Question about 2004 Dodge Neon

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Weak Spark on #1 Cylinder

You responded to my problem with a question. I have included the answer to your question below. My initial problem - My Dodge Neon has been running rough and the check engine light comes on occasionally and then goes off on its own. I had a diagnostic run on it and the mechanic found that there was a misfire in cylinder #1. The injectors, and plug wire checked good but he found that the spark on cylinder #1 was weak (less than half of the intensity of the other three). The other three were strong and looked good. He suggested to replace the ignition coil, which i did but it did not help. What else would be causing this weak spark condition. Your response - Did you try swapping plugs & wire with another good cylinder. Maybe bad plug or wire, even though check says wire good. My Answer - Yes, the wires were swapped and it was still getting a weak spark on Cylinder 1 using the same plug to test all cylinders. I am going to swap out the crankshaft position sensor tomorrow. Do you have any other ideas if that does not work?

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  • 2 more comments 
  • tmoz Jan 25, 2009

    Yes, that is exactly what it does, except when at highway speeds if I need to accelerate for a hill or increase in speed limit, it misses then as well.

  • tmoz Jan 27, 2009

    I got it fixed. I do not know which it was but this was the order of progression. As i mentioned, I originally changed out the Ignition coil. It did fix the spark issue for cylinder #1. Still was running rough though. I swapped out the crankshaft position sensor and the situation got better but still not fixed. As I was looking for a possible vacuum leak, I grazed across a plug wire and got a light shock. Replaced the plug wires and viola. The problem could have been one, two or all of the things I changed out, I don't know. I'm not going to put the originals back in to find out though. Thanks for your help. By the way, I looked for the EGR valve and couldn't locate it. I did some further reading on other sites and found out that the newer Neons do not have one.

  • Mike Butler
    Mike Butler May 11, 2010

    Does it have this miss only at idle & then seem to straighten out when running at highway speeds?

  • Mike Butler
    Mike Butler May 11, 2010

    I'll keep digging. Odd !

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  • Dodge Master
  • 6,674 Answers

I'm getting real suspicious of EGR valve fault. For now, pull vacuum line off valve, and see if there is vacuum at idle, plus see if engine straightens out, when line off, idle wise.

Posted on Jan 25, 2009

  • Mike Butler
    Mike Butler Jan 25, 2009

    I'd pull that EGR valve off & inspect it & the port for carbon build up too, and clean as necessary & retry if it were me. Grab yourself a spray can of combustion chamber cleaner, and a new EGR gasket. Be sure to read spray can warnings, that stuff is pretty potent. Take valve with you to parts store & ask if they can test vacuum side of it with vacuum hand pump while your there.

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Did you try swapping plugs & wire with another good cylinder. Maybe bad plug or wire, even though check says wire good.

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