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Forums Nissan Models Sentra 2001 Sentra, #3 cylinder not firing
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Old 08-17-2010, 05:08 PM
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Default 2001 Sentra, #3 cylinder not firing

Need some advice. #3 cylinder is not firing, new coil, new plug. Voltages at coil are as follows: 13.X Volts for +, ground is good, and other wire is at.8 to1 volt. The other cylinders are the same for the +, but that third wire has a voltage of .19 to .2 volts. I have unwrapped the harness all the way to the ECM looking for a worn spot or a short, found nothing. ECM shot?

Short history: 1 coil replaced 2 weeks ago on #2 cyl. , ran fine for 3-4 days, then acted like the T.P.S. was going(skipping at 1/2 throttle and above), that cleared up next day, then 2 days later started skipping on #3(all the time). Replaced coil, plug, no better.

Don't think it's my head gasket as i have no antifreeze loss, ever, and plugs look fine. #3 plug is wet when i pull it, but it smells of fuel, not antifreeze, and it's not white from water. Also, no codes as of yet, but i quit driving it for fear of ruining my new $400 CAT.
Looking for ideas!!

Last edited by prhoades2; 08-19-2010 at 03:16 PM. Reason: voltages
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Old 08-19-2010, 03:20 PM
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Drove it a couple times today. The only code I'm getting is the p303, #3 misfire. No kidding, really? LOL I even cleaned the grounds on the back of the intake, the ones for the computer. Come on guys, somebody chime in. I'm spending $18 per day driving back and forth to work, love my Suburban, but it's not a commuter car!!! HELP!!
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Old 08-20-2010, 11:13 AM
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try switching coil packs around to see if the missfire moves. if so, you know it is the coilpack. if not, then i would suspect a broken wire or bad ECU
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Old 08-22-2010, 05:57 AM
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Conure with judojohn,If you find that the new coil is bad replace with oem and not aftermarket coils.
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Old 09-29-2010, 08:51 AM
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Did you ever find a solution to this problem? I experienced hesitation and the CEL flashed at me on my way home last night. I stopped, shut it off, started back up and limped it home at about 40mph. It ran smooth when cruising, but I could feel the misfire under acceleration and a shudder when idling. I scanned the code this morning and came up with P303, misfire on cylinder 3. Being that the car has 130k and the original plugs I put in new NGK platinum plugs. I also switched the coil packs between cylinders 3 & 4.

***I should mention my vehicle is 2003 SE-R with 2.5L***

After driving it again for a little while the hesitation returned and the CEL came back on. I re-scanned it and found that the code was now for a misfire on #4. Based on my swap of the coil packs the code seemed to follow the coil. I am picking up a new coil pack to put in this afternoon. Does this sound like a reasonable solution? I have already gone through the crank and cam position sensor replacement and have zero indication that it could be a leaky head gasket (not going through any coolant, no coolant or coolant smell in the oil, no water or "shiny" looking piston heads upon visual inspection).

I will put a follow up post after I install the new coil pack to let you know what the outcome is, but am interested in any other ideas in the mean time.

Thanks!

Last edited by mike_s; 09-29-2010 at 09:48 AM. Reason: add year and trim level info
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Old 09-29-2010, 02:16 PM
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I installed the new coil on cylinder 4 and "knock on wood" everything seems to be running better. I have ran it about 20 miles since installing and the CEL has not returned. I don't seem to be experiencing the hesitation during acceleration anymore and the idle has smoothed out and returned to normal. I would still be interested to hear any tech opinions if you think this sounds like a solved problem or if there might be more at play.
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