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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 08-21-2016, 07:52 AM
Rutland75 Rutland75 is online now
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Location: UK
 
Join Date: Aug 2016
Posts: 4
Mein Auto: E39 323i 2000
MAF information

I have just purchased a BMW E39 523i 2000 Touring, with issues, when I received the car it was a none runner, first job was to get the engine running.
There are problems with oil in the water but they will keep until the non running is sorted.
When I tried to start the engine it would fire and run for three seconds and then stop, I removed the cable to the MAF and the engine would run but not very well, it was surging.
I removed the MAF with the intention of cleaning it only to find it was very clean and did not look very old.
I removed and cleaned the unit that is fitted adjacent to the throttle body (sorry I do not know its name I am still learning).
The engine is still a none starter but it will run very well with the MAF disconnected.
I do not want to purchase a new MAF if there is another reason.
Any help would be appreciated.
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  #2  
Old 08-21-2016, 08:14 AM
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TheAngryBear TheAngryBear is offline
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Location: Springfield, VA
 
Join Date: Jul 2015
Posts: 1,803
Mein Auto: 540iA Sport 03/03 GS56111
Unplugging the MAF makes the engine run off tables vs reality. Likely you have several air leaks and other issues. You need to get a scanner to read the engine data. Something like Creator/inpa etc. do a search in the forum and there are several recommendations.

Meanwhile check your hoses for leaks, cracks, and connections. Any suspect and replace it.
Check your fuel pressure through the schrader valve: should be about 50+
Check spark plugs conditions and that they are sparking.
Check for exhaust gasses in the coolant.
Eventually check cylinder compression.

Report back and we can help you from there.
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  #3  
Old 08-21-2016, 03:50 PM
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Burning2nd Burning2nd is offline
Under the lift arms
Location: Under the lift arms
 
Join Date: Aug 2010
Posts: 7,092
Mein Auto: E39 540, E36 328is, E83x3
check for vacume leak
check voltage
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Old 08-21-2016, 06:29 PM
Barracuz Barracuz is offline
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Location: Providence, R.I.
 
Join Date: Apr 2015
Posts: 1,190
Mein Auto: 2001 525i 5 spd
Oil in water points to a head gasket issue which could also be the cuase of your non running issue.

You have already tested and confirmed that the engine will start and run. As TAB and burning already mentioned do a smoke test and inspect your entire vacuum intake system for leaks.

Also if you are having air leaks the ecu will detect em and throw a check engine light so grab a code reader and check for codes which can help pinpoint your issue.
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  #5  
Old 09-09-2016, 02:22 AM
Rutland75 Rutland75 is online now
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Location: UK
 
Join Date: Aug 2016
Posts: 4
Mein Auto: E39 323i 2000
I would like to thank you all for your advice, I found that the intake hose just after the MAF was broken, I replaced this part and also the several vacuum hoses, the engine runs and starts a lot better.
I am away from home at present but on my return I will have to sort out the oil in water problem.
The history of the problem as I have been told is as follows -
I knowingly purchased the car with this known fault, the car dealer who I purchased the car from took the car in part exchange about four years ago,(it would be true to say the dealer in question is economical with the truth) he operated the car for a few months and then found oil in the water, he obtained the services of a BMW mechanic (he did the work in his spare time) who removed the cylinder head, the head was sent to a machine shop for the head to be resurfaced and the valves re-faced, the machine shop also pressure tested the cylinder head (the BMW mechanic also overhauled the brakes) the head was refitted together with a new radiator and hoses.
The said dealer then used the vehicle again, after a few months he was aware that oil was in the water, he took the vehicle to an Indie who again removed the cylinder head and fitted another head gasket, I am not aware if the head gasket was faulty.
After another few months the same thing happened, he then parked and left the vehicle, the car is in good condition and deserves to be resurrected.
On my return I will remove the head, the camshaft housing and if there are no obvious cracks drill, tap and plug the oil supply holes in the cylinder head, with the oil supply hole from the block I will fit an adaptor and connect to an airline, with this I should be able to see if there is a crack between the oil supply and the water jacket.
Has anyone carried out this procedure before?
Is there schematic available for the oil system?
I have seen on another post that a C310 code scanner would be a good economical purchase
would this item be suitable for the 523i ?
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  #6  
Old 09-09-2016, 02:27 AM
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Burning2nd Burning2nd is offline
Under the lift arms
Location: Under the lift arms
 
Join Date: Aug 2010
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Mein Auto: E39 540, E36 328is, E83x3
No big deal... Bmw's take it with stride...

Just dont run out of oil
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