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2007 S40 Throwing P0300 code after head gasket change

Help, Advice, Owners' Discussion and DIY Tutorials devoted to the second generation C70, S40 and V50 Volvos -- awkwardly model year 2004 ½ onwards -- plus where to go for advice and discussion on Volvo's sporty C30 Coupe powered by Volvo's ubiquitous inline 5-cylinder power plant.
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Craigd2599
Posts: 419
Joined: 10 January 2009
Year and Model: 2007 S40.
Location: Lynchburg VA
Has thanked: 3 times

2007 S40 Throwing P0300 code after head gasket change

Post by Craigd2599 »

Still working the bugs out after the head gasket change.
I got the car back together, found a few more coolant leaks, fixed them. The thing starts and runs perfectly. But will not idle after initial start. Good power, no white smoke, no codes. Then it will start rough idle and die, triggering a P0300- multiple misfire. Is it possible that the two cylinders that had coolant in them damaged the spark plugs? I was thinking maybe the plugs contacting coolant would repeatedly quench them and cause failure.
But it runs so smoothly that it seems unlikely. Also...the off-idle spark advance is 32 degrees. This seems high to me. Is it too high and does this have anything to do with the misfires? Does this mean I have the VVT wrong?
Craig D
Philly Boy in Lynchburg VA
2007 S40 Previously: 2 850's and an S80
Waiting for that "R" model barn find
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