Question about 1997 Plymouth Neon

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1997 Neon dies, starts after electric fuel pump relay swapped

My 1997 Plymouth Neon runs fine for 5 minutes, then dies. There's no warning; tach drops to zero & I'm DOA. Accessory lights, everything works; engine cranks but no start. Replaced electric fuel pump relay, fuel filter, & ignition module (coil). Here's the kicker, after the car dies the 1st time, if I switch the electric fuel pump relay with another one, the car starts right up! Then runs ok for another short time until it dies again. Once this happens, the car's got to sit for an hour before it'll start again. With the warmer weather, car's running ok for a continually shorter amount of time.
Fuel pressure checked & looks ok, computer check revealed nothing.Battery's charged & wiring visibly looks ok.

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  • martyc766 May 20, 2009

    I get no computer problem codes, either before or after the neon dies.

  • martyc766 May 20, 2009

    That I haven't checked while the car was in the DOA state.

  • martyc766 May 21, 2009

    The fuel pressure checked out fine even after the car dies. Spark plugs were clean & spark plug wires tested ok. All fuses inside the car & under the hood were good. The wiring under the PCM module looked good & intact. Like clockwork, the car dies in 5 minutes either moving or idling.

  • Jeff Hammack
    Jeff Hammack May 11, 2010

    ok the plug wires tested ok but do they spark the plug when the engine has died? let he engine die and put a plug in one of the wires and lay it next to the valve cover, have someone crank the engine and watch the plug does it spark? All engines need air, fuel, and spark to run, your engine runs so air is probably ok, fuel pressure is present even when it dies, so fuel may be ok, spark works at first but what about when is dies? When we determine which one of these three goes away, then we can repair it.

  • Jeff Hammack
    Jeff Hammack May 11, 2010

    start it and let it die then try to restart and check both spark and fuel pressure, which one do you have or have not?

  • Jeff Hammack
    Jeff Hammack May 11, 2010

    have you watched the fuel pressure as the engine dies? what is the pressure during the no start period?

  • yadayada
    yadayada May 11, 2010

    what electronic trouble codes do u have,

  • Anonymous Mar 15, 2014

    I have changed fuel pump 2 times, new fuel filter, new coil, new plugs, wires, distributer, rotor and it still does it.



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Hello, I would assume this is your fuel pump inside your tank. I would first however do some basics like a general tuneup. For starters I would replace your spark plugs and wires, rotary cap and button and check your fuses. Run some injector cleaner through your system. You know quick simple cheap things before you get to the fuel pump inside the gas tank which can be kinda expensive. The warm up then dies can be caused by, "blownout or fouled," spark plugs. I hope this gives you a general direction in which to go. A sidenote is that coil packs do not normally run an igntion code and I for one do not like them becuase they are expensive.

Posted on May 20, 2009

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This sounds like your fuel pump is going bad. Make sure your fuel injectors are clogged.

Posted on May 19, 2016


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