Went out today to do some shopping, ran fine....come out of one store, started up and was running rough, no response to throttle...engine died. Waited about 5-10 min, jiggled wires at the coil, IAC, distrib, etc...started up and got us across the street to the next store...kept it running while daughter went in store...died again, restarted fine, held it at about 2k RPM, died again and wouldnt restart. Got it towed home....all thoughts welcome...
Has fuel on the rail...
HT1 (SW/AW) USN RETIRED (HT-4946)
24 Jun 81-30 Jun 01
ASNT NDT Level III (VT, MT, PT)
[COLOR="DarkRed"]02 WJ-4.7 My DD[/COLOR] [04 WJ-4.0, 00 XJ-4.0 Gone]
[COLOR="SandyBrown"]03 WJ-4.0 Dau #1 DD[/COLOR]
93 ZJ-5.2 Dau #2 DD
There was also a TSB really early on (1994, I think), concerning the effects of heat on the coil. If there is a crack, especially, it will start acting funny when hot. See if it runs any better when it's cold.
1994 ZJ, 5.2L/46RH, NP242 & D44HD Swap, 4" SA Lift, 31" KM2s, and all the usual... I only lifted it so I wouldn't have to drive my grandma to church anymore... ;)
Remember: Every time you call a Jeep a "car", God kills a kitten.
This comes from the 1998 Jeep ZJ manual, specifically a ZJ with a 5.2 engine. It should be the same for your vehicle and engine.
FUEL PUMP PRESSURE TEST WITH PRESSURE TEST PORT
Check Valve Operation: The electric fuel pump outlet contains a one-way check valve to prevent fuel flow back into the tank and to maintain fuel supply line pressure (engine warm) when pump is not operational. It is also used to keep the fuel supply line full of gasoline when pump is not operational. After the vehicle has cooled down, fuel pressure may drop to 0 psi (cold fluid contracts), but liquid gasoline will remain in fuel supply line between the check valve and fuel injectors. Fuel pressure that has dropped to 0 psi on a cooled down vehicle (engine off) is a normal condition. When the electric fuel pump is activated, fuel pressure should immediately rise to specification.
NOTE: The fuel pressure test port is used on certain engines only. The test port will be located on the fuel rail near the throttle position sensor. A sealing cap is screwed onto the test port.
All fuel systems are equipped with a fuel tank module mounted, combination fuel filter/fuel pressure regulator. The fuel pressure regulator is not controlled by engine vacuum.
WARNING: The fuel system is under constant fuel pressure even with the engine off. Before disconnecting fuel line at fuel rail, this pressure must be released. Refer to the fuel system pressure release procedure.
1. Remove the protective cap at the fuel rail test port. Connect the (0-60 psi) fuel pressure gauge to the test port pressure fitting on the fuel rail.
2. Start and warm the engine and note pressure gauge reading. Fuel pressure should be (49 psi +/- 5 psi) at idle.
3. If engine runs but pressure is below 44 psi , check for a kinked fuel supply line somewhere between fuel rail and fuel pump module. If line is not kinked, replace fuel pump module assembly.
4. If operating pressure is above 54 psi , electric fuel pump is OK, but fuel pressure regulator is defective. Replace fuel filter/fuel pressure regulator.
In my neck of the woods, the fuel pump module costs around $300 at Jeep. It includes the fuel pump, the fuel sender and the fuel pump regulator. It is simple to do, the biggest thing is dropping your tank. I hope this helps.
Check out "YJ V6 Conversion" if you want to see a frame up restoration of my 1992 YJ.
Check out "WWII Jeep Photos AND Restoration of..." if you want to see the original JEEP in action...