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Old Aug 21, 2007 | 07:13 AM
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ok i have a 1998 z, i have changed plugs, o2, fule filter, and it is still poping and the check eng. light is still on saying o2 and they are brand new what is wrong with this car dont know what else to do with it
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Old Aug 21, 2007 | 08:47 AM
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still have cats? what mods?
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Old Aug 21, 2007 | 09:01 AM
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When does it make the popping noise and where is it coming from?
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Old Aug 21, 2007 | 09:04 AM
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Originally Posted by geeteego
still have cats? what mods?
x2 Give us the exact code the SES light is giving and we can help you out.
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Old Aug 21, 2007 | 09:42 AM
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ported heads, cam full exaust, no cats underdrive pully, no codes are showing up.
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Old Aug 21, 2007 | 09:46 AM
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has it been dyno tuned with a wideband?
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Old Aug 21, 2007 | 09:59 AM
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has been, but all of a sudden it started to act up and had it scaned and said o2 so new o2 with a tune up and the other day new fule filter and it is still acting up and poping in the exaust pipe
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Old Aug 21, 2007 | 04:47 PM
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anything
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Old Aug 21, 2007 | 04:59 PM
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Do you still have egr/air?
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Old Aug 21, 2007 | 09:44 PM
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Check your diverter valves GM calls them one way check valves , check if there plugged or letting exhaust into the air system there is one in eack bank. You should only be able to blow air in one direction only.There the ones that look like huge diaphrams. Other than that it could be a rocker arm. Is the car running rich?
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Old Aug 21, 2007 | 10:52 PM
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check for any exhaust leaks upstream or in between the Os sensors and the engine. all it takes is a small leak and it will cause the O2 to read completely off because the leak will let oxygen into the exhaust.
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Old Aug 23, 2007 | 07:19 AM
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Moving to General Maintenance & Repairs....
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