Frequent question: What would cause a diesel engine to surge?

Can dirty fuel injectors cause surging?

Surging Engine

If you feel your engine surging, your car may be suffering from clogged or dirty fuel injectors. This can cause the engine to surge too fast and then accelerate too slowly. To the driver, this condition will feel like an up and down motion.

What causes a Kohler engine to surge?

surging on a governed engine is always due to an fuel;air ratio that is too low. The fuel supply to the main jet is not enough. You test for the first by starting the engine and saturating the area between the carb & the engine with WD 40 or similar from a trigger pack, not a spray can.

What causes a small engine to rev up and down?

A lawnmower that hunts and surges may be experiencing something as simple as an airflow issue. If the air that the engine requires to run is blocked, especially sporadically, it can cause the engine to slow down. When the blockage moves or clears, the engine may suddenly rev up in response.

What are the symptoms of a bad fuel filter?

What Are the Signs of a Clogged Fuel Filter?

  • Poor Engine Performance. Under heavy or high-speed acceleration, a clogged fuel filter may cause the engine to randomly hesitate, surge or sputter. …
  • Hard Starting. …
  • Stalling. …
  • Random Misfire or Rough Idle. …
  • Fuel System Part Failures. …
  • Check Engine Light (CEL)
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Is a surging engine bad?

Engine Surging Can Be an Early Warning Sign of Ignition Problems. Engine surging is usually a warning sign that your car or truck is having combustion problems. Since a vehicle’s ignition wires and spark plugs play a major role in proper engine performance, it is likely time to check your engine’s electrical components …

Can a vacuum leak cause surging?

Vacuum leaks can cause surging on some engines, but it depends on the type of fuel injection system. … Vacuum leaks in MAF systems will usually cause a rough idle, but often will not result in surging under cruise.

Can a failing fuel pump cause surging?

Engine Surging

A failing fuel pump may cause vehicle surging and shows you have to replace the fuel pump.