Ford windsor 351, pertronix ignition off negative coil, MS-II V3 2.86 code. Relay board.
Our engine runs but I'm not getting a reading on the o2 sensor (narrowband). It "used to" show a signal on MT, but no more. Shouldn't there be a 5v output from the MS and through the relay board? I checked with a meter while the engine was running and didn't get a reading. I checked for continuity throughout the relay board and MS (even checked some of the components in the circuit which seem to be ok). It works on the Stim, but not on the engine. Any ideas where to go from here? I followed the schematics back to the o2 circuit. It looks like the processor puts out the necessary 5 volts in order for the circuit to operate? The o2 sensor I'm using had worked on a previous project, but before I spend another $20 on a new sensor, I would like to figure out what kind of output I should expect and test for it. Thanks.
What is o2 sensor output from MS?
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
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What is o2 sensor output from MS?
1962 Buick Skylark 215 V8
Bored and stroked to 266, Port Injection, Pertronix ignition AEM WB 02
1977 28' Mercruiser 351Windsor, TBI, Pertronix ignition, NB o2
Both MS-II 2.891 , V-3 board
Bored and stroked to 266, Port Injection, Pertronix ignition AEM WB 02
1977 28' Mercruiser 351Windsor, TBI, Pertronix ignition, NB o2
Both MS-II 2.891 , V-3 board
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Matt Cramer
- Super Squirter
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Re: What is o2 sensor output from MS?
The O2 circuit is an input, not an output. If you're not getting any volts on it, it's likely an issue with the sensor.
Re: What is o2 sensor output from MS?
Of course! (as I slap myself in the head) I was mistaken and thought it had worked off of resistance through the sensor. oops. Thanks for clarifying matt.
1962 Buick Skylark 215 V8
Bored and stroked to 266, Port Injection, Pertronix ignition AEM WB 02
1977 28' Mercruiser 351Windsor, TBI, Pertronix ignition, NB o2
Both MS-II 2.891 , V-3 board
Bored and stroked to 266, Port Injection, Pertronix ignition AEM WB 02
1977 28' Mercruiser 351Windsor, TBI, Pertronix ignition, NB o2
Both MS-II 2.891 , V-3 board