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I have a 1986 BMW K75C and I just replaced the spark plugs, coolant, oil, and put gas in it. The problem is, that it will now not start. I tried opening the choke, pulling the clutch lever, etc. It whines like its trying to start, but will never catch. It is kind of cold, about 55 degrees. The spark plug are the correct ones, with the cap on the end, and gapped correctly.
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check the basics first. Fuel pressure - there is a shrader (sp?) valve on the fuel rail on the engine where you can check that. Check if there is spark - pull on of the coils and put in a spark plug and crank. It can also be the ignition switch but check the two things above and then you will know where to look for the problem
try new spark plug or check that you have not put to much oil in clean where spark plug gos all so if you have to keep chageing the batarry you may of over cooked it
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.
I'd personally start by checking the basic ignition components; spark plugs, spark plug wires, distributor cap and rotor. If any of these items are damaged, worn or just no longer up to specification then they're likely to be the culprit. Mine just went through a spate of stalling and wouldn't restart because the wires were no longer insulating properly...weak spark, wouldn't ignite the fuel.
Let us know if this helps, and if not try to provide some more detail regarding the conditions when this is occuring.
i have had the same problem at times. my car would start and then shut off. but i found that i needed oil and check my oil and it was a quater low put in some oil and everything went fine i notices that everytime the oil is low the same thing happens also depending on the position of the car being park meaning that if you are in a down hill position or up hill position i will do the same. so you have to accelarate for 1 minute to have the oil go up. i hope this works
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