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The issue here sounds like it's the master cylinder failing. It is not retaining pressure when the engine is running. The reason they feel fine when the engine is not running is because the failing master cylinder is not getting power, and in essence is being bypassed.
It is the same as it is when you check the compression when the engine is not running. It does not change. It will only get worse as engine wears with time and as miles start adding up on the engine.
a strong engine should read between 150 and 180 pounds of pressure in each cylinder.
any gasoline engine will run on either natural gas or propane ( LPG )
If the engine is not running the pressure should be 35 to 40 psi. If the engine is running the pressure should be 30 to 45 psi.
1. Engine compression perform engine compression and cylinder difference test. 2. Fuel filter and fuel pump pressure verify the in tank booster pump is running and producing the correct pressure. Replace all fuel filters.
Key on Engine not running 55 - 61 psi. Engine running pressure should decrease 3-10 psi.
With key on engine not running pressure should be 9 to 13 psi Engine at idle pressure should decrease by 3 to 10 psi on a throttle body. On a multi port injection key on engine not running pressure should be 41 to 47 psi. Engine running at idle pressure should decrease 3 to 10 psi. Central multiport fuel injection key on not running should be 58 to 64 psi. Engine running at idle pressure should decrease 3 to 10 psi. Central sequential electronic fuel injection key on not running pressure should be 55 to 61 psi. Engine running at idle pressure should decrease 3 to 10 psi.
The fuel pump pressure may vary by vehicle. However, on average the fuel pump pressure with the engine running should be between 4-6 psig.
Yes. I have a 1995 4.6 litre crown Victoria that was originally fuel injected. It is now a propane only car and seems to be running fine.
For the operator to monitor the oil pressure of the engine. If the oil pressure drops below average when running, the engine is in trouble.
key on engine not running 58-64 psi engine running at idle pressure should drop by 3-10 psi