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Engine problems with my 01' Firehawk

This is a discussion on Engine problems with my 01' Firehawk within the General Help forums, part of the LSx Technical Help Section category; Wouldn't I be able to hear a sucking noise if it were a vacuum leak that bad, though?? I don't ...

  1. #21
    Junior Member Sporttster's Avatar
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    Red
    2001 Trans Am Firehawk

    Wouldn't I be able to hear a sucking noise if it were a vacuum leak that bad, though?? I don't hear any air bleed.

  2. #22
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    Not necessarily. It doesn't take much.


    I saw that you replaced the O2's after the headers install.

    What kind of headers? Ceramic Coated?

    I asked becasue I've heard of guys needing to swap out the O2's because of the stuff that coat the headers with can have some excess still in the tubes when ship which can kill/damage O2's till they get a few heat cycles ran to burn them off. This was 6 yrs ago when I got mine but I remember Texas S&P told me not to switch out my O2's for new ones till I had a few heat cycles on them.

    Also have you looked at the exhaust where the collector and ORY meet? Check to make sure you have a tight clamp. Air can be pulled in and effect the O2's also.

  3. #23
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    Black & Blue
    '02 WS.6 / '07 Suburban

    Do you have access to a scanner that allows you to see live engine data?

  4. #24
    Junior Member Sporttster's Avatar
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    2001 Trans Am Firehawk

    No access to scanner. Not ceramic coated for headers. Yesterday, I cleaned the throttle body and the MAF with MAF cleaner and also cleaned and re-oiled the K&N filter. Still have the check engine light, it does seem to idle a bit lower, though, and maybe a bit of the exhaust smell has lessened. It smelled pretty strong before.

  5. #25
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    Black & Blue
    '02 WS.6 / '07 Suburban

    A dirty or faulty MAF will affect fueling. The simplest test for a faulty MAF is to unplug it. This forces the PCM to run in speed density where, rather than measuring airflow, it is estimated through other sensor readings, such as MAP and RPM. You will set a code from unplugging the MAF, however, if the engine begins running better with it disconnected then that points to an issue with the MAF.

    Honest answer... ditch the K&N and install a quality paper or nanofiber dry media air filter (such as an Amsoil Ea). K&N allows way to much dirt to enter your engine, plus the oil gets sucked onto the MAF wires and insulates them when dirt builds up causing it to read incorrectly.

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