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Old 01-02-2003, 08:14 PM
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Join Date: Dec 2002
Posts: 305
Lamda experts.. Pin 3 to ground duty cycle +- 97% what now??

The duty cycle is 97%.. I can adjust the tower, but it does not change.. It also does not change when I rev it up..Any ideas where to go from here?? I would love to fix it myself, but I hate to keep driving it with it running this rich..

I saw a 10% number flash for a moment, but it may have been a breif bad connection...


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Old 01-02-2003, 08:21 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Try unplugging the O2 sensor and see what it goes to. IF it is fixed at 50%, you have a bad O2
Donnie Drummonds
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Old 01-02-2003, 09:10 PM
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Join Date: Dec 2002
Posts: 305
I have a new O2 sensor, however it wasn't specifically made for my car(that doesn't mean it's good)..I bought a sensor for a 90 302 Mustang.. The connector was already missing, as somone before me had hardwired one in already.. I don't know why they cut the wires before the connector..

There are two whites, and a black wire.. I know that the two whites are for the heater, and the black is signal..

Should both white wires be +12V?? With the ignition on, or is one of them ground.. I want to make sure the wires are actually OK too???
I won't get a chance to do any further testing until Saturday morning.

I'm pretty sure I can fix this if I can collect enough info. At some point, time becomes a factor though..
I've got until Sunday to fix it.. Then it goes in the shop, I bite the bullet, and get on with my life..

Thanks for the help

Last edited by jay3000; 01-02-2003 at 09:16 PM.
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