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engine runs rough after a bit of driving...HELP!


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okay on my 95 neon its got the 2.0 with an auto tranny.

after I drive a bit like today I drove ~35 miles with no problem. shut it off and let it sit for about 20 minutes then drove it back home. same distance. and when I got about 2 blocks from the house she started running rough off the stop. she kinda spit and sputtered got up to speed and it still ran sorta rough but it still drove.

now I thought it was an over heat problem so I checked the fans. they weren't coming on so I checked the relay and the temp sensor. I replaced them both. other wise I would have had this trouble on my way to work. I'm going to do a radiator flush on it just to make sure the heat transfer is proper. but I'm wondering if it may not be something else.

HELP!

<img src=http://i1332.photobucket.com/albums/w610/beastly666bassboy/IMG_9611192581855_zps9b9b76be.jpg border=0 alt= height="75" width="800">

Growing old is necessary... growing up is an option! Have fun or you might as well fall into a 6 foot deep hole. Its much easier to be smart and act stupid then it is to be stupid and act smart! You're only limited by your imagination! Stop limiting yourself! Optima yellow top6 guage cableJVC KD S36 headunitPower acoustik 1600w 750w rms @2 ohmsTwo MTX thunder 7000 10"sSealed box @4.04 ft^3Mojo Mat in the trunk Coming soon:1/0 awg cablebig 3... in 6 gauge(till i can get the money for 0)planet audio Crossover.2- 3.5's for the front.2- 6.5's for the doors2- 6x9's for the rear3- MB Quartz amps to power it all.1- 6" aeroport...soon! <p>My Log!

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Over heating wont cause that

Vapor lock, is possible Next time it happens loosen your gas cap and see if it goes away

Plugged fuel filter also

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ahhh that would make sense... I don't have vent tube for my gas fill neck hmm ill have to try that...

AIRBORNE: explain the trick... I wanna know! hahaha... it may come in handy...

thanks guys :) very helpful ill definitely see what's up :)

<img src=http://i1332.photobucket.com/albums/w610/beastly666bassboy/IMG_9611192581855_zps9b9b76be.jpg border=0 alt= height="75" width="800">

Growing old is necessary... growing up is an option! Have fun or you might as well fall into a 6 foot deep hole. Its much easier to be smart and act stupid then it is to be stupid and act smart! You're only limited by your imagination! Stop limiting yourself! Optima yellow top6 guage cableJVC KD S36 headunitPower acoustik 1600w 750w rms @2 ohmsTwo MTX thunder 7000 10"sSealed box @4.04 ft^3Mojo Mat in the trunk Coming soon:1/0 awg cablebig 3... in 6 gauge(till i can get the money for 0)planet audio Crossover.2- 3.5's for the front.2- 6.5's for the doors2- 6x9's for the rear3- MB Quartz amps to power it all.1- 6" aeroport...soon! <p>My Log!

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Do the keycode dance and get your codes to find out where the problem lies, Turn your ignition on and off 3 times quickly and leave it in the on position and watch your engine light to see what codes it gives you, then go to neons.org and look up those codes to see what needs fixing or replacing. My car would run rough at times and normal at other times till i replaced the map sensor.

EDIT: http://forums.neons.org/viewtopic.php?f=125&t=281606

01 Ford focus ZX3

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PPI PC 4800.2

Morel Maximo 6.5" x2

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Do the keycode dance and get your codes to find out where the problem lies, Turn your ignition on and off 3 times quickly and leave it in the on position and watch your engine light to see what codes it gives you, then go to neons.org and look up those codes to see what needs fixing or replacing. My car would run rough at times and normal at other times till i replaced the map sensor.

EDIT: http://forums.neons.org/viewtopic.php?f=125&t=281606

hmmm actually I can one up you on that one... last time I did the keydance it said my 02 sensor I replaced the front ine already the rear one may be bad yet... now I'm not sure now but now my dad has just gotten an obd1 and obd2 reader so I'm hooking that up tonight and check it... :D thanks for the input... I love that neons.org... I've learned a bit from them... they are good stuff :D

<img src=http://i1332.photobucket.com/albums/w610/beastly666bassboy/IMG_9611192581855_zps9b9b76be.jpg border=0 alt= height="75" width="800">

Growing old is necessary... growing up is an option! Have fun or you might as well fall into a 6 foot deep hole. Its much easier to be smart and act stupid then it is to be stupid and act smart! You're only limited by your imagination! Stop limiting yourself! Optima yellow top6 guage cableJVC KD S36 headunitPower acoustik 1600w 750w rms @2 ohmsTwo MTX thunder 7000 10"sSealed box @4.04 ft^3Mojo Mat in the trunk Coming soon:1/0 awg cablebig 3... in 6 gauge(till i can get the money for 0)planet audio Crossover.2- 3.5's for the front.2- 6.5's for the doors2- 6x9's for the rear3- MB Quartz amps to power it all.1- 6" aeroport...soon! <p>My Log!

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