Diagnosing Misfires
What if there are no codes and a misfire is intermittent? This is where it gets complicated.
GM Diagnostic Tip on Misfires, Noises and DTCs
Determine which description best matches the vehicle you are working on, and perform the suggestions as necessary.
Seasonal Fuel Blends And Misfires (VIDEO)
Here’s what happens when your fuel does not match the weather. This video is sponsored by Standard Motor Products.
How Belts, Tensioners And Misfires Are Connected
Modern crankshaft position sensors measure more than the position of the crankshaft.
VIDEO: Misfires In The Ignition System
It is so important to correctly diagnose misfires before repairs. This video is sponsored by Autolite.
VIDEO: Diagnosing Ignition Related Misfires
By performing these easy checks, you can determine if the spark plug wires are the problem or it is another component in the ignition system or on the engine. Sponsored by Blue Streak.
GM Tech Tip: Cold Start Misfires
An owner may complain of misfire or roughness during a cold start. Also, a P0300 code might be present, or there may be misfire codes limited to one or two cylinders. Looking at the misfire counter on a scan tool, you will see a high rate on typically one cylinder. The cause of the misfires might be a coolant leak that allows coolant to enter the cylinder at the point where the liner meets the deck face cast.
GDI System Maintenance: Preventing Misfires & Carbon Buildup On Intake Valves
Although GDI appeared in some post-World War II two-cycle engines and in some high-end performance engines, it didn’t come into its own for passenger car use until around 2008 when high-speed computing and piezoelectric fuel injectors turned GDI into a practical reality.
Misfires In The Crankshaft And Camshaft
Any time you’re dealing with a combustion engine, there’s a chance it will develop a misfire. A better understanding of how computer systems analyze a misfire can make your job that much easier as the service tech.
Installing Spark Plugs: Avoid Misfires
The potential for inadvertently creating a misfire is very real when installing new spark plugs. I say this because I’ve diagnosed many misfires created by greasy fingerprints, broken insulators and incorrect air gaps — all caused by poor installation procedures. But nothing is as simple as installing a spark plug, right? After all, a spark
