Manifold cat delete mod, now engine light? - Chevy Colorado & GMC Canyon
 
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post #1 of 8 (permalink) Old 06-24-2011, 02:08 PM Thread Starter
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Manifold cat delete mod, now engine light?

I did the manifold cat delete mod a couple weeks ago and the other day the check engine light came on. Had it tested and they said it was insufficient catalist performance. Just wondering if anyone else has had this problem, and if so what the remedy was. I had to replace the rear cat when I first got the truck do to broken catalist material and when I did I installed a high flow in its place. The truck is an 04 rado z71 crew cab. Any help would be greatly apriciated. Thank you
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post #2 of 8 (permalink) Old 06-28-2011, 10:19 AM
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Re: Manifold cat delete mod, now engine light?

When I got my header put on a couple of weeks ago, the engine light popped on and I had it scanned and it came up with low voltage for the second o2 sensor...which makes sense since the o2 is not hooked up anywhere I just have it wedged by the transmission lines. As far as your cel you can either do the cheap method and put a piece of black electrical tape over the light so you won't have to look at it, or get it tuned and have the cat tuned out.

2007 GMC Canyon 3.7L SLE Crew cab 4x4
K&N CAI
All-Flow cat in place of 2nd cat
Intake Resonator Delete
JTR Shorty Header
Sound Solutions muffler
31x10.5R15 Wild Country MTX
1971 Pontiac Catalina 400
1969 GMC C2500 305 V6
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post #3 of 8 (permalink) Old 06-28-2011, 06:42 PM
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Re: Manifold cat delete mod, now engine light?

or do the nonfouler mod. and be completely obd2 emissions legal.
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post #4 of 8 (permalink) Old 07-10-2011, 04:57 PM
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You need to put the O2 sensor back in the hole to avoid your problem. The sensor has a ground circuit and the computer is picking up no signal. You should have no problems with your light after this. Most everyone on here has a cat delete. The header should have come with a bung hole for the O2 sensor. You may have to extend your wires if this is long tubes.
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post #5 of 8 (permalink) Old 07-11-2011, 11:42 AM
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Quote:
Originally Posted by puddleman View Post
or do the nonfouler mod. and be completely obd2 emissions legal.
THIS

the non fouler will set the downstream o2 farther away from the stream and read lower than the one upstream. simple $10 part if that. and half hour or work.

Coloradofans.com Rig Of The Month July 2011
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post #6 of 8 (permalink) Old 08-19-2011, 06:27 PM
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the non fowler can work but screwing the sensor normally makes no difference, i believe pcmfor less can fix that issue
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post #7 of 8 (permalink) Old 08-21-2011, 06:25 PM
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New to the site. Has anyone done this due to rottin egg smell? Coming back from the beach the other day(3 hour drive) and half way when we stopped I smelled it. Still their when we got home to. I think its the cat but only have 38,000 on a 06 and just got it in june.
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post #8 of 8 (permalink) Old 08-22-2011, 01:23 PM
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factory emissions have a long warranty, check it out
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