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  #1  
Old 02-17-2015, 03:03 AM
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flooded engine cylinders

I was searching this site for flooded engine, and found this video that help fix the problem.


2002 x5 e53 225,000 miles. It was cold, 10 degrees F, and being an older car I wanted to keep it in the garage. I started the car on the first crank and moved the car inside and turned off engine. Car was on no more than 1 min. Next morning I tried to start the car and It just kept cranking but not starting.

After watching this video, I now know I had to keep my foot on the pedal.

https://www.youtube.com/watch?v=4Ha9Gq72wNs

bobbio
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  #2  
Old 02-18-2018, 06:15 PM
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De-flood worked on 06 X5 e53

....thanks for the de-flood link! Worked for my ‘06 e53....Never flooded my ‘04 X5 e53 during almost 200,000 milles of ownership r.i.p....but my ‘06 which I bought last year w 103,000 miles and wonderful condition interior, has twice flooded the engine....both times happening when the engine was running for under a minute. If your engine floods, and the above video link is broken, here is the procedure:

1). put key in ignition and turn to position “1” ( when the dash lights up).

2). Floor the gas peddle.

3). Crank the engine, with the gas peddle floored, for 15-20 secs.

4). Rest 15-20 secs.

5). Repeat steps 1-4 until you hear the engine start to start

when you perceive the engine is starting to run, let off the gas peddle and the engine should start to idle. If it conks out, you can then try to start the car “normally” as excess fuel should now have exited and de-flooded the engine. My car took about 4-6 cycles of the above,

Dave
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Old 02-18-2018, 07:00 PM
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Never start a car and shut it off unless you have let it run for at least 5 minutes. BMW M50 thru M54 engines are known to flood if you start the engine move the car and shut it off when the temperature is below freezing. Also never use starting fluid because the hot wire in the MAF may ignite the mixture. You may damage the MAF or start a fire in the engine compartment.
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Old 02-18-2018, 09:53 PM
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Some procedure as old school engines. Foot to the floor and crank.
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Old 02-20-2018, 01:25 AM
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I didn't think it possible to flood a fuel injected engine.
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Old 02-20-2018, 01:12 PM
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Quote:
Originally Posted by Fifty150hs View Post
I didn't think it possible to flood a fuel injected engine.
From my experience tuning an aftermarket EMS, they run pretty rich during and right after startup to help the car start and idle easier during open loop until the cats and emissions stuff triggers closed loop running. So I'm guessing that's the reason it's possible under just the right circumstances.
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Old 02-20-2018, 02:26 PM
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Quote:
Originally Posted by crystalworks View Post
From my experience tuning an aftermarket EMS, they run pretty rich during and right after startup to help the car start and idle easier during open loop until the cats and emissions stuff triggers closed loop running. So I'm guessing that's the reason it's possible under just the right circumstances.


That's why I tell people to wait at least 5 minutes before shutting down their BMW when the temps get below freezing. 5 minutes of running should heat up the 02 sensors and you would be in the closed loop where the fuel system can be adjusted by the computer. When the engine is in open loop it is just operating base on the ect (engine coolant temp) and the ambient air temp with a predetermined fuel map. This fuel map provides for a very rich mixture to prevent the engine from stalling on very cold days. Back before computer controlled electronic fuel injection (BC) the rich condition was provided by a choke on the carb. The choke would restrict the amount of air entering the carb so the mixture will be a lot richer.
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Old 02-20-2018, 02:30 PM
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When running the engine a short time causes the engine to flood, it shouldn't still be flooded the next morning. The fuel should have evaporated overnight. Cold morning flooding is often an indication of a weak battery not cranking the engine fast enough or another problem such as plugs that need to be replaced that don't cause a problem in warmer weather.
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Old 02-20-2018, 03:24 PM
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Quote:
Originally Posted by bcredliner View Post
When running the engine a short time causes the engine to flood, it shouldn't still be flooded the next morning. The fuel should have evaporated overnight. Cold morning flooding is often an indication of a weak battery not cranking the engine fast enough or another problem such as plugs that need to be replaced that don't cause a problem in warmer weather.
Only a few cylinders will have a valve open, so essentially, the other cylinders will be closed tight so the gasoline will have nowhere to evaporate. That's is why the gasoline in your tank don't evaporate overnight.
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Old 02-20-2018, 07:22 PM
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Quote:
Originally Posted by upallnight View Post
Only a few cylinders will have a valve open, so essentially, the other cylinders will be closed tight so the gasoline will have nowhere to evaporate. That's is why the gasoline in your tank don't evaporate overnight.
If an engine was like a gas tank there would still be compression in those cylinders with closed valves the next day. Also, it doesn't take much of a flooded condition to wash the oil film off the cylinder walls to the point they don't seal. Cylinders are not airtight.
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