Question about 2005 Nissan Altima

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I am helping my daughter with her 2005 Altima 2.5 They were driving it on the highway and the check engine light came on, started missing, loss of power. It was smoking white (not like a burning type of smoke but a vapor type). When at idle in gear engine shakes badly. When they got home (drove for 1 hour that way)I pulled codes, I have a scanner. It came back with bank 1 02 sensor 2. And engine lean code. We changed out the downstream 02 sensor. I cleared the codes and they drove the car to see if new codes would reappear. The problem with running was not fixed, they drove it 60+ miles with 5-6 cycles. I checked it again and there are no new codes. Not sure if that was enough runnning to generate new codes. I started checking further, I checked and all coils are firing, got new plugs and did a dead cyl test. While engine was running we pulled #1 coil, engine rpm dropped off real bad, put coil back on got better. Pulled #2 coil, no difference in the way engine was running, put back on again no change seems cyl is dead, pulled #3 coil and had the exact same thing happen as with #2 seems dead, pulled #4 and it dropped rpm severely when removed and got better when coil was replaced. Seems #1+4 are ok and #2+3 are dead. We looked at the plugs and 2+3 were wet and 1+4 where the right color off white color. Now I did a compression check. #1+4 where 170 psi warm not hot, #2+4 where 190 psi. This seems strange to me as I would think if these cyl were dead the compression would be lower. I am not a student of new technology so I sure would appreciate help here. Any suggestions? Where should I look next?

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  • cybor462 Apr 18, 2009

    The plugs (Old Plugs) were wet with fuel. When we changed out the new plugs and ran it at idle they were not as wet but where wet.

    We connected the spark plugs to each coil and grounded them and had a good clean spark from them all. I know this is not the best test as if the coil is weak it could blow out under compression. Do you know of a better way to test the coils like with an ohm meter?

  • cybor462 Apr 18, 2009

    What about my compression reading? Strange they are off by 20 psi on the 2 cyl we are having trouble with and stranger that they are higher than the two that are working right.

  • cybor462 Apr 18, 2009

    This engine does not have wires. The colis connect directly to the plugs. It is like a hemi head.

  • cybor462 Apr 18, 2009

    Sorry for the mispells

  • cybor462 Apr 18, 2009

    I will go check the coils and post when I have it tested.



    Thanks

  • Anonymous Mar 15, 2014

    check engine light came on. I had a code pulled up and it said misfire in cyl 2. I changed all 4 plugs and heating coil for only cyl 2. I started the car back up but, the check engine light is still on. i had the code pulled again and its is still reading misfire in cal 2. I came back and took everything apart again to check the connection. Everything seems to be good as far as that is concerned. I even took detached the battery to let the computer reset. I'm having no luck.. Please, do you have any other suggestions??

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First thing you can do to eliminate a possible cause is trade the coil packs between 1&4, and 2&3. Check again and if 1&4 are now dead, then you replace the bad coil pack.

You stated that the plugs were wet, but didn't say from what. What did the plugs smell like? Oil, fuel, or coolant?

Please let me know what was on those plugs, as there could be other causes as well.

Posted on Apr 18, 2009

  • charles raynor Apr 18, 2009

    You can try to check the coils with an ohmmeter, and if they are off by even a few Kohms replace them. Also check your spark plug wires, they should be somewhere close to 2K ohms per inch.

    The difference in compression readings could be from liquid fuel gathering in the cylinders, changing the compression ratio.

    My thoughts and experience on the difference in the readings comes from having a head crack on me, and coolant seeping into the cylinders.


  • charles raynor Apr 18, 2009

    Ok sorry on the wires thing. Is there a wrecking yard near you that is open today? If so, call them up and see if they have a set of coil packs for your daughter's car. I suggest this because those things can get quite expensive from an auto parts store or the dealer. More often than not, the wrecking yard will test things like that before offering them for sale.

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