Question about 1994 BMW 3 Series

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Starting problems when hot sorry could not get 540i to come up

Not a 3 series a 5 series
540i 320,000 klm


runs extremely well however starting to get problem when starting hot.
Cold start perfect 2 turns and away once hot can turn for what seems ages before it starts. Also notice fuel consumsion is getting worse.

have had it looked at a number of times injecters done replaced fuel filter apparently checks fine on computer. ugh pleas anyone with idea would be really appreciated.
Cheers Keith

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  • Contributor
  • 8 Answers

Reboot it

Posted on Jun 05, 2017

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: bmw 530d 99 model starting problem

replace the crankshaft sensor

Posted on Jul 03, 2008

  • 145 Answers

SOURCE: BMW 525i will not start

There are six fuse panels for an E39 BMW
Fuses F1 - F45, fuse panel 1, glove compartment. Twist white plastic retainers 90 degrees and pull down from top of glove compartment.
Fuse 31 (10 amp) protects fuel pump relay(K96)

Fuses F46 - F6, fuse panel 2, trunk located behind right side luggage compartment interior panel.
Fuse 54 (15 amp) protects fuel pump relay(K96)

Before I would do any of the following, I would check the above fuses and put a bottle of HEET into the fuel tank. Fuel filter changing is not hard, but it will take you about an hour.
The fuel pump is another story (BMW has a special spanner wrench(16 1 020) to remove and install the threaded collar.

E39 BMW use a two-lobed fuel tank(think saddle bag like). Each with its own fuel level sending unit that has a float connected to a variable resistance wiper contact. To equalize fuel level between the two tank lobes, a siphon pump is installed in the left lobe. The resistances need to be approximately the same. The fuel pump is on the right lobe under the tank sending unit beneath the threaded collar at the top of the fuel tank which is accessed by removing the rear seat cushion. WARNING When removing the fuel level sender or the fuel pump, the fuel tank should be drained to 1/4 capacity or below. The fuel in the fuel line is under pressure (45-75 psi). Always unscrew the fuel tank cap to release pressure in the tank before working on the tank or lines. Disconnect battery negative cable.

The fuel filter is located beneath the center of the car near the driver's seat usually under a protective metal cover held on by small screws. Not hard to replace but car will need to be on jack stands and 1/4 tank or less of fuel in the tank. Definitely wear safety goggles or face shield as the fuel will come out on face. Have a fuel catch pan under the filter. Clamp the fuel line before and after the fuel filter(long metal cylinder) before loosening hose clamps. Loosen center clamping bracket and hose clamps on either end of filter. [Some have an inline fuel pressure regulator.(Remove vacuum hose, pull out locking clip, remove fuel pressure regulator).]
Drain fuel from inlet side of filter and check fuel for rust moisture or other contaminats.
Installation is reverse. When installing fuel filter, ensure fuel flow direction arrow points to front. Should have at least 5 liters of fuel in tank before restarting. The fuel pump will be damaged if run without fuel.
PT Stanley

Posted on Jan 23, 2009

  • 5 Answers

SOURCE: 1994 bmw e36 325 tds

There is a company in Northern Ireland called Exact Engineering that can convert your dual mass flywheel to single mass using a complex engineering process ending with a finely balanced guaranteed single mass product. They have a complete courir service.

You can see their website at www.exact-spec.com and contact them at info@exact-spec.com

Posted on May 29, 2009

  • 1 Answer

SOURCE: BMW E46 320d SE 2002 Poor starting from cold, OK when warm.

rub your **** on the key fob

Posted on Jul 22, 2009

alicantecoli
  • 22114 Answers

SOURCE: bmw 325tds diesel flowing back to tank when parked

usual problem ,valves in injector worn for the fuel pump.easy quick fix this one ,fit a non return valve in the inlet pipe,check flow direction on valve when fitting and evan better as well is another in the bleed off return pipe .valves available from a motor factor or a specialist garage like bosch or lucas ,cut pipe and fit the valve with a piece of rubber pipe to connect the valve in line.or listen to the people who want to milk the golden cow and have the whole injector pump overhauled .

Posted on Dec 23, 2009

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