Why Does My Car Idle Rough When AC Is On?

Why Does My Car Idle Rough When AC Is On?

  Last Tuesday, 3:47 PM—heat index 104°F—a sweating guy in a 2016 Honda Civic LX rolled into my shop looking like he’d seen a ghost. “It’s doing this every time I hit the AC,” he said, mimicking violent shaking. His knuckles were white on the steering wheel. I popped the hood and saw it immediately: … Read more

Vacuum Leak Diagnosis: Finding and Fixing Leaks

Vacuum Leak Diagnosis: Finding and Fixing Leaks

It was 3:47 PM on a sweltering Tuesday in July when Mrs. Henderson’s 2012 Toyota Camry rolled into my bay. “It’s making this weird hissing sound, and the idle keeps dropping so low I think it’s going to stall,” she said, wiping sweat from her brow. I’ve heard this story hundreds of times, and my … Read more

Rattling Noise from Engine: What’s Wrong?

Rattling Noise from Engine: What's Wrong?

Quick Answer: An engine rattling noise is usually caused by a loose component (like a heat shield or accessory bracket), an exhaust rattle, low or incorrect engine oil, or internal issues such as timing chain rattle. The key is identifying when the noise happens—cold start, acceleration, idle, or deceleration—because each points to a different failure. … Read more

Ticking Noise from Engine: Common Causes

Ticking Noise from Engine: Common Causes

Quick Answer: That ticking sound? 8 times out of 10 it’s hydraulic lifters needing oil flow or fuel injectors doing their normal business. But if it’s loud, irregular, or changes with engine speed—especially after an oil change—check lifter noise first. Exhaust leaks and timing chain issues are serious but less common. Diagnose properly before spending money! … Read more

Engine Knocking Noise: What It Means and How to Fix It

Engine Knocking Noise: What It Means and How to Fix It

Quick Answer Engine knocking noise is a metallic pinging or rattling sound caused by abnormal combustion (detonation) or worn mechanical parts. Common fixes: use higher-octane fuel, clean carbon buildup, replace spark plugs, or repair bottom-end bearings. DIY cost: $20–$400. Shop cost: $200–$3,500. Tuesday, 7:15 a.m., 38 °F in the shop—my coffee hadn’t even cooled when … Read more

Cylinder Misfire: Causes and Solutions

Cylinder Misfire: Causes and Solutions

By ASE-Certified Master Automotive Technician A Rainy Tuesday Misfire Mystery It was 7:45 AM on a rainy Tuesday when Sarah pulled into my shop in her 2016 Honda Civic, the check engine light blinking like a frantic strobe light. “It’s shaking like crazy,” she said, her voice filled with concern. “I’m afraid to drive it … Read more

Engine Misfire Symptoms: What to Look For

Engine Misfire Symptoms: What to Look For

If you’ve ever felt your car shudder, lose power unexpectedly, or idle like it’s about to stall, you may be dealing with a classic—and potentially serious—automotive issue: an engine misfire. As an ASE-certified master technician with over 15 years of hands-on experience diagnosing everything from weekend project cars to daily commuters, I’ve seen misfires cause … Read more

What Does a Flashing Check Engine Light Mean?

What Does a Flashing Check Engine Light Mean?

  Quick Answer: A flashing check engine light means your engine is actively misfiring and dumping raw fuel into the exhaust. This can overheat and destroy the catalytic converter in minutes. Slow down immediately, avoid hard acceleration, and diagnose the issue—or shut the engine off and tow it. The Night a Flashing Light Saved a … Read more