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Should a 7730 ECM run w/o an O2 input?

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Old May 12, 2002 | 10:01 PM
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92RSB4C's Avatar
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From: Friendswood(Houston),Texas,USA
Should a 7730 ECM run w/o an O2 input?

The car just died on the freeway like I turned it off or something. I've had troubles with it before and it is doing the exact same thing. Also, with the O2 sensor disconnected, what should the voltage from the ECM be? W/o an O2 reading, the car wont even start, not even when it's cold and in open loop.
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Old May 13, 2002 | 07:47 AM
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From: Pasadena, MD
Car: '87 Camaro IROC-Z
Engine: 385 HSR
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: Should a 7730 ECM run w/o an O2 input?

Originally posted by 92RSB4C
The car just died on the freeway like I turned it off or something. I've had troubles with it before and it is doing the exact same thing. Also, with the O2 sensor disconnected, what should the voltage from the ECM be? W/o an O2 reading, the car wont even start, not even when it's cold and in open loop.
The O2 sensor puts out a voltage of 451 mV until it has warmed up. If the car just died and it won't start, I'd look at something else other than the O2 sensor. Check your fuses carefully.
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Old May 13, 2002 | 10:53 AM
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From: Friendswood(Houston),Texas,USA
Re: Re: Should a 7730 ECM run w/o an O2 input?

Originally posted by GregWestphal
Check your fuses carefully.
Exactly what fuses are you talking about?
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Old May 13, 2002 | 01:51 PM
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From: Pasadena, MD
Car: '87 Camaro IROC-Z
Engine: 385 HSR
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: Re: Re: Should a 7730 ECM run w/o an O2 input?

Originally posted by 92RSB4C


Exactly what fuses are you talking about?
The ECM and injector fuses.
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