Question about 1996 Chevrolet Tahoe

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Check engine light was on with many codes, fixed all problems( all new exhaust, magnaflow cat system, flow master muffler, all o2 sensors were replaced, gave a tune up using MSD wires cap and rotor and e3 diamond head plugs and put a cool air intake on it ) and check engine light was out for 3 days. Then came back on and codes said knock sensor and o2 sensor, but was still running great and then just died on me going down the road. Just wondering what I should look for. Don't know if upgrades did anything. Also just had a new fuel filter put on as well. It is a 1996 tahoe.

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New exhaust is to much for computer to figure out, since its flowing a lot more air , engine management cannot figure out fuel ratio hence the o2 sensor and knock sensor. u will have to install a performance chip or have computer re figured for new settings.

Posted on Apr 09, 2011

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My check engine light is on. it is pulling 4 codes P0302 P1670 P0174 P0171


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You stated that you replaced the O2 sensor but that is different to the HO2S sensor , does a different job and controls the air/fuel mixture from the ECM
because it has banks 1 and 2 it is a v engine and you will have a HO2S in the exhaust manifold or before the cat converter for each exhaust
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.Here's some reading about replacement catalytic converters and the law.Enjoy.

http://www.epa.gov/otaq/cert/factshts/catcvrts.pdf


Remember that cats are made up of precious metals inside-the cheaper ones are cheaper because they are use less of the expensive materials,and your check engine light WILL come on after a short period of time with a cheap cat.

Found direct fit cats,
http://www.thepartsbin.com/catalyti...l=751&year=2000

Alternate brand: Magnaflow 53004ca cats for the 2 upfront and used a 94006 for the center one just before the muffler.
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http://www.autoanything.com/exhausts-mufflers/Toyota/Tundra/111A50209A50522A0A17A94A1.aspx

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1 Answer

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Some systems actually depend upon a certain amount of restriction in order to work properly. The additional flow in the new system will mess with factory set flow expectations. If one of the O2 sensor wires have not been moved and have burned onto an exhaust pipe, You can either ignore the light if it's running well, or take the next (expensive) step and install a programmable engine control unit. However, in many states the light being on will cause you to fail inspection.
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