Here are the 5 most common symptoms of faulty diesel fuel injectors.

White smoke occurs when diesel fuel isn’t reaching the temperatures required to burn, causing it to come through the exhaust intact. Clogged Fuel Filter. 2. Incorrect Injection Timing (due to a bad injector pump, worn timing gear, or a compromised crankshaft keyway)

Black smoke is the most common smoke color coming from a diesel engine and most likely indicates something is wrong during the combustion of the diesel fuel. The engine could be delivering too much fuel, not enough fuel, too much air or simply not enough air.

• Trouble starting the vehicle or uneven idling. The engine cranks but doesn’t start unless you crank it for a long time.
• Misfire.
• Smell of fuel.
• Dirty emissions.
• Increased fuel consumption and poor miles per gallon.

Comparison of best fuel injector cleaners

Extra Tips for Diesel Engine Cleaning Many people with diesel engines choose to use a degreaser on top of the regular cleaning. It’s best to use a water-soluble or citrus-based degreaser, but if you don’t want to hit the store, diluted dish detergent will work just fine.

1. Editor’s Pick: STA-BIL Diesel Fuel Stabilizer.
2. Howes Diesel Treat.
3. Power Service Diesel Kleen + Cetane Boost.
4. Stanadyne Diesel Performance Formula.
5. Ford Motorcraft Cetane Booster.
6. Power Service Diesel 911.
7. Star Brite Star Tron Gas Tank & Fuel System Cleaner.
8. Opti-Lube Ag Formula Diesel Fuel Additive.