As a general rule black smoke is soot from excess fuel, white smoke is either steam or a great deal of unburned fuel (mainly diesels) and blue or blue/grey smoke is burning oil.
A trail of sooty smoke would indicate too much fuel is entering the cylinders. Perhaps you have a dribbling injector or a faulty sensor or perhaps your injectors are old and worn with bad spray patterns.
SOURCE: diagram for serpentine belt for 2002 BMW 525i
An image of a serpentine belt, hope this will help you,
Eitan.
SOURCE: my 2002 bmw 525i has broken front seats. When I
This is a common BMW problem before giving to a mechanic try looking at the mechanism to see if any bolts are loose or missing,you might find the bracket is broken or torn and needs to be welded or replaced,the job is relatively easy but be carefull because of the SRS system if not sure give it to an expert.
SOURCE: oil change reset for bmw 525i
You only need to hold the left odometer reset button while turning the key to position 1 (Accessory). Keep holding the button for 5 or so seconds until any of the following shows in the display: OIL SERVICE or INSPECTION with RESET or RE. Release the button and press it again for another 5 or so seconds until RESET or RE flash. While the display flashes, press the button one more time briefly. If done correctly, END SIA should show up for a few seconds. All done.
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SOURCE: 1995 BMW 525I over heating issue. I repaired head
Hi, Sounds like you have tried about everything. Ok the aux. coolant switch is for the electric pump for the heater core will not cause an over heating condition just a longer warm up of the heater core. Has the cooling system been bleed properly if there is a trapped air pocket it will not let coolant circulate. Was the new thermostat installed correctly? They have a vent that needs to be towards the top or they trap air on the back side and cant take an accurate reading to open and close. Other areas to look at would be proper operation of the fan clutch, if they fail they can cause the fan to not lock up properly and supply enough air movement through the radiator. The aux. electric fans and their temp switches do you hear them coming on are they coming on at the right temp.
SOURCE: Fast Idle Problem With 99 Isuzu Rodeo V6
Hi.
If problem is only on startup and when idleing, then the
problem is likely IAC system, also a vacuum leak will cause the same
problem.
If problem is not only on startup and idle, but also when driving, then MAP sensor and EGR system must be checked.
Check also accelerator cable state and setting.
The
first thing to do is pulling out the OBDII fault codes stored in the
ECM. This is done connecting a code reader to the ECM diagnostic port.
The job can be done for a small fee at any local garage, and it is done
for free at AutoZone.
The codes will help locating the problem.
About possible faults:
Problem
is stalling when idling and during startup, but engine idling fast all
the time. Problem not starting at times it is due to the fact that the
wrong mixture is being sprayed, this is probably causing flooding and
misfire. Since the CEL is on, one of the codes returned is probably
misfire.
Check accelerator.
Check IAC system. This is
composed by a valve and a solenoid that check and control amount of
extra air air when the engine is idling. The IAC valve is located on top
of the throttle body.
Check the vacuum system and try cranking with gas tank cap off. Vacuum
system is tested using an hand tool gauge onvacuum lines while spraying
card cleaner on the hoses (or heating them with a torch). If there is a
leak, pressure will go up. A big leak will also do hissing noise, and
will often result in a lean code when doing an OBD code scanning.
This kind of symptoms can also be caused by weak wiring to MAP/MAF sensor (MAP in this engine).
If the car also drives very rough and is revving up and down in a weird way, check the EGR valve.
As
first thing I would do a code scanning. This car is OBDII. The scan can
be done for free at the nearest Autozone, or for a small fee at any
garage.
If you get any OBDII code from the scan, report it here, so that we can individuate the possible reason for the problem.
If
you repute my solution helpful, then please take some times to accept
the solution. Providing good repair tips requires time and skills, and
your feedback is important for us.
Regards.
Ginko.
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