By mistake I add regular gasoline to my BMW 5 series. Week later I
star the engine, and I hear a knock from the engine and lost of power
was evident, to the point that the car ALMOST STOP WORKING !........I
add premiun gas and the problem persist: lost of power and a
runn,,,runnn...runmnn.... The engine sounds like it s working hard to
I am not using the car, but I wonder if is the Gas?
show room condition
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Re: BMW SERIES 5- LOST POWER
One tank of regular shouldn't result in what u describe. No engine service/warning light came on (I assume no, or u would have mentioned it). The knock noise from the engine--do u still hear it, or was it just the one time? Too low an octane could result in engine 'ping' or knocking when accelerating. I would change the fuel filter, and scan for any codes stored in the computer, and take it from there. I think u are wise not to drive it until you know more about what is going on. Let me know what u find.
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If you can catch it failing again, test for power on the small wire going to the starter solenoid while someone tries to crank it. If you have no power, check for power at starter relay and trace backwards. If you have power, you have a bad starter. They can have intermittent failures. Hopefully your starter is easy to access, some 3 series and 5 series have the starter mounted under the intake manifold and it is necessary to removed the maifold to replace or test the starter. Good luck, hope this helps.
1 Listen for unusual sounds when you try to start the car. No sounds indicates a problem with the ignition. If you hear a clicking sound, the starter is faulty. If the car starts for a moment then shuts off, you may hear a knocking noise. This can be from a faulty fuel injector or the individual components of the system, such as the fuel filter, fuel pump or hoses. 2 Check the fluid levels in your BMW. Little or no fluid can cause your engine to seize up and not be able to start. It can also cause more severe engine damage if it goes on for too long. Checking your fluids can also alert you to any leaks within the engine. Some drivers have reported leaks in the cooling system that can cause overheating problems. There have also been reports of power steering hoses failing and leaking. By checking your coolant and power steering fluid, you can diagnose if they are the problem. 4 Add gas to your tank. Although the BMW 540i has a gas gauge that indicates the fuel level, in some cases the gauge may be faulty. After adding fuel, attempt to start the car again. 5 Note any smells that may be coming from the engine. When your engine was still running, you may have noticed odors, such as a burning or oil smell. This would indicate that the engine is leaking, and fluid is burning off in the engine. Some owners on Repair Pal have reported complaints with the 540i that the valve cover, intake manifold and PCV plate leak oil after 60,000 miles.
One of two things I think, if you are using low octane "Regular" gas in this can and it says it requires premium, the car could be retarding the timing which could cause a knock on idle.
you could also check the compression for a loose valve that could be causing the knock, otherwise you might have a bent rod, which it sounds like you might. The kock will get progressively worse until you fry your engine and have to buy a new one. Good Luck. Talk to a mechanic.
1. You need an oil filter made for your year and model of bmw. 2. The 540 is the 8cyl version vs the 528 is the 6cyl version 3. yes, you can go back and forth from regular to synthetic oil with no problems