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2002 LS1 engine surge/miss

This is a discussion on 2002 LS1 engine surge/miss within the General Help forums, part of the LSx Technical Help Section category; Hello Again. I have a engine surge/miss problem. I first thought it was a bad tank of fuel, but after ...

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    Junior Member vonny's Avatar
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    Angry 2002 LS1 engine surge/miss

    Hello Again. I have a engine surge/miss problem. I first thought it was a bad tank of fuel, but after pumping it out and filling twice with fresh, its still acting up. There is no check engine light and what its doin is this- doesnt matter if its cold or warm, just off part throttle it starts holding back. I have a camaro with LS1, 6 speed, heads/cam/etc making 425RWHP. I can feel it acting sluggish, but still seems to go pretty good while acting this way. With a scan tool we cant see anything wrong...feels like a slight missfire. Its ok at just off idle (going up a gradual hill easily), but as soon as you push a little harder it starts to act sluggish again. I can hear it in the exhaust that there is something not right..and once in a while it will accelerate perfectly,,only to act up the next time. Im wondering if its an injector, slight head gasket leak, fuel pump failing, ?? Any Ideas. Also, I just installed new plugs and that wasnt it. The ceramic cones on the plugs had a shade of red on them, but looked to all be firing and were clean. If anyone has had this before, or any suggestions, please let me know what it was. Thanks.. Vonny

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    Senior Member TLS_Addict's Avatar
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    How many miels on your car?

    I had an issue like this on my Regal GS. Though not high performance like your car it acted the same way. When I replaced the fuel filter the car ran perfectly. I was clogged really bad. Changed it an problem solved.

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    O U 8 1 2 Spaz's Avatar
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    could be a few things... first start off with some MAF cleaner... check your fuel pressure... when is the last time you changed your fuel filter??? if you have cats one might be clogged...

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    Moderator 35th-ANV-SS's Avatar
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    Sounds like a MAF or cat problem to me. Cats can go bad and not trigger a SES light

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    O U 8 1 2 Spaz's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    Sounds like a MAF or cat problem to me. Cats can go bad and not trigger a SES light

    that is what happened to me...

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    Junior Member vonny's Avatar
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    I cleaned the Mass Air Sensor, and Fuel Filter was replaced. Same thing. Im gonna check fuel pressure and then onto the cats.

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    Senior Member TLS_Addict's Avatar
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    Does it do it when the car is hot or cold or both?

    Will it do it when it you first start the car up?

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    Junior Member Fine 69's Avatar
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    Mines doing it too...Have you found the problem yet ???No cats on mine

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    Junior Member vonny's Avatar
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    Fixed...After LOTS of testing and testing of different items, it was dirty Injectors. Had the Injectors professionally cleaned and it runs great. I think they may have been getting dirty for a while, man does it run good now. Thanks for all the replys!

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    Do you mind I ask what it cost to have the injectors professionally cleaned and could any mechanic shop do it? Thanks

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    Junior Member vonny's Avatar
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    I own a Car Dealership and should have brought it to my guys weeks before. I thought I would have been able to figure it out. They had it figured out in less than 1/2 hour. We have some sort of can that hooks directly to the fuel rail and it runs on the can. the can has serious cleaners in it. I would think that any good repair shop should be able to perform this. Good Luck. We charge around $100 to perform for customers. Takes roughly an hour.

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    Moderator Cutlass's Avatar
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    ^^^Yes we have the same fuel injection system cleaner setup at our shop and I've seen it cure dirty injector misfires and running issues many times. Its good stuff

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    Junior Member vonny's Avatar
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    I was on the Hot Rod Power Tour (my 7th time), and got a bad tank of fuel in Iowa. I should have burned it through before parking it. It sat for about 3 weeks before I took it out again, and thats when the problems started.

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