p0300 in 2003 sxt

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01N3ON
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Location: Knoxville, TN

p0300 in 2003 sxt

Post by 01N3ON » Thu Mar 15, 2012 12:21 am

okay guys...i have a 2003 neon sxt with about 141k miles on it. replaced the plugs and wires, but still have a multiple cylinder misfire. to my knowledge the coil pack has not been replaced. going to order a new coil pack that is oem quality from modern performance this weekend. just so i have a general idea of what to do if that doesnt work, what should i look for next? any sensors or anything like that going bad? it only throws codes p0300 and p0304. plugs are gapped correctly. is this a common issue with 2nd generations? anyone else have this problem and could shed some light?

thanks for your input!!!
2001 Dodge Neon SE Bomz Aluminum Spoiler, Black Housing Euro Tail Lights, Black Housing Halo Projector Headlights, Insys-USA Short Ram Intake. Coming soon: Underdrive Pulley, MSD Coil Pack, MSD Wires, NGK Plugs, complete engine rebuild (turbocharged of course)
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occasional demons
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Post by occasional demons » Thu Mar 15, 2012 7:34 am

Have you reset the PCM since changing plugs/wires?
Bill
Probably shouldn't listen to anything your penis says, that guy's a dick.
Patience, of course, is a very powerful weapon, but sometimes I start to regret that it is not a firearm.
Too much time spent here is a sign of a bad case of Ownaneonvirus.

2000 Neon MTX swap with '02 R/T PCM
1999 neon coupe 2.4 swap
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01N3ON
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Posts: 42
Joined: Mon May 04, 2009 9:30 pm
Location: Knoxville, TN

Post by 01N3ON » Thu Mar 15, 2012 11:36 am

The codes were erased but as far as resetting no. how do i reset it?
2001 Dodge Neon SE Bomz Aluminum Spoiler, Black Housing Euro Tail Lights, Black Housing Halo Projector Headlights, Insys-USA Short Ram Intake. Coming soon: Underdrive Pulley, MSD Coil Pack, MSD Wires, NGK Plugs, complete engine rebuild (turbocharged of course)
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occasional demons
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Location: Ashland Ohio

Post by occasional demons » Thu Mar 15, 2012 12:18 pm

Same difference.

Just checking to see if they were reoccurring or old codes.
Bill
Probably shouldn't listen to anything your penis says, that guy's a dick.
Patience, of course, is a very powerful weapon, but sometimes I start to regret that it is not a firearm.
Too much time spent here is a sign of a bad case of Ownaneonvirus.

2000 Neon MTX swap with '02 R/T PCM
1999 neon coupe 2.4 swap
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01N3ON
2GN Member
Posts: 42
Joined: Mon May 04, 2009 9:30 pm
Location: Knoxville, TN

Post by 01N3ON » Thu Mar 15, 2012 2:50 pm

The codes have been cleared but it is still misfiring and throwing the same codes. any idea of what to look for next?
2001 Dodge Neon SE Bomz Aluminum Spoiler, Black Housing Euro Tail Lights, Black Housing Halo Projector Headlights, Insys-USA Short Ram Intake. Coming soon: Underdrive Pulley, MSD Coil Pack, MSD Wires, NGK Plugs, complete engine rebuild (turbocharged of course)
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cook2790
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Location: Indianapolis, IN

Post by cook2790 » Thu Mar 15, 2012 4:20 pm

Get a spark tester, make sure it's spark that you're dealing with, it could be the injector if you've got spark, or maybe the tube or seal is bad on that cylinder. Did you notice any oil on the old spark plugs when you changed them?
-Cameron
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occasional demons
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Posts: 20064
Joined: Thu May 03, 2007 12:14 pm
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Post by occasional demons » Thu Mar 15, 2012 5:47 pm

Also intake gaskets/injector o rings.

Maybe a compression test, if all the above mentioned check out OK.
Bill
Probably shouldn't listen to anything your penis says, that guy's a dick.
Patience, of course, is a very powerful weapon, but sometimes I start to regret that it is not a firearm.
Too much time spent here is a sign of a bad case of Ownaneonvirus.

2000 Neon MTX swap with '02 R/T PCM
1999 neon coupe 2.4 swap
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Hudson_Neon
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Post by Hudson_Neon » Sat Mar 17, 2012 11:58 am

i had this exact same issue on my car for the longest time before i boosted it. if you have new plugs, wires, and coil... try swapping injectors around, clearing the codes, and trying it again. that will tell you if it's your injector. if it's still on cylinder 4, do a compression test. keep in mind that you could theoretically get semi-decent compression and still have a compression issue. i suggest you watch this...
http://www.youtube.com/watch?v=ofSiTGeLXvc
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