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1999 Buick LeSabre Question: code po303...what would I expect the o2 sensor to read if an injector is leaking

 

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glenn sr, Sparks, NV, September 06, 2013, 15:49
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the reader picks up a po303 only after a long period of idling.the first o2 sensor reads .1 to .7.

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  • Answer #1

    September 06, 2013, 16:01
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    This code indicates a misfire on # 3 cylinder! Possible ignition fire, fuel injector or low compression. Forget about anything else until this is repaired!!

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    glenn sr, September 06, 2013, 16:56
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    new wires, plugs. ohms correct in wires...plugs gapped @ .065 haven't checked compression

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  • Answer #2

    September 06, 2013, 16:35
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    agree with pushrod

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    glenn sr, October 26, 2013, 12:21
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    here's where the problems stands...new spark plugs and wires. compression good, new coil, had a scan run and was assured that the injector was bad, replaced injector..PO303 still comes on at idle. I wiggled the wire at #3 injector and that seemed to work. I soldered in a new #3 injector plug in and wire. latest result is.....PO303

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