My 2004 TJ Sport has trouble starting when cold. It cranks a couple of times before turning over. The slow start can be avoided if I the key to ON a couple of times before I try to start.
After running for a bit, if i don't let it sit for too long, it starts up quick, no problems. It was throwing an engine light and a P0301 code.
Per previous research and advice, I just replaced the entire fuel pump assembly module (which I'm told includes the fuel pressure regulator, which would keep the fuel from draining back to the tank causing the slow start). then disconnected the battery for a bit to reset the code.
The jeep's running smoother (so there was probably a fuel pump problem too), but the slow start issue remains.
Anyone have an idea on what it could be? O2 sensor? the fuel pressure regulator on the fuel rod? spark plugs? Fuel injectors?
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Since you were getting the P0301 (misfire #1 cylinder), code you may well have the #1 injector leaking down & causing the hard start. The other thing is are you sure the fp module (including the regulator) was replaced? If so then I'd bet it's the injector.
The factory tool for checking the pump pressure involves opening the line going to the rail & a hose with a "T" fitting for a gauge going between the line & rail.