Smog Pump Removal?
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Smog Pump Removal?
Hey guys, i have a couple quick questions, ill just cut right to the chase. I have a 1990 Ford F250 with a 460. Are those two tubes that go into the cat for the smog pump? Second, what is the best way to remove this system if I were to do some aftermarket exhaust work on my truck? If i were to just disconnect them from the cat, will that throw my check engine light or affect the way my engine runs in any way? If so, like i said, what would be the best way to remove this system from my exhaust system without affecting my engine or throwing codes? Thanks in advance! 
Hotshot
Joined: Jun 2015
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OBD I computers don't sample the exhaust after the cat conv like OBD II does so the computer would not know the cat conv has been removed. However, it is technically against the law to remove it. Are you replacing the manifolds with long tube headers? If the convertor is bad replace it with a good quality high flow one and be done. I take it you don't have emissions testing or inspections there.
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Smog Pump Removal
I am not entirely sure how I will have my system set up yet, and no, up here in Minnesota, we have no annual car inspections. I just wanted to get my question answered about the effects of removing the smog pump from the cat before I got too far into my planning. I have an '89 Chevy that is running with no cat and no muffler. Because they rusted off and litterally dropped down and parts were scraping the road while I was driving. It is a screaming loud truck, but I have yet to be pulled over because of it. But, anyway, so removing my smog pump from my cat will not affect anything on how my engine runs?
Fleet Owner
Joined: Oct 2005
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From: Kentucky
The air pump is there to shorten the warmup time of the converter. Some documentation states there is air injected at other times but I am not 100 % certain on that.
If you keep the engine tuned up there is no reason to worry about removing the system. As long as you keep the TAB and TAD solenoids electrically connected you will not trigger a Check Engine Light. You will fail a few KOER tests, but that will not trigger a CEL.
The factory converter is an effective bottleneck and is pretty much worn out at this age. Seriously consider an aftermarket high-flow replacement.
If you keep the engine tuned up there is no reason to worry about removing the system. As long as you keep the TAB and TAD solenoids electrically connected you will not trigger a Check Engine Light. You will fail a few KOER tests, but that will not trigger a CEL.
The factory converter is an effective bottleneck and is pretty much worn out at this age. Seriously consider an aftermarket high-flow replacement.
Postmaster
Joined: Nov 2011
Posts: 3,533
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From: SW Florida
And none of the aftermarket replacements need air injection so bye bye smog pump and associated mess of hoses and pipes. You can either figure out how to make it work with a shorter belt, or get an idler pulley to put in place of the pump.
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drunkenrich
1987 - 1996 F150 & Larger F-Series Trucks
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Jun 12, 2010 05:49 AM
