LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

If I go with non emmissions headers

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Old Feb 20, 2007 | 09:56 PM
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Walkersteelhead's Avatar
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If I go with non emmissions headers

I was considering going with non emmisions headers to clean up the engine bay. What do I have to do to get rid of the emmisions?
Old Feb 20, 2007 | 10:14 PM
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Eliminate the smog pump and all associated lines, and block off the port in the back of the intake where the flexible air tube came in from the passenger side. EGR blockoff plates are available from UMI, Street & Performance, and others, or you can easily make your own out of steel or aluminum plate.
Old Feb 20, 2007 | 10:19 PM
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When I have my pcm tuned do I have to specify no smog pump?
Old Feb 20, 2007 | 10:23 PM
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It wouldn't hurt, but I have removed it on every 4th gen I have ever had (94, 95, 97) and never got a code; in my experience, it only coded when it failed, not when it was removed. I would have the EGR functions programmed out though, at least if you are removing the EGR solenoid as well (it can be handled with a resistor in the wiring plug, but if youre having it programmed might as well program it out). I have never gotten a code from just removing the EGR itself.
Old Feb 21, 2007 | 07:56 AM
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Thanks ss for the replies. Also besides the cleaner engine bay any other benefits from getting rid of the emissions?
Old Feb 21, 2007 | 07:58 AM
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Originally Posted by Walkersteelhead
Thanks ss for the replies. Also besides the cleaner engine bay any other benefits from getting rid of the emissions?
Nope.
Old Feb 21, 2007 | 08:01 AM
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Originally Posted by Walkersteelhead
When I have my pcm tuned do I have to specify no smog pump?
With your car being a 95, you may not need tuning at all. As long as you keep a functional electrical circuit with an intact fuse for the AIR pump, you shouldn't trigger an SES light. As for the EGR, it is a hit or miss. Some people get an SES light, some don't.
Old Feb 21, 2007 | 08:37 AM
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Good to know. I will be getting a pcm tune because I'm also doing a head cam swap.
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