Any Thoughts???
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Teching In
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Any Thoughts??? Hey there, just recently got myself into a 2000 Z28 camaro LS1. Just replaced the alternator, fuel pump, and ps pump. But now I have a SES light for the o2 sensors bank 1 and 2. I've been reading that it could be caused from an Intake manifold vacuum leak. Any thoughts? At idle it usually drops to a rough 500 range RPM idle. And i can also hear a hissing sound from the top end of the engine.
Been a bit of a headache, love any help i can get!
Been a bit of a headache, love any help i can get!
Hissing sound might be AIR pump related. This could also cause problems with the front O2 sensor readings. The idle would also be affected due to vacuum leak since the AIR system pulls vacuum from the intake manifold.
I would just trace those AIR lines to see if you may have left something loose or unplugged.
I would just trace those AIR lines to see if you may have left something loose or unplugged.
Thread Starter
Teching In
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Hissing sound might be AIR pump related. This could also cause problems with the front O2 sensor readings. The idle would also be affected due to vacuum leak since the AIR system pulls vacuum from the intake manifold.
I would just trace those AIR lines to see if you may have left something loose or unplugged.
I would just trace those AIR lines to see if you may have left something loose or unplugged.
I pulled the fuse for the air pump and i can still hear it. it doesnt sound so much as a hissing. Im not really sure how to explain it but i pulled the pump fuse and still can hear it and the car still is running funny. Is that not a good way to look for the leak or is that showing me that it isnt the air pump?
those codes all point to bank 1, mostly the upstream o2 sensor is not working.
being car is over 10 years old, and you didn't say how many miles on it or what it's past history is or if it's been modded... i would buy 2 new o2 sensors from rockauto. the upstream pre-cat o2's. those are the ones that matter and will greatly affect engine performance and fuel mileage. also check the wiring going to those upstream o2 sensors and make sure the connectors are in good condition and none of the wiring is chaffed, if it is then look at getting replacement connector and/or repair wiring.
being car is over 10 years old, and you didn't say how many miles on it or what it's past history is or if it's been modded... i would buy 2 new o2 sensors from rockauto. the upstream pre-cat o2's. those are the ones that matter and will greatly affect engine performance and fuel mileage. also check the wiring going to those upstream o2 sensors and make sure the connectors are in good condition and none of the wiring is chaffed, if it is then look at getting replacement connector and/or repair wiring.
Thread Starter
Teching In
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those codes all point to bank 1, mostly the upstream o2 sensor is not working.
being car is over 10 years old, and you didn't say how many miles on it or what it's past history is or if it's been modded... i would buy 2 new o2 sensors from rockauto. the upstream pre-cat o2's. those are the ones that matter and will greatly affect engine performance and fuel mileage. also check the wiring going to those upstream o2 sensors and make sure the connectors are in good condition and none of the wiring is chaffed, if it is then look at getting replacement connector and/or repair wiring.
being car is over 10 years old, and you didn't say how many miles on it or what it's past history is or if it's been modded... i would buy 2 new o2 sensors from rockauto. the upstream pre-cat o2's. those are the ones that matter and will greatly affect engine performance and fuel mileage. also check the wiring going to those upstream o2 sensors and make sure the connectors are in good condition and none of the wiring is chaffed, if it is then look at getting replacement connector and/or repair wiring.
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Thread Starter
Teching In
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those codes all point to bank 1, mostly the upstream o2 sensor is not working.
being car is over 10 years old, and you didn't say how many miles on it or what it's past history is or if it's been modded... i would buy 2 new o2 sensors from rockauto. the upstream pre-cat o2's. those are the ones that matter and will greatly affect engine performance and fuel mileage. also check the wiring going to those upstream o2 sensors and make sure the connectors are in good condition and none of the wiring is chaffed, if it is then look at getting replacement connector and/or repair wiring.
being car is over 10 years old, and you didn't say how many miles on it or what it's past history is or if it's been modded... i would buy 2 new o2 sensors from rockauto. the upstream pre-cat o2's. those are the ones that matter and will greatly affect engine performance and fuel mileage. also check the wiring going to those upstream o2 sensors and make sure the connectors are in good condition and none of the wiring is chaffed, if it is then look at getting replacement connector and/or repair wiring.
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My car showed front O2 codes when the AIR check valves needed replaced. Just another option to check on before spending the money on O2 sensors.
I prefer sticking with OE, FWIW; ACDelco 213-810 if you ever plan on headers.
I prefer sticking with OE, FWIW; ACDelco 213-810 if you ever plan on headers.
Thread Starter
Teching In
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I just find it weird that I pulled the fuse on the air pump and I'm still hearing it. I have a feeling it's the intake still.
Thread Starter
Teching In
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Quick update: changed the mani gaskets as I said, lost time and ambition to hit the valve covers. Runs a lot better, but once and a while still drops rpms a little. And ses still on. Tomorrow plan to do an egr/ air pump delete. And putting an slp air lid on and cutting the box for ram air