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There are some safeguards which diagnose rich fuel conditions. If you have a hybrid which has a start-stop feature, this may be a reason for the smell.
Have someone check underneath the car for fuel line leaks just in case. If the system is running rich, a warning will appear. Sometimes old gas will make the exhaust smell stronger and if you used the E85 there will be more odor.
Getting water in the tail pipe is a good sign as the engine will always have moisture when not running. Water on spark plugs is a bad sign as there may be a leak from a cracked cylinder head which is then a major job, the car should be running erratically or will stop.
To check if this is the case take out the oil dipstick and see if the oil is light brown instead of black then you have a problem as mentioned so needs major overall to the engine.
Coolant temperture sensor. Look at the front of the cylinder head. There will be a square 3 pin connector. This should be the one you need to replace. What happens is that it is stuck telling the computer that the coolant is cold thus providing more fuel to start. Once the system is warm this excess fuel is not needed and can create the black (raw fuel) smoke that is coming from the tail pipe once warm. This is a very simple repair. Let me know if you need anything else.
check the spark plug wires are attached all the way till it snaps, pull each spark plugs, any black deposits on any plug means it isn't firing(faulty plug,or wire) last of all take off each injector wire and notice if there is a change in idle speed (plugged injector)
Need a CRANK SENSOR its located on the side of the crankshaft. This provides spark reference for this vehicle obviously you are getting gad and NO spark beci=ause the car floods. Good Luck contact if you need more help. for parks check Bavarian auto or BMW or a Bosch retailer all good parts. Good Luckcontact if you need more help, thanks or using FIX YA
You need to have your engine flushed and cleaned out. One or more of your spark plugs aint firing. You need to replace them all to include the wires as well. If you dont get your engine flushed, you could blow your engine up.
check intake manifold for leaks and also inspect all vacuum hoses also may be good idea to replace opti spark ignition module its located on the coil mounting bracket at front of right cylinder head if its been exposed to water , antifreeze, or moisture it can effect ur cars timing