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2007 Nissan Altima Question: Have a random misfire now that was once showing up as cylinder 1 and 3 misfire.

 

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hunter1984, 2.5L 4 Cylinder, Galveston, TX, April 14, 2013, 12:05
 Rookie

Changed plugs with oe plugs and moved coil packs around to see if misfire would move to different cylinder. Same results. Changing intake gaskets now because read a lot of people say that was the issue. Never had this bad of an misfire due to a intake leak but thought for the 20$ gasket set what the hell. Worried that its not gonna fix my issue.

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  • Answer #1

    April 14, 2013, 12:12
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     Master

    Engine at idle, spray a little wd-40 with the straw attached directly onto intake where suspected leak is to see if it smooths out. If so then gasket is leaking, if not need to test further for source of misfire.

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    hunter1984, April 14, 2013, 16:19
     Rookie

    Im really ase certified just do it on the side now at the house. Its my best friends car and after I checked the most common issues, I started checking what other people were having problems with and it seemed that most of the issues Im having were due to intake leaks. I did check for leaks by spraying water around the intake (that was the way I was tought) and its never failed me yet but it didn't get noticeably worse but as Im sure you know on this intake its hard to check that intake due to theres no room to cover the entire manifold. I already have it pulled apart and have the parts. Also ran compression test and tested injectors. Just want to see what someone who has worked on more altimas than I. Thanks for the response buddy. The one thing that stood out was with my scanner it showed 0 for rt ft.

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