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

the reader picks up a po303 only after a long period of idling.the first o2 sensor reads .1 to .7.

by in Sparks, NV on September 06, 2013
2 answers 2 comments
ANSWER by on September 06, 2013
This code indicates a misfire on # 3 cylinder! Possible ignition fire, fuel injector or low compression. Forget about anything else until this is repaired!!
COMMENT by on September 06, 2013
new wires, plugs. ohms correct in wires...plugs gapped @ .065 haven't checked compression
ANSWER by on September 06, 2013
agree with pushrod
COMMENT by on October 26, 2013
here's where the problems 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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