2005 sentra codeP0303 - Nissan Forums : Nissan Forum
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#1 Old 05-06-2013, 10:50 PM
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2005 sentra codeP0303

It keeps reading the code P0303 "cylinder 3 misfire". All coil packs, fuel injectors, spark plugs have been replaced. The exhuast smells normal. The oil is the correct color(maple syrup color, NOT milky). It's not blowing through coolant. Compression test came back normal. It's not the cat converter because the exhaust doesn't smell like rotten eggs. The car is sometimes hard to start. it hesitates/stumbles and shakes really bad. It feels like its not getting enough power. It's always had its routine maintainence work done as well(oil changes, etc)..

Anyone have any advice on what's going on or what to do next? I. Completely at a loss on what to do.
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#2 Old 05-07-2013, 03:48 AM
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51 people have viewed this. I sure someone has experience with this! Please help me out!!! I'm so frustrated with this car cuz I can't figure out what's going on!
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#3 Old 05-07-2013, 03:51 AM
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Have you removed the valve cover and taken a look inside to see if any oil is leaking inside the plug?

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#4 Old 05-07-2013, 03:54 AM
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There is no oil leaking. We took out the plugs and all were dry too. Did a compression test on all 4 cylinders and came back fine.
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#5 Old 05-07-2013, 03:55 AM
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Is that the only code you have?

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#6 Old 05-07-2013, 04:25 AM
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Before I replaced the fuel injector yesterday it pulled codes P0303 and P0300. But after I replaced them it went away and I started driving, got maybe 3miles down the road, and the engine started to stumble and feel like there was no power to accelerate. When I turned around I did the code reader and it only said P0303 again.
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#7 Old 05-07-2013, 05:16 AM
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Maybe fuel pump?

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#8 Old 05-07-2013, 11:44 PM
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.as far as the fuel pump, That could make it run real low in power and have random misfires, But not just cyl 3 which is the code the car is pulling up(P0303). If it was the fuel pump it would probably pull code P0300 which is random/multiple engine misfire.
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#9 Old 05-08-2013, 10:16 AM
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you might want to take another look at the converter. that it doesn't smell like rotten eggs isn't a very good diagnostic. a clogged or clogging cat will cause the exact same issues your having. other than that, it sounds a lot like a fuel pump problem. loosing pressure and not delivering enough fuel.

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#10 Old 05-08-2013, 06:22 PM
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But if it was one of those issues shouldn't it pull a different code other than just P0303(cylinder 3 misfire)?
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#11 Old 05-08-2013, 06:23 PM
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Sorry, I just don't want to spend a lot of money on something that isn't wrong. I want to be sure because I've already thrown so much money into this car.
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#12 Old 05-08-2013, 06:24 PM
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there's only so many things that can cause a cylinder misfire, and you've replaced the plug and coil pack. could also be a crank or cam position sensor. but it could be that cylinder 3 is the first one to misfire and that's the code it's storing.

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#13 Old 05-08-2013, 06:32 PM
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How can I test to see if its the fuel pump failing or the cat converter?
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#14 Old 05-08-2013, 06:52 PM
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not sure, but you can test the pressure on the pump. not sure about the cat. but like I said, could also be a crank position sensor. that would cause the plugs to fire at the wrong time.

Personally, might want to take it to a shop at this point. diagnosing generic codes is pretty hard.

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#15 Old 05-11-2013, 07:45 PM
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What about a bad crankshaft position sensor? Do you think that could possibly be the problem?
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