Rick's Free Auto Repair Advice

Posts Tagged: Ignition Coil

Ignition Coil

Ignition Coil — What is it and how does it work? An ignition coil provides a high voltage pulse which creates the energy for a spark to jump the spark plug gap and initiate the combustion process in the cylinder. The ignition coil has three components; primary winding, secondary winding, and an iron core. These components work together to convert 12-volt DC power in 25,000 to 40,000 volts DC. Primary windings and the iron core The primary winding consists of hundreds of wraps of a thicker gauge wire that is … Read More

Diagnose ignition coil failure

What is a coil-on-plug ignition coil? Most late model engines use coil-on-plug (COP) ignition coils. COP ignition coil provide higher voltage than coil packs because they operate with longer dwell time. In other words, they have more time to build a magnetic field, so it produces a higher voltage spark when it collapses. Car makers need that hotter/longer spark to ignite leaner fuel mixtures in modern engines. The COP units are most commonly installed directly over each spark plug, sometimes sitting deep in the cylinder head. That placement eliminates the … Read More

Is it the ignition coil?

Is a bad ignition coil causing your misfire or no-start condition? An ignition coil failure can be permanent, causing a no spark no start condition or it can intermittent, causing a cylinder-specific misfire condition or a random misfire. The trouble code for a random misfire condition is a P0300 and a cylinder specific misfire trouble code is P030X, with the X corresponding to the cylinder number. Ignition coils are made in various configurations like: single can coil, coil pack and coil-on-plug (COP). But they all operate on the same principle. … Read More

P0351 – P0362

Fix code P0351 – P0362 Ignition Coil A-L Primary , Secondary Circuit Malfunction If you have a P0351 – P0362 Ignition Coil A-L Primary , Secondary Circuit Malfunction trouble code, read this to understand what it means Each ignition coil is built with two bobbins of wire. The primary coil has fewer windings than the secondary coil. The primary coil induces an electrical field into the secondary coil. When the primary current is shut off, the electrical field collapses. Because the secondary has so many more windings, it converts the … Read More


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