Engine Misses

Engine Misses at High Speeds:

• Bad fuel injectors or fuel injection pump.
• Bad fuel pump.
• Bad or poor fuel.
• Blocked fuel filter or air cleaner assembly.
• Blocked or damaged fuel lines.
• Blocked engine exhaust system.
• Sticking valves or broken valve springs.
• Incorrect valve adjustment.

Engine Misses at All Speeds:

• Bad fuel.
• Bad fuel injection pump.
• Bad fuel transfer pump.
• Dirty air cleaner assembly.
• Blocked or damaged fuel injectors.
• Blocked fuel filter.
• Blocked engine exhaust system.
• Engine brake exhaust valve stuck in a closed position.
• Worn camshaft lobes.
• Low cylinder compression pressures.

Engine Misses at Idle:

• Bad fuel.
• Bad injector or injection pump.
• Dirty air cleaner.
• Incorrect valve adjustment
• Blocked engine exhaust system or intake system.
• Leaking valve guide.
• Worn camshaft lobes.
• Low cylinder compression pressures.

Inconsistent Idle Speed:

• Incorrectly adjusted idle speed.
• Incorrect valve adjustment.
• Incorrect fuel injection timing.
• Blocked engine exhaust system.
• Burned, leaking or stuck valves.
• Worn or damaged camshaft lobes.
• Bad governor.

Engine Misses On One Cylinder:

• Bad or blocked fuel injector.
• Broken or bad pistons or piston rings.
• Bad valve spring.
• Stuck valve.

More helpful information can be found on our Blog and YouTube channel.

Injection Pump Failure Blogpost