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Old 11 Jul 2011, 05:16 pm
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Default how can i bypass my o2 sensors 91 z28?

i have a 91 z28 with 34,000 miles on it. I recently upgraded the exhaust system and a few items on the motor (bolt ons). Here is what I did. I put the edelbrock aluminum tpi runners and intake manifold. Hooker headers 2210 titanium coated. all stainless steel straight pipe into the borla catback exhaust system. also i put new stock 22lbs injectors spark plugs and msd spark plug wires. Aluminum power pulleys. removed the air pump and o2 sensors. The problem is that i dont know how are if the motor can be tuned. If it cant what are my options with the o2 sensors. the motor starts fine but runs like crap until i get on it and then it runs pretty good. The best answer that I have received so far is that since the computer dosent have the o2 sensors it is blind and dosent know the proper air/fuel mixture and is guessing. Any advice will help and my goal is to get this car show ready as it won super chevy 82-92 street classback in 98. Havent showed are really drivin the car since but want to keep the stock motor and have it running and sounding good. Thanks
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Old 11 Jul 2011, 05:31 pm
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all fuel injection systems that have o2 sensors depend on that and airflow to determine proper air/fuelmix.

if the exhust doesnt have holes for the o2 you can take it to and exhust shop and they can weld in the o2 bung for you.

must cars need one precat and one postcat at measure the difference in the two readings.

an exhust gas analizer would be extremly helpful in this case
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Old 11 Jul 2011, 05:46 pm
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Get rid of the fuel injectors and put on a 4 barrel carb. A non-computer controlled device.
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Old 11 Jul 2011, 06:01 pm
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You have 2 choices. Put the oxygen sensors back on, or convert the car to carbureted.

Oxygen sensors will cost all of $50 to have bungs welded back on and have them reconnected.

Carburetor will cost you upwards of $1000 or more because you will need the carb, plus a carbureted fuel pump and regulator setup due to the much lower pressure fuel needs. If you want to keep it street legal, you only have 1 option, weld the bungs back on and reconnect the oxygen sensors. They are absolutely necessary, because the sensors tell the computer how much fuel to inject based on maps. Otherwise, the computer goes into a limp mode, which will cause the issue you're having.
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