Wont Start

Step 4 - Once the fuses have been inspected and any blown fuses replaced, the engine must receive fuel pressure from the fuel pump to be distributed into each cylinder of the engine. Using a fuel pressure gauge test system fuel pressure.

Testing Fuel Pressure

Step 5 - The ignition system of an automotive engine is used to ignite the fuel/air mixture inside the combustion chamber. If this system is not operational the engine will not run. Use a test light to check basic ignition system voltage output.

Testing Ignition System

Step 6 - The fuel injectors are used to disperse fuel into the engine cylinder via the computer operating system. If an injector short circuits it can stop the computer injector drivers from operating causing the engine not to start. Testing the fuel injector system is needed to determ if this problem is effecting the no start condition.

Fuel Injector Test

Step 7 - Spark plugs are used to ignite the compressed fuel air mixture inside the engine's cylinders. If the condition of the spark plugs are fouled by excessive fuel or carbon the engine may not start. Remove all spark plugs to inspect for a black soot which mean the plugs have shorted.

New Spark Plug

Step 8 - An engine needs cylinder compression to run properly. Remove any spark plug and perform a compression test on one or more cylinders to determine the malfunction direction.

Spark Plug Removal


Written by
Co-Founder and CEO of
35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


Please use our question form if you have a specific question about your car as we are not able to give you a full answer on this page.

Article first published (Updated 2014-10-24)