As said, get stuck in to it, it will cost nothing to whip the engine out and have a look whats wrong, motorsport can be an expensive pain but when it goes right it makes up for it in a huge way.
look at me for example win round 2 of the championship.. round 3 wreck a gearbox in qualifying, spin and destroy my front bumper then have a water leak and retire in race 1, race 2 finish well happy in 6th out of 31 with another wrecked gearbox!
It's all ups and downs! lol

steve