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97 jeep wrangler 4.0 L will not start , power to all , fuel ok , but the fuel gauge and the batery gauge will not move when turn key on , engine will turn over but not start, checked all fuses and relays seem ok whot could be the problem? Jeep was running wife put it in park left it running and the jeep just stoped running?
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I would suspect the ignition switch (electrical) is the problem due to the age of your Jeep. Sometimes when you turn the ignition key if it's really bad, you will feel a bit of roughness indicating the switch is breaking apart inside.
Turn the key from off to on repeatedly and see if you notice if the fuel & volt gauges work each time.
If you find it's not the switch, you'll need to check your wiring ground locations to make sure they are not rusted and are making good electrical contact. Specifically, a ground wire to the dash panel.
If all grounds are in excellent condition then you may need to trace the wiring from the battery to the ign. switch to the gauges to see if you can find any damaged loose or pinched wiring. A good 12 volt test light should help you to isolate and find this issue, start at the battery and work your way through:)
FLEX your wiring a bit and make sure it's still flexible. Sometimes your wiring can become so corroded over time that current barely makes it to the destination.
Key on engine off , what is the fuel pressure ? When you turn the key to the on position ( not start ) the PCM will turn the fuel pump on for two or three seconds for system prim , then it needs a RPM signal (engine cranking) . In side the fuel pump module is a check valve that keeps pressure in the fuel lines , if weak will allow fuel to drain back to the fuel tank . This will cause long crank times . Put a fuel pressure gauge on the vehicle an see what the pressure is key on , does it come up to 40 psi ?
Fuel flow. Either simply, a blocked fuel line (debris / filter / fouled gas) or an electronic issue. Ever let this Jeep run bone dry on gas? Hopefully not, as doing so can draw a lot of crud into your fuel lines from the bottom of the tank. Electronically, if part of the Jeep "brain" has gone bad, there may not be any fuel being routed to the engine. This most likely needs a Jeep mechanic to repair.
1. Connect fuel pressue gauge, start engine
2. Observe test gauge. Normal operating pressure should be 339kPa+/- 34 kPa (49.2 psi +/- 5 psi
3. Turn vehicle off.
4. Pressure should not fall below 30 psi for 5 minutes
i have these directions plus more about if want in pdf format, need email address to send if want
Disconnect and replace fuel filter.With filter disconnected have someone momentarily turn key to on position to see is fuel pump is working.Make sure you have lots of rags,a drain pan and safety goggles on
Wire on oil sending unit may have fallen off or sensor itself may have gone bad. Check both. If engine has no tapping noises, likely it's not a pressure problem.
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