Alex V. Posted August 11, 2012 Posted August 11, 2012 What procedures are necessary to troubleshoot the oxygen sensor on an '84 XJ with the feedback carbureted 2.5L?
Pete M Posted August 11, 2012 Posted August 11, 2012 hmmm... I wasn't aware they had one in 84. :dunno:
Alex V. Posted August 11, 2012 Author Posted August 11, 2012 Yup, it's a 1-wire deal in the exhaust manifold, and my guess is it inputs to the computer which controls a solenoid on the side of the carb.
Pete M Posted August 11, 2012 Posted August 11, 2012 oh that's right. :doh: the computer carbs. guess I did know that. :rotf:
jimoshel Posted August 16, 2012 Posted August 16, 2012 You need a digital meter. A analog won't hack it. With the engine off back probe the O2sensor lead. Turn the key on. Meter should read .45volts. Here I've noticed sometimes it will and sometimes it won't. Start engine. after engine has warmed up the voltage should vary between .2 and .75 volts, It is necessary to rev the engine several times while checking voltage. Just idling won't get it.
Alex V. Posted August 18, 2012 Author Posted August 18, 2012 Thanks, jimoshel. I have a digital multimeter, and I'll go through that procedure when I can get the time.
mountainman Posted August 18, 2012 Posted August 18, 2012 a new one on rockauto is 12 bucks....lol. If its old... just put a new one in. Bet you can get one at your local parts house for less than 20. :)
Alex V. Posted October 22, 2012 Author Posted October 22, 2012 Okay, finally got a chance to check the reading from the 02 sensor, and here's what I came up with. All readings are taken with the digital multimeter grounded to the battery terminal, positive probe contacting the harness side of the plug (not the sensor side of the plug) with everything hooked up/plugged in. Engine off, key on: .09V Engine idling: .90V Engine held around 2,000-2,200 RPM?: Slowly falls from .90V to .50V or less. Verdict?
ftpiercecracker1 Posted October 22, 2012 Posted October 22, 2012 electronic carb? I bet thats about as fun as a barrel of monkeys.
Alex V. Posted October 22, 2012 Author Posted October 22, 2012 Carter YFA, if I'm not mistaken; it's some variation of a YF. Oh, yeah - reading the O2's output is the first thing I've done on it. I'm just optomistic that a new sensor will fix it, and I won't have to dive into the maze of wires and vacuum lines surrounding the carb. :D
Dookie Posted October 23, 2012 Posted October 23, 2012 electronic carb? I bet thats about as fun as a barrel of monkeys. haha
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