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exhaust problem

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Old May 23, 2013 | 05:43 PM
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Default exhaust problem

I have a 1994 c4, I just replaced the original exhaust with a muffler eliminator from cat back. Now when she gets up to temp. it starts to spit and sputter@ 2000 rpms and up. And it's not spitting a code. Has anyone eles run into this problem?and what do I have to do too fix it?? Thanks.

Last edited by chip LT1; May 23, 2013 at 06:01 PM.
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Old May 23, 2013 | 07:19 PM
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Default Exhaust LT1

You have another problem than the exhaust I think. I have the exhaust eliminators on my 84 and My 96. No problems. the 84 been on for 10 years and the 96 1 yr. Check some where else. Maybe ignition did you do anything else to the car ??
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Old May 23, 2013 | 07:28 PM
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I did nothing but change the exhaust
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Old May 23, 2013 | 07:59 PM
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Got me if that was all you did may have touched the sensor on the exhaust while under there.Sounds like could be starving for fuel. While back there may have touched the fuel line. Just a thought??
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Old May 23, 2013 | 08:01 PM
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thanks for the info. when it's cold it runs great
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Old May 23, 2013 | 08:14 PM
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Sorry high jack here, how does the exhaust sound, any droning.

Check your fuel presure, also regulator. Do not have any exp with the optispark yet. Good luck.
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Old May 23, 2013 | 08:15 PM
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It sounds like you fubared your O2 sensor or there is a bad connection. Did you mess with them at all. When cold your car runs of a table. When hot it is in closed loop and runs of the sensors.
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Old May 23, 2013 | 08:42 PM
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Originally Posted by roadcaqpt
Sorry high jack here, how does the exhaust sound, any droning.

Check your fuel presure, also regulator. Do not have any exp with the optispark yet. Good luck.
Mine sounds great. Get a little poping when I let off. Inside is not bad from the ouside taking off awsome At highway speeds 60 70 in 6th gear NICE running about 1200 RPMs
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Old May 24, 2013 | 02:39 AM
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Originally Posted by ch@0s
It sounds like you fubared your O2 sensor or there is a bad connection. Did you mess with them at all. When cold your car runs of a table. When hot it is in closed loop and runs of the sensors.
This would be my first guess as well. Although, I would think you would get a code, but hard to say. You also have some ground wires in that area as well. Also, when you say "cat back", I am assuming the cats are still there.

First get under there and make sure all your O2 sensor connectors are plugged in tight, and make sure the braided ground from the frame to the bellhousing is undamaged.
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Old May 24, 2013 | 02:49 AM
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Check :::


1-fuel pressure
2-o2 sensors
3-pull codes , you might have a code
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