Question about 2006 BMW 523i

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I have bmw car 523i 2006 model the problem is in the begining of start of the car the engine is not stable the rpm is going up and down to much

The engine rbm is going up and down at the begining of working and it seems to be shutt down

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

Doktir
  • 55 Answers

SOURCE: 2006 BMW 523i shaking in the mornings

Strange, it sounds like you've got a dead spark plug, but that would be continuous, not only in the morning, the other explanation could be that the engine management is injecting too much fuel, flooding the cylinder, and wetting the spark plug, which would explain why you need to wait 5 mins for the fuel to evaporate. Try disconnecting the battery for 30 minutes to reset the EMS, if that doesn't help, get to a workshop and let them check the EMS with a computer, the electric choke may be sending the wrong signals to the EMS. Hope this helps!

Posted on Mar 10, 2009

  • 24 Answers

SOURCE: i own a bmw 523i 1998, when stop at traffic light,

Hi There,
Hopefully i can point you in the right direction mayeb even offer a solution,
Generally i have foudn that when this happens its mainly due to a vacuum leak somewhere in the system. Check all the small rubber hoses in and aroudn the intake manifold.
If they are all non perrished and in good condtion it coudl be something else such as a clogged injector, However there are soo many possibilities and problems that it could be.
With cars the main problem is that sometimes its a few different things causing the one problem.
Has the car been tuned recently/Serviced.
Generally if air filters /fuel filters are blocked and dirty they can also help cause hunting in engines.
It could also be that you throttle linkage is sticking. This is common in older cars as dirt grease and oil builds up on the engine and can stop linkages moving correctly, 
You coudl try following the wire that runs to the accelerator/gas pedal to the butterfly and try cleaning and lubricating with a reputable spray on lubricant that wont attract dust on all the linkages carefully and see if this helps .
Other common problems may be timing chains/belts, If they need replacing they tend to cause spiraddic idle as well although generally it would be really bad all the time,
Sometimes however it can be a problem with the cars onboard computer, be aware that if your cars battery is running low on charge or is long past needing to be replaced this to can effect the computer and cause spiradic idle as the car trys to compensate revs to push more charge through the alternator.
I know its not really a definitive solution but i hope it helps save you takinng it to the mechanic.
Cheers
Steve

Posted on Apr 03, 2009

junmag
  • 175 Answers

SOURCE: BMW 523i 1999 model

your car is not suppose to idle at 500 rpm . 800 to 950 is the proper idle, unfortunately it is controlled by the computer. have you checked the idle speed control valve? also check the air flow meter

Posted on May 28, 2009

  • 21 Answers

SOURCE: How do I change the spark plugs on a BMW 523i

The spark plug change is very straight forward. Basically, you remove the plastic valve cover trim panel, unplug the harness plugs from each of the ignition coils, remove the two nuts securing each coil, pull the coil up. The rubber spark plug connector boot should come up with the coil. You can now remove the spark plugs.

The spark plugs are not gappable. Install them as they come out of the box.

Replace the rubber connector boots at the same time, these wear out and can cause miss-fire problems.

Note that if you find oil in the spark plug wells, the valve cover gaskets must be replaced. Not only does this make a mess, but it deteriorates the boots and also causes miss-fires.

See the DIY article in the Spring 2005 issue of the Bavarian Autosport - Fast Times newsletter (see link below):

http://www.bavauto.com/shop.asp?HC1=0&HTarget=sc_fasttimes.asp&HCY=&HCM=

Contact Bavarian Autosport for the spark plugs and connector boots (and valve cover gaskets) at 800-535-2002, or order online.

Posted on Sep 03, 2009

tbarratt
  • 96 Answers

SOURCE: Where is the Crank Sensor '99 BMW 523i E39 Auto

are you sure you need the crankshaft position sensor changed. it is at the back of the engine i believe, but.....
check for a wet ecu first... read the note on e36...

the ecu compartment is under the windshield on the passenger side on E36

you gain acess to it under the hood....
this compartment gets wet, the ecu lays on a flat surface in that
compartment.

the bottom side of the circuit board gets wet and starts corrosion.

remove the ecu, take the bottom plate off, clean the bottom of the circuit
board with alcohol and a soft tooth brush.

you should be able to see the signs of corrosion or conductive build up.

this gunk bridges solder points doing all sort s of wierd things to your
car, including false sensor readings from asc/abs controllers and other
sensors....

all the way to engine failure and worst case burnt and shorted wiring
harness.

I'm on my 3rd ecu, took me and the repair boys a few years to figure this
one out.

BTW: i would get that ecu mounted above that flat surface, use some sort
of standoff to raise it so that it is not laying in the wet.

Posted on Feb 07, 2010

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