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#1 Misfire

This is a discussion on #1 Misfire within the General Help forums, part of the LSx Technical Help Section category; I just joined the forum and have a 01 10th anniv firehawk. For the last 2 and a half months ...

  1. #1
    Junior Member
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    Black and Gold
    2001 10th Anniv Firehawk

    #1 Misfire

    I just joined the forum and have a 01 10th anniv firehawk. For the last 2 and a half months i have been getting a number 1 misfire code. There is a slight loss of power and you can tell its misfiring epically in between shifts and my mpg have gone way down. This is what i have done since it started: Got new 02 sensors both on each side, got a fuel system flush, new fuel filter, new plugs and wires, new coil packs, and new injectors. Still threw the code so just to make sure i swapped the coil pack, plug, wire, and injector from cylinder 1 to 2 to see if the the code would follow...stayed the same on number 1. Then I had the Fuel PSI checked and was told that it was what it was supposed to be. To make sure it wasn't the connector for the injector i checked it with a test light to make sure it was pulsating and a steady interval which as far as i can tell it was. If anyone has any suggestions i'm all ears because i'm out of ideas. Thanks.

  2. #2
    Member zmg00camaross's Avatar
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    pewter
    2000 camaro ss

    Maybe you have a intake gasket leak and sucking unmeter air into the cylinder 1 and creates a lean misfire.

  3. #3
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    Black and Gold
    2001 10th Anniv Firehawk

    I sprayed carb cleaner around the intake gasket while the car was at an idle to see if i could hear it slow down a little while recording the rpms on the programmer i have to see if there was any drastic change after getting a baseline reading before hand. There was no change in the sound or between the two readings in rpms(pre and post readings only varied by less than 40 rpms going from 789-825). Is there another way to check the gasket besides pulling the intake off?

  4. #4
    Member zmg00camaross's Avatar
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    pewter
    2000 camaro ss

    Well the short term fuel trim would change and it might change with temp. Check when cold and hot because of expansion

  5. #5
    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Check the compression of the cylinder???

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