Leaderboard

Welcome to the forum. How many miles has the car done and does it use much oil between services, possibly indicating worn valve guides and piston rings that could lead to excessive pressurisation of the cam cover ? A few thoughts; - was the replacement cap the correct one. - are the pegs in place that the filler cap tightens up against. - does the cap feel tight when it has been rotated in place and does it have the O-ring seal. - the battery light is probably from the oil leaked onto the alternator, hopefully this will clean off and not result in damage. - leave the engine cover off for now if you think this has caused the filler cap to rotate loose. - the loss of power may be due to a sudden air flow in/out of the cam cover when the filler cap came off which would not be measured by the air flow meter. - check the breather hose and connections between the cam cover and the air inlet piping are not blocked.

couple of things check the plastic rocker cover where the cap screws in to make sure that its not broke. If thats ok then id be checking for back pressure on the engine