to test ignition coil pack ignition plug?
Do not use a regular spark plug instead of a spark tester to test for spark. Do not remove the spark plug wire from the spark plug or the ignition coil while the engine is cranking to test for spark. Start your diagnostic from TEST 1, do not skip around from test to test unless instructed to do so by the TEST you are currently on.
How to tell if you have a faulty coil pack?
You need to use ohm meter to test the coil pack for continuity. Make sure you have the approximate ohm values for the coil pack. To find this information, research your car’s engine on the Internet or purchase a Chilton’s or Haynes manual to find out what the mega ohms reading on the coil pack should be. Coil Packs vs. Distributors
What does the ignition coil do on a trailblazer?
NOTE: You can find the ignition system wiring diagram here: Ignition System Wiring Diagram (2002-2005 4.2L Chevrolet TrailBlazer). As you’re already aware the ignition coil’s job is to supply spark to its cylinder. This spark then ignites the air-fuel mixture within the cylinder.
Do not use a regular spark plug instead of a spark tester to test for spark. Do not remove the spark plug wire from the spark plug or the ignition coil while the engine is cranking to test for spark. Start your diagnostic from TEST 1, do not skip around from test to test unless instructed to do so by the TEST you are currently on.
Most ignition coils are durable components, but they are neither indestructible nor designed to last forever. Ignition coils tend to fail because of bad spark plugs or plug wires. If your vehicle’s fuel-to-oxygen mixture is either rich or lean, therefore, your ignition coils may fail prematurely.
You need to use ohm meter to test the coil pack for continuity. Make sure you have the approximate ohm values for the coil pack. To find this information, research your car’s engine on the Internet or purchase a Chilton’s or Haynes manual to find out what the mega ohms reading on the coil pack should be. Coil Packs vs. Distributors