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2004 Dodge Neon has fuel coming out of exhaust. Codes are 201, 203 and 300. Coil pack, plugs and wires all changed. Bad computer?

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  • mechanic144 Apr 15, 2017

    300 is random multiple misfire. could be injectors, yes. could also be a bad injector driver the part in the pcm that operates the injectors them selves. it could also be a faulty coolant temperature sensor. why? because if its reading, like its cold all the time, it will keep the fuel pumping to the engine, instead of limiting it as it warms up. allowing computer to adjust accordingly through other sensors. have that checked first. locate it. make sure all connectors are tight. plugged in (until you hear a physical click sound) and there's not bent pins. then you can check for abnormally high resistance through the sensor itself.

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  • Dodge Master
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On the fuel injector cylinder number 1 and cylinder number 3, use a noid lite on electrical connector, see if lite pulses when you crank it? If there is a pulse then voltage and ground hopefully is ok.
With everything off, you use a digital multimeter on the ohms setting, hook leads up on fuel injector itself, check the readings on all the fuel injectors, see if the reading is close on all injectors especially compared to injectors one and three.
You could swap suspected fuel injector to another cylinder, see if problem follows the fuel injector.
I don't know what testing you have done? I hate to tell you to replace this or that w/o more info?

Posted on Apr 15, 2017

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Posted on Jan 02, 2017

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Why does the coil pack keep goin bad on my 2004 dodge neon?


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Your EGR port is plugged. Replace your EGR valve, and clean the ports
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      • Running out of fuel
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  • Faulty oxygen sensor(s)
  • Faulty fuel injector
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  • Faulty catalytic converter(s)
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