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-   -   I have e39 2000 540i HELP!!! :( (http://forum.e46fanatics.com/showthread.php?t=958528)

heath\ 11-29-2012 11:06 PM

I have e39 2000 540i HELP!!! :(
 
My brother was driving to school, and the car suddentley turned off on him..no noise or anything different.. He went to turn it back on and the temperature gauge SHOT up!!! But the car just left the house, it isnt hot..and not at 9 pm it's still at hot but the car never got hot!!!!! Help!!!! :(

eneka 11-29-2012 11:41 PM

belt broke=alternator and water pump stops working=dying and overheating car

btw wrong forum.

heath\ 11-29-2012 11:46 PM

sorry but my car didnt overheat thats the thing!! when the tow truck came i was 1.3 miles from my house! it wasnt hot! it is now almost 10pm and when i turn the key in the car it still says hot but the car has BEEN cold!! and yes i know i am in the e46 posts but im desperate !!!! HELP!!!

peytonracer4 11-29-2012 11:52 PM

Why did the car shut off? Did a belt actually break?
It sounds to me that you have some electrical issues. Check you battery to see if its good. Disconnect it for an hour.

lucky_doggg7 11-30-2012 02:53 AM

On a M3, the ECU uses the water temp sensor to determine how warm/hot the engine is; it does not use a separate sensor that is screwed into the aluminum head, like that in the older Bosch FI systems.

I would guess that the BMW ECU would be "intelligent enough" to protect the expensive engine by shutting the car down if it detected a very high water temp from its sensor. If the E39 FI system is anything like the E46 M3 Siemens FI system, try buying a new water temp sensor and replace the old one and then see what happens. If replacing a water temp sensor doesn't appeal to you, take it to a shop that has a OBD II scan tool that can specifically read all the 540's sensors, and any stored trouble codes. Not all scan tools are created equal; most descent one's obtain generic info from the OBD II system, but you want the one that goes beyond generic info; you want a scan tool that can read and test all of the 540's electronics in the engine bay. That is the difference between a $250 scan tool and a $3,000 dollar scan tool. Good luck fellah.

RayPooley 11-30-2012 03:19 AM

Quote:

Originally Posted by lucky_doggg7 (Post 14939685)
On a M3, the ECU uses the water temp sensor to determine how warm/hot the engine is; it does not use a separate sensor that is screwed into the aluminum head, like that in the older Bosch FI systems.

I would guess that the BMW ECU would be "intelligent enough" to protect the expensive engine by shutting the car down if it detected a very high water temp from its sensor. If the E39 FI system is anything like the E46 M3 Siemens FI system, try buying a new water temp sensor and replace the old one and then see what happens. If replacing a water temp sensor doesn't appeal to you, take it to a shop that has a OBD II scan tool that can specifically read all the 540's sensors, and any stored trouble codes. Not all scan tools are created equal; most descent one's obtain generic info from the OBD II system, but you want the one that goes beyond generic info; you want a scan tool that can read and test all of the 540's electronics in the engine bay. That is the difference between a $250 scan tool and a $3,000 dollar scan tool. Good luck fellah.

^^^^ Sounds like sound advise.

tim330i 12-03-2012 10:44 AM

Check out the E39 forum on Bimmerfest.com for help from other E39 owners -

http://www.bimmerfest.com/forums/forumdisplay.php?f=103

Tim


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