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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

pacesetter install

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Old Sep 12, 2008 | 02:02 AM
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Default pacesetter install
has anyone had problums with the headers and y=pipe hitting the bodey and making large tumping noise? and also what would cause the motor to rock hard at idle?
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Old Sep 12, 2008 | 02:34 AM
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Yes, there was jus a thread a day or so ago with a guy saying how he fixed his! If it has a rough idle it could be a vacum leak, check to make sure no wires r touching the header melting or arching out, and also make sure you put them back in the right order!
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Old Sep 12, 2008 | 07:15 AM
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or motor mounts?
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Old Sep 12, 2008 | 09:15 AM
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I'm going to say motor mounts aswell, they are a bitch to put in. Well, at least they were for me when I put some in an ls1.
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Old Sep 12, 2008 | 01:19 PM
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i put a polyuratne motor mount on the passanger side, i couldn't find the different shape driver side. could this cause the problum?
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Old Sep 12, 2008 | 04:37 PM
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Im having this same problem :S It seems like the flat spot on the y pipe is hitting the cross member, or the header itself is hitting the floor boards :S I really hope it isnt the motor mounts.
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Old Sep 12, 2008 | 06:43 PM
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i had to pull down on the driver side header...it worked for me
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Old Sep 12, 2008 | 06:57 PM
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also, when the headers were installed and rear o2 sensors removed, did anyone get a SES light?
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Old Sep 12, 2008 | 09:35 PM
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Originally Posted by BigBadWhitey
also, when the headers were installed and rear o2 sensors removed, did anyone get a SES light?
you would need simulators or a tune.
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Old Sep 12, 2008 | 09:41 PM
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Originally Posted by bad99transam
problems with the headers and y=pipe hitting the body
Put a piece of heater hose between the header and undercarriage = problem solved (1 of them anyway).
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Old Sep 12, 2008 | 10:20 PM
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Originally Posted by 954mula
Put a piece of heater hose between the header and undercarriage = problem solved (1 of them anyway).
youve tried this?
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Old Sep 12, 2008 | 10:32 PM
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i think that would just burn the hose and is not a good idea
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Old Sep 13, 2008 | 12:25 AM
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to the OP, do you have a polly mount on one side and not the other? If so then maybe that could attribute to the problems your having. I would put one or the other.
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Old Sep 13, 2008 | 12:28 AM
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You need to get under there and bend the top of the pipe. What I did was use a crow bar and wedged it between my car and pipe. I pried on it and it bent the pipe. Worked great. That's what you get when you buy cheap right? Lol.
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Old Sep 13, 2008 | 12:37 AM
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ive done several installations on customer vehicles and i found the best way is to beat the floorpan upwards of course i do it to where you cant tell it was beat to hell. then install the longtubes it will either rub a little bit or none at all. but yeah its normal to bang/

oh yea i have 02 sims for sale if you need them pm if interested
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Old Sep 13, 2008 | 10:49 AM
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mine hits occasionally as well but one thing you can do is have a welder weld in a spring from your valvetrain if you have an old one lying around (not your current valvetrain)...provides the cushioning and still allows it to flex under load...I didnt do this to mine as it isnt bad at all
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Old Sep 13, 2008 | 11:59 AM
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Originally Posted by BigBadWhitey
also, when the headers were installed and rear o2 sensors removed, did anyone get a SES light?
Yes, and it will also cause your cooling fans to come on more than likely. If you already have intake,headers, you might look into getting a mail order tune. Doesn't cost much more than o2 sims (plus they are getting hard to find!)

Originally Posted by 954mula
Put a piece of heater hose between the header and undercarriage = problem solved (1 of them anyway).
I've heard this works great, for some reason i never had this problem though, got lucky i guess.
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