Rick's Free Auto Repair Advice

Posts Tagged: catalytic converter damage

Misfires – caused by alarm system

What causes a Misfire? Sometimes it’s your alarm system If you’re getting misfires and can’t find the source but have installed an aftermarket alarm  the alarm may be causing them. GM has determined that aftermarket alarm systems that use mechanical relays wired into the ignition system can generate actual ignition misfires that are serious enough to damage the catalytic converter. Mechanical relays have contact points mounted on a spring. Vehicle movement, pot holes, bumps, etc., can jolt the contacts enough to interrupt the ignition circuit for a few milliseconds. That’s … Read More


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