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Re: BMW 528I smokes on start up
Telemachas is totally correct with this type of car,also when pulling one of these engines apart i also found a lot of wear on the piston ring groves ,although rings were good the pistons themselves needed renewing .This would cause oil to be pumped into combustion chambers on initial start up.Problem was the cost of parts was more than the car was worth so customer bought another car as this one had been inported from germany and was so rusty as well it was just a scrapper and worst of all it had no air con
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Smoking at startup can be one of two things....water or oil.
Moisture buildup in the muffler will show up as white smoke on startup, usually more noticeable on cooler mornings than on warm days. Blue smoke on startup is usually caused by small amounts of oil that leak past the valve seals as they get older, worn, and dry out. This is not usually a major issue unless and until it gets to the point of causing oil-fouling of the spark plug(s). Then you must either repair the problem or be prepared to clean your spark plug(s) periodically if the engine starts to display a noticeable misfiring.
Feb 22, 2012 - Uploaded by willnbren2
I have a question regarding my 98 528i , it will crank once but not start then I retry it won't crank but I can hear the fuel pump humming , I have to ...
Smoke is not a good sign. Running rough is not a good sign. Oil light not a good sign. You could have a combination of bad things, most likely expensive. Suggest professional help. Smoke can be bad rings or holed piston. Low oil pressure can be bad bearing or oil pump.
I have seen this on old cars, my suspicion is that the seals on the valves are a bit worn. This allows some oil to get through during start up. Since it quits smoking, I would not be overly concerned. However, since it burns a quart every 1-2K miles, I am curious what the compression is. My Fiero does the same thing (occasional puff of smoke on start up) but does not need oil between 3,000 mile chages. It is a 2.5 liter. Here is nice tip: check compression on all cylinders, then recheck it adding a teaspoon of 2 cycle oil to the cylinders (one cylinder at a time). Some have said to use conventional oil for this, due to higher viscosity, but I always thought it might foul the spark plugs. If the compression goes up, it is ring wear, if not it is leaking through the valves.
A tune-up and throttle body clean-up is a good idea, but mind you on those cars, the valve covers usually leak into the spark plugs and coils, causing the car to misfire. If you are replacing the plugs and find them soaked in oil; replace your valve cover gaskets or you will be back to the same problem soon after the oil soaks the new plugs back up again.
If your talking about what would a dealership change, it generally consists of a tune up, including spark plugs, plug wires, air filter, oil change, pcv valve, and fuel filter. Thats also usually when they want to replace the timing belts. There may be one or two other things specific to BMW, but generally thats what you can expect.