Starting engine with no 02 sensors?
06-03-2009, 09:18 AM
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Starting engine with no 02 sensors? I have a project using an ls1 and the only thing left is the exhaust. I'm going to have to take it to an exhaust shop since I'm not the greatest welder but is it ok to temporarily start the car for a few secs with no 02 sensors? I don't want to foul the plugs since they are a bitch to reach in my car.
Thanks.
Thanks.
06-03-2009, 09:47 AM
#2
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When the motor is cold it does not use the O2 sensors (open loop operation). It uses a pre-programed set of assumptions to meter fuel to the motor.
I'd say you could probably plug the O2s into the harness just so the wires are hooked up and start it briefly. Without the O2s plugged in I'm not sure if it will throw a code, but if it did just clear it.
I'd say you could probably plug the O2s into the harness just so the wires are hooked up and start it briefly. Without the O2s plugged in I'm not sure if it will throw a code, but if it did just clear it.
06-03-2009, 07:32 PM
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06-04-2009, 01:18 PM
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So bad 02s trows the other sensors? because the dealer is telling me that i need to replace the 02s so that the computer wont read the nock, crank censors etc to read bad and that they charge me about $2000 to replace them lol wich im not going to do...but yeah i been driving my 01 5.7 TA like that for the past 2 months...
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06-04-2009, 02:33 PM
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So bad 02s trows the other sensors? because the dealer is telling me that i need to replace the 02s so that the computer wont read the nock, crank censors etc to read bad and that they charge me about $2000 to replace them lol wich im not going to do...but yeah i been driving my 01 5.7 TA like that for the past 2 months...
06-04-2009, 02:35 PM
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06-04-2009, 02:42 PM
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Wrong. I just read your other thread...
You should start by fixing the Crank Position Sensor. That tells your car where the pistons are in relation to top dead center. Without that info the spark curves fuel curves etc. will all have the wrong timing. Then you need to get your starter bolt issue fixed so the starter doesn't chip a tooth off your flexplate. Your car will probably run with the old O2 sensors.
You'll get more precise feedback on the other thread if you post up your actual DTC codes. All of them.
Good luck. I know how frustraiting that SES light can be.
You should start by fixing the Crank Position Sensor. That tells your car where the pistons are in relation to top dead center. Without that info the spark curves fuel curves etc. will all have the wrong timing. Then you need to get your starter bolt issue fixed so the starter doesn't chip a tooth off your flexplate. Your car will probably run with the old O2 sensors.
You'll get more precise feedback on the other thread if you post up your actual DTC codes. All of them.
Good luck. I know how frustraiting that SES light can be.
06-04-2009, 02:45 PM
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Wrong. I just read your other thread...
You should start by fixing the Crank Position Sensor. That tells your car where the pistons are in relation to top dead center. Without that info the spark curves fuel curves etc. will all have the wrong timing. Then you need to get your starter bolt issue fixed so the starter doesn't chip a tooth off your flexplate. Your car will probably run with the old O2 sensors.
You'll get more precise feedback on the other thread if you post up your actual DTC codes. All of them.
Good luck. I know how frustraiting that SES light can be.
You should start by fixing the Crank Position Sensor. That tells your car where the pistons are in relation to top dead center. Without that info the spark curves fuel curves etc. will all have the wrong timing. Then you need to get your starter bolt issue fixed so the starter doesn't chip a tooth off your flexplate. Your car will probably run with the old O2 sensors.
You'll get more precise feedback on the other thread if you post up your actual DTC codes. All of them.
Good luck. I know how frustraiting that SES light can be.
Last edited by Slow_ChevyTA; 06-04-2009 at 02:58 PM.