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E34 (1989 - 1995)

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  #1  
Old 01-23-2013, 09:06 AM
windgat windgat is offline
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Location: south africa
 
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Mein Auto: bmw 525i e34
540i misfire and start prob

bmw 540i e34 takes forever to start and when started there is a misfire
fixed a cracked manifold.replaced fuel pump but still no results if someone knows what the problem is help
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  #2  
Old 01-23-2013, 09:45 AM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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Mein Auto: 1992 525i
Check the crankshaft position sensor. Should be 540 +/- 10% ohms. Check main relay. Check fuel pump fuse and fuel pump relay. Check fuel pump.

Get the Bentley manual and read, read, read.

Good luck.
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  #3  
Old 01-23-2013, 10:07 AM
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Monsignor Monsignor is offline
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i would check spark before fuel. seems like a bad coil or plug even...
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  #4  
Old 01-23-2013, 08:33 PM
snowsled7 snowsled7 is offline
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I would be inclined to check plugs and coils. I suspect coils can be tested and the Bentley manual, already reccomended, should have the specs.

When you replaced the fuel pump did you verify fuel pressure? Can you hear the pump run? If no pressure follow the relay advice from BMRLVR.

Check for other vacuum leaks, cracked hoses, fittings.
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  #5  
Old 01-24-2013, 03:04 AM
windgat windgat is offline
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Location: south africa
 
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Mein Auto: bmw 525i e34
thats the thing.8 bosch spark plugs was put in.as for coils there was one dead so i replaced.fuse,relay that was the first thing i checked.as for the sensor where to get new one remember south africa
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  #6  
Old 01-24-2013, 12:00 PM
upallnight upallnight is offline
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Quote:
Originally Posted by windgat View Post
thats the thing.8 bosch spark plugs was put in.as for coils there was one dead so i replaced.fuse,relay that was the first thing i checked.as for the sensor where to get new one remember south africa
Buy a parts car.
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  #7  
Old 01-24-2013, 12:44 PM
SwissCheeseHead SwissCheeseHead is offline
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Mein Auto: 08 G37,94 530i,11 328iT
I would go with others and check for spark. If it's not spark plugs or coils and you replaced fuel pump, I would check for fuel pressure. Lastly, check for compression between 142-159 psi. Are you throwing a code? I'm still new to OBDI but it might point you in the right direction at least.
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