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pacesetter Lts installed now knocking.

This is a discussion on pacesetter Lts installed now knocking. within the External Engine forums, part of the LSx Technical Help Section category; i installed pacesetter Lt headers and now im getting a bad knock like there hitting under the car. you can ...

  1. #1
    Member krug07's Avatar
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    pewter
    01 trans am ws6

    pacesetter Lts installed now knocking.

    i installed pacesetter Lt headers and now im getting a bad knock like there hitting under the car. you can feel it and hear it. how do you fix this? also on my way home i got on it a little to pass someone and the ses light started flashing. i dont know whats that about. i took the egr off haven't plugged them yet. also the 02 sensers are hanging we forgot to zip tie them if thats what i can do with it or tuck them somewhere? any ideas on all this?

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    Member krug07's Avatar
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    pewter
    01 trans am ws6

    anyone??

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    2001 ws6 6-speed david_viny's Avatar
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    2001 Pontiac Trans Am WS6

    IIRC I think 01-02 LS1's dont have an egr valve. And do you mean the front O'2 sensors are not hooked up or the rear? Fronts not hooked up could mean trouble. Do you have the rest of the exhaust hooked up?

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    Member Bouvers's Avatar
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    the knocking is likely the y pipe this occurs quite often it either has to get fixed with some serious bending or placing rubber between the exhaust and the body where its hitting.

    make sure you delete the rear o2's and make sure your front o2's are hooked up...

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    member since may 2000 nhraformula's Avatar
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    take it to an exhaust shop and have them heat up and bend the y pipe downwards
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
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    Member Bouvers's Avatar
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    Blue 1997 Trans Am(Sold)
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    +2 if you want it done right

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    Member krug07's Avatar
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    pewter
    01 trans am ws6

    the rear o2's are delated the front are connected but the headers came with longer wires for the front 02 sensers so i dont know where to place them they are just hanging and getting on the headers which we put alot of electrical tape on the wires. but it needs to be off the headers and out of the way or its going to be burnt up in a matter of time.should i ziptie them to something under the car? and any idea why the SES light flashed all the sudden? the rest of the exhaust is connected to the y then a cutout and i have hooker catback exhaust also.

  8. #8
    15 sec. Oh yeah, its fast UTVols98's Avatar
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    The exhaust rattling on the floorboard could be setting off the knock sensor causing your SES light to come on.

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    Impounded
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    79 T/A -91 Firebird
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    Flashing SES=Misfire

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    Yeah I just did the same install, mine is hitting something under the car too. Going to try to do something to fix it. I was thinking the same thing with the rubber shim.

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    So you guys suggest taking it to an exaust shop and having the y pipe heated and bent down more than just puttin a rubber shim in it? I don't really like the idea of heatin up the Y pipe and bending it down, sounds like it not only cost me ground clearance but also weaken the durability of the pipe.

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    Member krug07's Avatar
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    pewter
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    im curious also about them bending the y by heating it up.

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    I've got the same problem thinking of trying polyurethane motor mounts.

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    Member WS6ICK2K's Avatar
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    Bending the Y pipe is very common. They just bend it down slightly enough to stop the knocking on the bottom of the car. It will not compromise ground clearance enough to worry about, even on a lowered car. I had to zip tie my 02 senors also, just use your imagination to get them away from heat its nothing critical.

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    Member Bouvers's Avatar
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    Quote Originally Posted by Blackout01 View Post
    So you guys suggest taking it to an exaust shop and having the y pipe heated and bent down more than just puttin a rubber shim in it? I don't really like the idea of heatin up the Y pipe and bending it down, sounds like it not only cost me ground clearance but also weaken the durability of the pipe.
    not really think of all the other f-bodies out there with a y-pipe... they all have the same amount of space between the midpipe and floorboard as what you want to accomplish to stop contact... you won't have any less clearance then what is actually intended...

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by Blackout01 View Post
    So you guys suggest taking it to an exaust shop and having the y pipe heated and bent down more than just puttin a rubber shim in it? I don't really like the idea of heatin up the Y pipe and bending it down, sounds like it not only cost me ground clearance but also weaken the durability of the pipe.
    i did the rubber thing at first and it vibrates.
    i had my y pipes heated and bent over 3 years ago and the pipes were not weakened.
    they only bent them like half an inch downwards so i didnt lose any clearance

  17. #17
    Junior Member harri_z28's Avatar
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    02' z28 camaro

    can you have them bend them with them on the car? or tdo you really gave to take that damn y-pipe off again?

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    Yeah seriously, it will be cost way too much money if they got to take the Y pipe off, and where exactly does it need to be bent?

  19. #19
    Junior Member harri_z28's Avatar
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    pewter
    02' z28 camaro

    like right under the driver side floorboard.

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by harri_z28 View Post
    can you have them bend them with them on the car? or tdo you really gave to take that damn y-pipe off again?
    a muffler shop will put your car on a lift. they then get underneath the car with a torch, heat up the y pipe (1 inch wide if that) then bend it downwards with a crobar or whatever.

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