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Old 11-17-2005, 01:37 PM
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O2 Sensor?

ok... a 90 2.2L Chevy. the idle comes way up then it comes down very slow on startup and every once in a while the engine stalls. the check engine light come on rarely and only stays on for a minute or 2 then goes out. i checked the plugs and they were WHITE. really bright white. which tells me its leaning out WAY too much. my question is... would a bad O2 sensor cause the irradic idle? it has a new TPS, IAC, EGR valve, and crank position sensor. i bought brand new plugs and put in it yesterday. and it has new plug wires and i checked the ignition system and all that is good. about the only thing left is the O2 sensor but thats been changed about 6 months ago and i know that sometimes they dont last very long. thanks for the help guys, i appreciate it...

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Old 11-17-2005, 02:15 PM
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  • First of all, the O2 sensor isn't even being read by the computer until the engine is fully warmed up and after a certain period of time, so I doubt it is the problem.
  • Could also be a bad coolant temp sensor OR THE WATER LEVEL IS VERY LOW. CHECK THIS FIRST!
  • Check for a vacuum leak in the manifold or throttle body area which will cause a high idle.
  • You could also have a bad electtrical connection in the IAC motor wiring, causing intermittant idle speeds.
  • Could also be a sticking throttle cable.
Let us know what the fix is.
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Old 11-17-2005, 09:39 PM
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pertaining to the O2 sensor....

even if the O2 sensor voltage is fluctuating extremely, like going up all the way and dropping below operating voltage?
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