Rick's Free Auto Repair Advice

Posts Tagged: misfire

Ford ignition coil problems

Fix Ford ignition coil problems Many shops are reporting a large number Ford ignition coil problems. The majority of the Ford ignition coil problems are directly related to customers WASHING their engines. Water can seep into the spark plug hole where engine heat turns it into steam and damages the coil. Here are some rules to prevent the problem: 1) Never wash the engine unless you cover the coils 2) Always replace spark plug boots when you change plugs. 3) Always replace the spark plug when you replace a coil … Read More

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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