What will cause a diesel engine to run rough and stall?
The EGR Valve (Exhaust Gas Recirculation Valve) is an emission control device that allows exhaust gas to enter the intake manifold. These started becoming common on both gas and diesel engines sometime in the 1970s. This causes it to stick open, causing a rough idle or engine stall.
What causes a rough idle in a diesel?
Diesel injectors operate at much higher pressures than gasoline injectors. Dirty injectors will lean out the air/fuel mixture, causing a loss of power, rough idle and sometimes white smoke in the exhaust. Leaky injectors will richen the air/fuel mixture and cause black smoke.
Why is there black smoke coming out of my exhaust?
Black smoke being produced from the exhaust system of is a sign of too much fuel being processed by the engine. A correct fuel and air ratio must be maintained for optimum performance, economy and emission requirements.
What to do if your engine has black smoke coming from the tailpipe?
By removing each cylinder spark plug and checking their condition (black or wet with fuel) you can identify the afflicted cylinders. Once completed remove the injector (s) for a physical and ohms test across the coil. Remove the EGR to check valve operation. When this valve is not in operation it should remain closed.
What causes a car engine to stop running at idle?
Excess carbon build up can cause the EGR valve to stick open allowing intake pressures to drop and the engine to stall at idle and run rough. Burning to much fuel will cause the spark plug to carbon foul causing the engine to stop running. Once the issue has been rectified the old spark plugs must be removed and new ones installed.
What causes black smoke in the combustion chamber?
Piston Rings are designed to prevent the infiltration of engine oil inside the combustion chamber. If there is any problem with the piston rings, the engine oil starts flowing into the combustion chamber. The combustion of the mixture of this engine oil and the fuel delivers black smoke. 6. Engine Deposits