These single channel ignition testers allow you to check the entire ignition system while it is in the car. Once the ignition tests good, you can continue troubleshooting and find the issue. They produce a simulated trigger signal that fires the ignition just as if the engine were running. If the spark is weak at the plug, there is an ignition problem and you can trace it down. The testers operate on 4, 6, or 8 cylinder engines and will simulate up to 10,000 rpm.
