Spark Plug Gap Chart: Proper Gaps for Every Make & Model

Spark Plug Gap Chart: Proper Gaps for Every Make & Model

Spark plug gap is a critical ignition specification that controls combustion efficiency by regulating the distance an electrical arc jumps across plug electrodes, ensuring proper flame kernel growth, fuel burn stability, and long-term engine reliability. In 15 years of dealership and independent shop work, over 70% of misfires diagnosed on OBD-II vehicles traced back to … Read more

Bad Fuel Injector Symptoms: 9 Signs You Need Cleaning

Bad Fuel Injector Symptoms: 9 Signs You Need Cleaning

It was a Tuesday morning, about 20 degrees outside, when Sarah rolled her 2016 Honda Civic into my bay with that unmistakable stumbling idle. She’d been dealing with it for three weeks, and now the check engine light had finally joined the party. “It feels like the car’s about to stall every time I stop … Read more

Compression Test: How to Check Engine Health

Compression Test: How to Check Engine Health

Quick Answer: An engine compression test measures the pressure in each cylinder to diagnose issues like worn piston rings, leaking valves, or a blown head gasket. A healthy engine should have compression between 125-175 PSI per cylinder, with no more than 10% variation between cylinders. The Day I Diagnosed a “Dead” Engine with a $40 … Read more

How to Fix Rough Idle at Startup: A Master Technician’s Step-by-Step Guide

How to Fix Rough Idle at Startup

If your car shudders, bucks, or threatens to stall the moment you turn the key—especially on a chilly morning—you’re dealing with a rough idle at startup. It’s one of the most common yet frustrating issues drivers face. Left unaddressed, it can lead to poor fuel economy, failed emissions tests, or even engine damage over time. … Read more