Question about 1985 BMW 3 Series

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My 1986 325es cranks but won't start. I do smell fuel after about 30 seconds of cranking. This is the first time it hasn't started since it was new I have a little over 200K miles on this great car.

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  • wyelder May 02, 2009

    I have the same problem with my 325es. But my battery seems to drain. Now the car isn't starting at all.

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Check the fuel pressure regulator

Posted on Apr 06, 2009

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Here are three possible options, One you should check on the flywheel and make sure there is a tiny block of metal alongthe rim of it generally on the top but it does move, this is the Crank Sensor Pin and if it doesnt have that then theres no way its going to start, Second, you might need to replace the Speed reference sensor, Its the grey sensor on top of the block, because those combined with the crank pin wont let it start, Third along with the speed reference sensor there is a Crank Shaft sensor, the black one next to the speed reference senor, these go bad after around 150K. And another would be to check the Oxygen Sensor; another one you might want to check even though you say it cranks, is check the Ignition coil

If you have any questions email me, and I can try to help (Had these same problems with more.) The.Squall1@gmail.com

Posted on Feb 03, 2009

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1 Answer

Enith carburetor diagram


Nobody has messed around with the ignition timing in any way?



If it has stood for a long time(i.e years..) the fuel may have degraded to the point that it\'s useless.



The carbs will smell of fuel, but are you sure that fuel is being pumped to them in sufficient quantity? Try disconnecting a fuel line, crank the engine a few revolutions to see if fuel is pumped out.



Try gravity feeding the carbs. Use a can of fuel connected to the carbs, held above the engine. Get somebody to crank the engine and see if it fires up. If the engine fires up, suspect the fuel pump.. or fuel lines.



An air leak can also cause non-starting. The usual cause is the inlet manifold gasket. Any air leaking through the gasket can cause your non-starting problem. Go back and check that no dirt has been picked up by the gasket before you fitted it/it hasn\'t been ripped. Check that the inlet manifold has been correctly tightened.



It doesn\'t sound as though you have much of a problem .. more of a \'niggle\'.

The link is for Zenith carburettors:



Zenith carburetor Google Search

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1 Answer

Cranks but won;t start, is it the fuel pump?


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