What should I do if my diesel injector is not working?
With something to catch any fuel, try each injector in turn releasing the fuel pipe nut ½ a turn. If the engine note changes then the injector is at least doing something. If there is no change then the cylinder isn’t firing – if compression is ok then the injector is likely to be faulty.
How do you do a compression test on an engine?
Move the compression gauge to repeat the test on the other cylinders. Unscrew the hose adapter by hand, then move it onto the second cylinder. Keep doing it until you have a result for all of the engine’s cylinders. Be sure to record each number on a piece of paper so you can compare them when you’re done.
Do you have to take spark plugs out to do compression test?
The spark plug wires are generally well-routed to avoid confusion, but keep them separate anyway to reduce the possibility of switching them. You don’t need to take the wires out to perform the test, but consider taking the opportunity to inspect them and replace worn-out ones.
Can a faulty injector be used in an inline pump engine?
These tests assume a rotary injection pump is used. If the engine has an inline pump then injector pump problems could give the same effect as a faulty injector. If a test pump is available then that is much more informative, but this procedure will allow some testing without special equipment. Assuming the engine will run:
How do you do a compression test on a diesel engine?
On a diesel engine, you’ll need to disconnect either the injectors or the glow plugs to connect the compression gauge into, depending on your particular engine. Consult your vehicle service manual, if necessary. Also, you’ll need to use a heat shield for the gauge, if you need to connect to an injector port. 12.
Do you need to remove spark plugs for engine compression test?
WARNING: You’ll need to remove the spark plugs while the engine is warmed for this test. If a spark plug seems too hard to remove, DON’T FORCE IT LOOSE. This may deform the mounting plug threads on an aluminum cylinder head.
Which is the best way to test a fuel injector?
Check your repair manual for further tests, if necessary. You can also test the injector controlling circuit using a noid light. This is the easiest way to test an injector feeding circuit. The noid light connects to the harness of the fuel injector you want to test. You can loan or buy a set of noid lights from your local auto parts store.
Can a clogged fuel injector be repaired quickly?
Clogged injectors can usually be repaired, if you catch the problem quickly. Sometimes a fuel injector is completely clogged, because of years of neglect or a lack of regular engine servicing. If this is the case then a refurbished replacement, may be the only option.