316i coolant and engine problems
My first BMW. I have bought a 96 bmw 316i (m43) which has two (maybe the same problem). The first problem. The coolant system seems to be presurising over the normal level. All hoses are hard. I have renewed fluid, the themostat, the plastic pipe on the back of the cylinder head, checked the water pump which was ok (metal impellor type) and back flushed the whole system and bleed correctly. The rad seems to be in an ok condition with no obstructions and has good flow. There is no white scum in the oil, no coolant loss, and compresion test reveiled nothing out of the ordinary. I don´t think head gasket has gone or is at fault.
The second problem, the car is next to impossible to start. The starter goes perfect, engine turns but ís hard to start. It seems to all most fire up but not quite. Once it does start the engine goes perfect. No smoke, no Power lose and no eratic idling, just drive. If i turn the engine off it the same story, very hard to start agian. I does not matter if the engine is cold or hot. I have checked to see if it is getting fuel, which it is. Renewed all spark plugs and changed the fuel and air filters. I have checked the spark plug leads, no problem there its getting a good spark. Can this be a cam or crank sensor problem? or maybe a knock sensor or air flow sensor? Grateful for any insight anybody has.