p0300 random misfire and p0451
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I use the "Rave". If you don't have it Google it, great resource to have on your laptop. It has a section called the "ETM" = Electrical Troubleshooting Manual and it has everything Rover electrical you can think of. Wire colors aren't always exactly as the manual, normal production anomalies of an automobile....
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Is this the PCV-oil separator?
And if it is plugged (which I suspect it is) would that have any link to the P1313 and P1314 codes mentioned earlier? I ask because those are the only misfire codes I still occasionally get - usually when climbing a hill at low speed or sometimes when coasting. Would a plugged PCV affect fuel mileage? Mine is still well below 10 MPG and I am replacing the 180 thermostat with a 192 today to see if higher running temps help fuel mileage.