Question about 2003 BMW M3
I have a the code 3f31 as above, I have swapped relays over, checked the fuel pump fuse and others, changed the fuel rail sensor, unplugged the battery and reset through the ignition, plugged the diagnostic machine in and cleared it the fualt keeps coming back! the car is not running right, the turbo boosts at wrong intervals?
not sure whats up wiv it any suggestions?
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Posted on Jan 02, 2017
Check for clogged air filter, an obstruction or leak in the duct that joins the turbo unit outlet to the intake manifold.An intake manifold gasket leak, a leak or obstruction in the exhaust system or a waste-gate problem.
The vacuum line is either blocked or there is vacuum leak .Also get the fuel pump and spark plugs checked.------
---Also other possibility is compressor surge.The turbo is spooling up too fast and sending too much air into the engine for it to take. You can fix it with a larger A/R exhaust housing. You can also fix it with a surge-ported compressor housing.It is not your blow off valve. But the valve will often open when you get compressor surge since it sends very high boost spikes into the inter-cooler pipes.Compressor surge can damage the turbo bearings, Get it checked.----------
This will help.Keep updated.Thanks.Helpmech.
Posted on Apr 16, 2011
The wastegate may be mal-adjusted now after fitting the new turbo, it sounds like it is shunting boost pressure down the exhaust thru the wastegate valve which is vacuum operated.
Posted on Dec 06, 2009
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