Low fuel pressure? How do I check it?

It sounds like a fuel related problem. The regulator is on the fuel rail. I recommend checking the fuel pressure to see how much there is.

Here is a how to for checking.

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

Let me know what you find.

Joe

56 to 62 PSI... Below 56 is where you will start having problems. Also, make sure there isn't a problem with the regulator. Here is a how to video that explains how to check it. I hope it helps.

https://www.2carpros.com/dia/test_fuel_pressure.htm

Let me know if you have other questions.

Joe

Okay, there is no key on engine off specs but it should build up enough pressure to start. Yes the fuel pump will only run for about three seconds with the key on engine off but it should run all the time with engine running. With that the fuel pressure should be 60-66 psi and needs to have full pressure to start. With you problems I must ask how old is the fuel filter?

Okay, the fuel pressure is low when it is running. So check the vacuum line going to the pressure regulator make sure it is good. If all that is good then unplug the pressure regulator and see what the pressure does. It really needs to be in that 60-66 psi range. Get back to me with what you find.

Yes, it is under the upper plenum and it does not have a vacuum line to it as it is set by spring pressure internally. So if the fuel pressure is low this is more then likely the problem. Also, these injection systems like to crack the fuel lines that connect to the injector unit and leak. So I would replace the regulator and check those lines for any signs of leaking there is a repair kit for them at most parts stores if it does look like it cracked. With out the fuel pressure up to full pressure there is not much more we can do for tests as this will affect them. Let me know what you do and how it goes.

Check the knock sensor. Make sure it is plugged in and working.

Dpierce.

The cam retard at -17 is not good. The dealer change the position of the distributor to get the 0 reading that the cam sensor requires.

Doing that s compensation for a worn timing chain. That is why you have pinging. Most likely you will need to replace a worn timing chain and then have the cam retard reset.

Roy