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7 Series - E23 / E32 (1977 - 1994)

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  #1  
Old 02-22-2011, 08:01 AM
bgbeemer bgbeemer is offline
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Location: SC
 
Join Date: Sep 2010
Posts: 13
Mein Auto: 1988 735i
88 735i cranks but wont start engine flooding

I am at the end of my rope! after working to get this car street ready (brakes, window motors, drive shaft, water pump, fan clutch new a/c compressor, Bosch spark plugs, new wires, cap & rotor, new coil,new crankshaft position sensor, new oil & filter)) The car was running great and then out of no where it stalls out.
I can not get it to start. it cranks over and if I crank it long enough it sounds like it will almost start. There is fuel delivery and I pull a spark plug and it is getting spark. But when I pulled out all the spark plug they were soaked with fuel. They have only 200 miles on them. I blew off all the plugs and put back in and cranked the engine and no start. When I took out the plugs again they were soaked with fuel. It looks like the engine is getting flooded with fuel to the point I had to change the oil because it smell like fuel. I didn't want to ruin the starter so I haven't tried it again in fear it will fry the starter. The fuel filter is new but I am learning as I go here with this car so any help will be greatly appreciated.
The car has 180000 miles on it so I am assuming everything else is original on engine
HELP HELP HELP
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  #2  
Old 02-22-2011, 08:54 PM
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joyism5 joyism5 is offline
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Location: USA
 
Join Date: Jan 2011
Posts: 1,270
Mein Auto: '99 740IL, K75RT
Your gas/oil mixture is due to a misfire. Unburned fuel is passing the rings or seals and goes straight in the engine. Couple months ago I had a similar situation with a 89 525..
Check the distance of your crankshaft sensor, check the TPS (throtle position sensor), check the MAF. In my case the misfire was due to cracked cylinder head. compression test is required to diagnose that. In your case is very possible to be the TPS or MAF or even timing belt. Have you checked the alignment marks? Probably tomorrow I will find my pdf with checking procedure for sensors in case you don't know how.
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Old 02-23-2011, 06:17 AM
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joyism5 joyism5 is offline
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Mein Auto: '99 740IL, K75RT
Check this 2 pdf.
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  #4  
Old 02-23-2011, 02:56 PM
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TerryY TerryY is offline
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Location: Woodland Washington
 
Join Date: Jul 2003
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Mein Auto: BMW '95 840
Pull out the fuel pump fuse and try to start it after cleaning off a couple of plugs. It should run until the cylinders dry out. Then put the fuse back in and restart immediately.

Every time you try to start it pumps more gas on start enrichment (like a choke). With out the fuse it can't add anymore fuel to the cylinders. I did it to my old 740 by starting and stopping the engine too many times without letting the car warm up enough to dry itself out.

The small center electrode platinum plugs tend to get wet easier than stock plugs.
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Last edited by TerryY; 02-23-2011 at 02:59 PM.
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  #5  
Old 02-23-2011, 04:27 PM
bgbeemer bgbeemer is offline
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Location: SC
 
Join Date: Sep 2010
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Mein Auto: 1988 735i
thanks everyone I will try those things tomorrow when I have daylight
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