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02-14-2014, 01:19 AM
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#1 |
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Registered User
Join Date: Oct 2002
Location: West Des Moines, Ia
Posts: 3,233
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Cat delete
So previous owner removed the cats from my 1990 suburban because of this while driving on the highway or for longer periods of time the o2 sensor sets off the check engine light. Kinda annoying. Is there a way to bypass this without putting cats back on the truck
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Krazy Texan My Trucks are made with Wrenches not Chop Sticks 1967 GMC 3/4 ton "Johnny Cash" 1990 v1500 suburban 1967 Ford f100 Swb 4x4 "green bean" GOD BLESS JESUS, JOHN WAYNE, AND THE ALAMO |
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02-14-2014, 01:54 AM
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#2 |
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Registered User
Join Date: Jan 2009
Location: Louisville,Ky
Posts: 5,811
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Re: Cat delete
Why not have some cheap high flow ones put back on it?
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02-14-2014, 06:53 AM
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#3 |
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Registered User
Join Date: Jan 2013
Location: Jasper, IN
Posts: 948
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Re: Cat delete
^ high flow ones are pretty much a straight pipe with a cage around it. Looks like a cat but isn't.inspector is happy for the looks and you're happy for the performance... Win win!!
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When in doubt, throttle it out! 1974 Chevrolet Custom K20 2005 Ford Ranger Edge 1985 Chevrolet Custom Deluxe C10 |
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02-14-2014, 07:25 AM
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#4 |
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Registered User
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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Re: Cat delete
Electrical tape over the Check Engine light...
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02-14-2014, 07:34 AM
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#5 |
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Registered User
Join Date: Jun 2004
Location: El Lago, TX
Posts: 1,668
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Re: Cat delete
Maybe try a heated 3 wire 02 sensor. You run the extra 2 wires to keyed power and ground. I use one with headers and no cats and the check engine light doesn't come on.
Last edited by Greenlee; 02-14-2014 at 10:18 PM. |
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02-14-2014, 06:22 PM
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#6 |
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It'd be alot cooler if you did
Join Date: May 2003
Location: Three Rivers, MI
Posts: 2,345
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Re: Cat delete
I've never had cats on my 91 and its never had a CEL...
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02-15-2014, 12:00 AM
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#7 |
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Registered User
Join Date: Dec 2006
Location: SLC, UT
Posts: 706
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Re: Cat delete
How did you come to the conclusion that your lack of cats is causing the O2 sensor reading to trip the CEL?
Are you sure the issue isn't the 02 sensor itself? Since the 02 sensors are upstream of the cat in these trucks, the lack of a cat should have little to no bearing on the readings the 02 sensor is sending to the ECM. |
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02-15-2014, 12:37 AM
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#8 | |
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Registered User
Join Date: Jul 2012
Location: Des Moines IA
Posts: 1,250
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Re: Cat delete
Quote:
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- 1981 Sierra 454, NV4500 swap - 2006 Z06, 25k miles - 1973 Nova - Project CarNova Virus on Youtube |
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02-15-2014, 05:58 PM
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#9 | |
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Windy Corner of a Dirty Street
Join Date: Jun 2003
Location: Pueblo West, Colorado
Posts: 2,926
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Re: Cat delete
Quote:
It is a Federal Crime to remove the cats but it is okay to use a “test pipe”. I’ve been testing this “Test Pipe" for a few years on my ’89 Burb and so far the “test” is going well. I think I will keep “testing” it for a while longer.  The CEL has never come on either.“Test pipe” viewable on the far left 
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Current vehicle collection: 1978 Chevrolet K10, 8.1L, NV4500, NP205 1989 Chevrolet Suburban, 8.1L, NV4500, NP241 1993 Chevrolet C1500 Sportside, TBI 7.4L, 4L60E 2001 Chevrolet K2500HD, Ext Cab, SWB, 8.1L, ZF 6 speed 2014 Chevrolet Impala LTZ 3.6L Vortec 8.1L because life is too short to tolerate underpowered vehicles
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