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#1 (permalink) Old 03-30-2013, 12:42 PM
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Z3 Fuel

I recently purchased a 1997 Z3, 1.9L and the previous owner said he has used regular unleaded gasoline since he owned it the past 10 years. Everything I've read suggests premium fuel is required for the z3. The engine is running great and the fuel mileage is outstanding, 27 - 30 mpg. Is there a hidden risk with running the lower octane regular unleaded instead of premium fuel?
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#2 (permalink) Old 03-31-2013, 10:53 AM
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Overtime the computer will adapt for the lower octane gas. BMW mandated 89 octane at the very least because of the compression ratio (10:1) and because lower octane will ruin the Catalytic Converts faster. Dont be suprised if they fail soon, as poor quality gas is a common reason for premature failure.


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#3 (permalink) Old 06-15-2013, 04:06 PM
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Quote:
Originally Posted by BBrinley View Post
I recently purchased a 1997 Z3, 1.9L and the previous owner said he has used regular unleaded gasoline since he owned it the past 10 years. Everything I've read suggests premium fuel is required for the z3. The engine is running great and the fuel mileage is outstanding, 27 - 30 mpg. Is there a hidden risk with running the lower octane regular unleaded instead of premium fuel?
The previous owner was either ignorant of the fuel requirement or was simply a skin flint. Makes me wonder what else he/she skimped on.

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#4 (permalink) Old 01-15-2014, 08:12 AM
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Why is this Z3 Roadster misfiring?

BMW 1999 Z3 Roadster 2.8, misfiring on cylinder 4,5,6, and also random misfire. Have changed 3 out of 4 lambda sensors, changed all the spark plugs, even tried clearing the faults from the memory and swapping ignition coils 1,2,3, for 4,5,6. The MIL light does not come on but the codes came back as misfire on 4,5, and 6. It is running ok untill the engine gets warm and you try to boot it then you get the most awful misfire and a complete lack of power. There is also a strong smell of petrol sometimes. Could you help please its driving me crazy!!!!#post165366
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#5 (permalink) Old 01-15-2014, 09:28 AM
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Have you had the trouble codes pulled? If you swapped the plugs, try swapping the coil packs. If the misfire follows the coil packs then those are bad. If the misfire persists after swapping around the coil packs then look at your O2 sensors. A failed sensor has been known to cause misfire issues.


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