took the cat off runs like crap Please help!

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took the cat off runs like crap Please help! - 5/25/2006 9:10:59 PM    yamaha   Posts: 3 Joined: 5/25/2006 Status: offline I took off the cat. and the check engine light came on and it ran, but not as it's usual self. dose it have to have the cat on it or is there anyway to bypass it & make it run right agin? Thanks! yamaha Post #: 1

RE: took the cat off runs like crap Please help! - 5/25/2006 9:12:07 PM    yamaha   Posts: 3 Joined: 5/25/2006 Status: offline by the way it is A "99" 4x4 blazer (in reply to yamaha) Post #: 2

RE: took the cat off runs like crap Please help! - 5/26/2006 12:26:55 AM    KiddBlazer1983   Posts: 9 Joined: 5/24/2006 Status: offline yamaha f im not mistaken autozone or any parts store usually sells what are called dummy o2 sensors because the sensors do need to be hooked up or it will run like crap the dummy ones dont really hook up to nothing but will fool the computer. My friend had the same problem. Let me know if this helps _____________________________ Proud owner of a 2000 blazer 4door white 4x4 http://www.danasoft.com/sig/YOURFIRED.jpg (in reply to yamaha) Post #: 3

RE: took the cat off runs like crap Please help! - 5/26/2006 5:36:13 AM    swartlkk Posts: 14299 Joined: 5/1/2005 From: Waterloo, NY Status: offline The down stream sensor has nothing to do with fuel delivery. That is most likely the reason for your check engine light however. The running "not as its usual self" is probably because of the lack of back pressure that you now have in the exhaust system due to the absence of the cat. If you don't have the rest of the engine setup for the higher flow of the exhaust, you are going to have performance issues. And by setup, at the very least, a different cam to move the power band up in the rpm would make it much better. May I ask why you removed your catalytic convertor? Aftermarket cats aren't really all that expensive... Plus there is a federal law mandating that all emissions equipment be on a vehicle. You could be charged a fine if you were to be found with out your cat. _____________________________ Kyle- 2004 Rainier 1970 Chevelle - Resto 1974 K5 Blazer - Resto (in reply to KiddBlazer1983) Post #: 4

RE: took the cat off runs like crap Please help! - 5/26/2006 8:46:09 AM    cherryred4x4 Posts: 382 Joined: 1/20/2006 From: Raleigh, NC Status: offline Taking the cat off is a pretty big fine too. If youre trying to make your exhaust less restrictive, get a freer flowing muffler, dont take the cat off. The stock muffler is absolutely huge. If you really really want no restriction, put a section pipe in place of the muffler, but leave the cat. _____________________________ Adam -Virginia Tech '08 - Building Construction 2006 GMC Canyon Crew Cab Z71 4x4---New--- 1995 Cherry Red 4WD 4-Door, 4.3 "W" GU6---Traded 7/7/07--- (in reply to swartlkk) Post #: 5

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