If the engine cranks — the starter spins it over — but it will not fire up, the starting system is fine. The problem is one of the three things an engine needs to run: spark, fuel, or compression. This guide works through them in order so you can find why your car cranks but […]
You do not need a scan tool to find which cylinder is misfiring. With the engine idling you can isolate the dead cylinder by briefly disabling one cylinder at a time and watching the idle. This guide shows the safe way to do it — by cutting fuel, not spark — plus how to confirm […]
The alternator keeps your battery charged and powers the car while the engine runs. When it fails you get warning signs — dim lights, a battery light, a dead battery, or odd electrical glitches. This guide lists the symptoms and shows how to confirm a bad alternator with a multimeter before you spend money replacing […]
A vacuum leak lets unmetered air into the engine, upsetting the fuel mixture. The usual symptoms are a high or rough idle, a lean code, and sometimes a hissing noise. This guide shows three ways to find the leak — listen, spray, and smoke — and how to confirm it with fuel-trim data. Symptoms of […]
An engine misfire means a cylinder is not burning its fuel-air mix properly, and a rough idle is the symptom you usually feel first. Misfires come from one of four areas — spark, fuel, air, or compression. This guide shows how to recognize a misfire, narrow it to the right area, and the common fixes. […]
You can test a car battery at home in a few minutes with a cheap multimeter — you do not need a shop. This guide covers the two tests that matter: a resting voltage check (state of charge) and a cranking check (whether the battery holds up under load), plus how to tell a bad […]
A flashing check engine light and a steady one mean very different things. A steady light is a stored fault you should check soon; a flashing light is a live, damaging problem you should stop for. This guide explains the difference, why a flashing light is urgent, and exactly what to do for each. Flashing […]
The check engine light means your car’s computer has stored a fault — but on its own it does not tell you how serious the problem is. The single most important clue is whether the light is steady or flashing. Use the table below to decide what to do right now, then read on for […]