Category Archives: Diagnostics & Maintenance

Black Smoke From the Exhaust When Accelerating: Causes and Fixes

Black smoke from the exhaust when you accelerate generally means the engine is burning too much fuel for the air available, or that some fuel is not burning completely. It is a clue, not a diagnosis: the smoke alone cannot identify a failed part. Acceleration can make an existing problem more noticeable as the engine’s… Read More: Black Smoke From the Exhaust When Accelerating: Causes and Fixes »

Kia Telluride Won’t Start? Possible Causes and Checks

A Kia Telluride that will not start could have a battery, starter or starting-circuit, charging-system, or key-recognition issue, among other possibilities. However, the available evidence does not establish the most common cause or confirm a Telluride-wide fault. A symptom such as clicking is a clue to document, not a diagnosis. Start by noting exactly what… Read More: Kia Telluride Won’t Start? Possible Causes and Checks »

Mazda 3 P0455 Code: Meaning, Causes, and Whether You Can Drive

P0455 on a Mazda 3 means the vehicle’s computer has detected a large or gross leak in the evaporative-emissions (EVAP) system. The system captures fuel vapours and routes them towards the engine to be burned rather than allowing them to escape into the atmosphere. The code identifies a leak condition; it does not prove that… Read More: Mazda 3 P0455 Code: Meaning, Causes, and Whether You Can… »

How to Fix a Cylinder With No Compression

There is no responsible one-size-fits-all fix for a cylinder reported to have no compression. The repair depends on confirming the reading, identifying the fault on that particular engine, and matching the repair to the confirmed cause. The research available for this article does not verify a compression-test procedure, diagnostic limits, or a repair method, so… Read More: How to Fix a Cylinder With No Compression »

2015 Hyundai Elantra Overheating: Common Causes and What to Check

Common possible causes of a 2015 Hyundai Elantra overheating include low coolant from a leak, a radiator fan or airflow problem, a thermostat that does not open properly, a radiator issue, or a water-pump or other coolant-circulation problem. These are general cooling-system possibilities, not proof of a defect affecting every 2015 Elantra, and the available… Read More: 2015 Hyundai Elantra Overheating: Common Causes and What to Check »

Mercedes EGR Valve Symptoms: Warning Signs, Causes and What to Do

A faulty or sticking EGR valve can cause a Mercedes to idle roughly, lose power, hesitate or stall. Knocking sounds and a change in fuel economy may also occur. These symptoms can point to an EGR problem, but they do not confirm that the valve has failed: other engine-management or airflow faults can feel similar,… Read More: Mercedes EGR Valve Symptoms: Warning Signs, Causes and What to… »