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99 z28 lacking power

This is a discussion on 99 z28 lacking power within the General Help forums, part of the LSx Technical Help Section category; spark plugs? fuel injecters? at first i thought it was happening because a bad batt connection she would run killer ...

  1. #1
    Member mingo99z's Avatar
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    99 z28 lacking power

    spark plugs? fuel injecters? at first i thought it was happening because a bad batt connection she would run killer then fall on her face when trying to get on it. i have the six speed and never had a problem lighting up the tires get a bark first through forth and now barley when dumping the clutch in first. buying the best gas in town and put a little octane got a little better but around 4000 rpm starts to sputter and no power lame. any ideas if plugs what kind stock? injecters? what is the best way to pull out the back plugs. app any advice and thanks for takeing the time.

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    Smiles for 9.5 Years cammed goat's Avatar
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    IMO the first thing you should do is check/clean your MAF sensor. When those things get dirty our cars start to gag and fall on its face. Try that for starters. Use CRC MAF cleaner if that is available at your nearest parts store.

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    Member Badass WS6's Avatar
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    My Z lacked power randomly when my fuel pump was going out(over the course of about a month and a half).

    Fuel pump maybe? Or fuel filter?

    Just some thoughts...Good luck finding the culprit.

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    Member mingo99z's Avatar
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    where is the maf sensor?

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    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by mingo99z View Post
    where is the maf sensor?
    Looks like this...before your throttle body


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    Moderator 35th-ANV-SS's Avatar
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    You can also try checking to see what your fuel pressure is at the fuel rail if cleaning the MAF does not help your situation.

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    Member mingo99z's Avatar
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    any tips on takein it off.

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    Moderator 35th-ANV-SS's Avatar
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    there is a band clamp on the front and back side of it. Loosen them and pull it loose. Unplug the wiring harness from it before you go pulling on it though.

    Pretty simply...you'll see once you see it.

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    Smiles for 9.5 Years cammed goat's Avatar
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    Loosen the clamps that hold the MAF on(flathead screwdriver) and remove the MAF from the throttlebody and airbox. Spray with MAF cleaner or brake cleaner and let dry. Then reinstall. While you are at it, take a rag and clean the inside of the throttlebody and blade.

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    Member mingo99z's Avatar
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    thanks for the info first thing in the morning ill get on it. how about any tips on changing my plugs on my one. what is the best way to get to the back ones on the passengers side and what is a good plug to put back in?

  11. #11
    TJEA Retirement Home Dr.Crash's Avatar
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    It makes it easier if you take the coil packs off. Get a socket extension and a swivel attachment. I run NGK's in my car and they seem to work great. good luck

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    Likes twisty roads bene's Avatar
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    Quote Originally Posted by mingo99z View Post
    thanks for the info first thing in the morning ill get on it. how about any tips on changing my plugs on my one. what is the best way to get to the back ones on the passengers side and what is a good plug to put back in?
    Bottom for the the last one at the back. NGKs.

  13. #13
    O U 8 1 2 Spaz's Avatar
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    your catalytic converters are most likely the problem... the engine is trying to push out a great amount of gas through clogged cats making it bog down... i'm willing to bet your car drives almost fine under normal driving but seems to die out at high rpms or when you get on it...

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    TJEA Retirement Home Dr.Crash's Avatar
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    Quote Originally Posted by Spaz View Post
    your catalytic converters are most likely the problem... the engine is trying to push out a great amount of gas through clogged cats making it bog down... i'm willing to bet your car drives almost fine under normal driving but seems to die out at high rpms or when you get on it...
    Good point. I woundn't have though about that since i no longer have that problem. Yet somehow i still pass California emissions

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