mozdzierz
New Member
- Joined
- November 21, 2015
- Messages
- 3
- Reaction score
- 0
- City, State
- Oxford, PA
- Year, Model & Trim Level
- 01 Ford Explorer XLT 4.0l
I've had my Explorer since it was new. I've to remove the heads, because an extractor broke off in the head, while trying to remove a rusted in exhaust manifold stud. After replacing the heads, the engine is experiencing misfires. The compression is good in all cylinders and spark is present. Based on my latest troubleshooting step, fuel pressure, I got a reading I don't know how to handle. So, I would like anyone's help. When I hooked up the fuel pressure gauge, it reads a steady pressure of about 65psi. My Haynes book states, that the pressure should be 30 to 45psi at idle, with vacuum hose attached to the fuel pressure regulator. It states that the pressure should be 40 to 50psi, with the regulator detached. It also states, that the fuel pressure should increase considerably, when the vacuum hose is removed. Well, like I stated before, the pressure is 65psi all the time, and when I remove the vacuum hose, the needle only jumps slightly and returns to 65psi. The engine misfires at around 4000 rpm, as when it does, the fuel pressure gauge needle jumps, as the engine misses. Since my knowledge of fuel injected systems is not as vast as I would hope, I'm asking any fellow 4.0l SOHC engine owner with more knowledge of the fuel system for help?