fuel injector problems

Black Smoke from Exhaust: Common Causes

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Black Smoke from Exhaust: Common Causes

Quick Answer: Black smoke from your exhaust usually means your engine is running “rich”—burning too much fuel or not enough air. Common culprits include a leaking fuel injector, a clogged air filter, a bad sensor (MAF or O2), or a stuck open fuel pressure regulator. The $3,000 Mistake: A Shop Floor Story It was a Tuesday … Read more

Fuel System Problems Causing Poor Performance: A Master Technician’s Guide to Diagnosis and Repair

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Fuel System Problems Causing Poor Performance

By Hank Riggs, ASE Certified Master Technician (L1 Advanced Engine Performance Specialist) 15+ Years Turning Wrenches, Diagnosing Drives, and Solving the Toughest Automotive Mysteries When your car’s engine stumbles, hesitates, or flat-out refuses to pull like it used to, your gut might scream “transmission trouble” or “ignition coil failure.” And sure, those can be culprits. … Read more