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V70 misfiring on #1 V70-XC70 1999

posted by  the toner on  Sat Sep 19 08:21 CST 2009
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last visit: Fri Dec 11 05:14 CST 2009
[RELATED]

One of my Volvos is giving me real grief right now, and I'd appreciate some advice. It started to misfire on the freeway last weekend and is throwing code 301 plus my sensor is flashing the following icons: EV OH C O.
I have replaced the #1 coil and the plug to no avail. As a further step in trying to diagnose this problem I am considering starting the engine with the #1 coil unplugged to see if I can detect power going to the plug in, and then doing the same with #2 for comparison. Might doing so damage ECU? Does anyone have any other suggestion? I am also considering interchanging the injectors to see if that moves the problem around, as well as a compression test.
Thanks,





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