[rashid]

I have an e39, 530 – 2002 with 386,000KM.

From time to time, I face difficulty to start the engine & the RPM will drop for few times before it fires & when I shift to D, it will drop again. Any thoughts or ideas?

 

[r1bby]

Depends on your engine (petrol diesel) etc..
You could try taking it to a garage for a proper diagnostic.
Or you could could buy yourself a Haynes manual and try checking the battery power, terminal connections, defective starter solenoid or switch , starter motor, air filter dirty or clogged, ignition components damp, spark plugs, etc, etc, etc...
Hell when was the last time it was serviced?
Good luck!

 

[roma]

did the check engen light come on? yes ,check the code,maybe misfire,intake elbow,gas filter,02 sensor check all this and you shuld be fine ...good luck

 

[rashid]

I have petrol engine

1.The battery is ok.
2.Starter is also ok
3.Air filter dirty is cleaned & ok
4.Spark plugs are new & ok
5.Check engine light is not coming on - ok
6.Gas filter is new – ok
7.O2 sensor – what are the symptoms for faulty O2 sensor?

 

[roma]

I have petrol engine

1.The battery is ok.
2.Starter is also ok
3.Air filter dirty is cleaned & ok
4.Spark plugs are new & ok
5.Check engine light is not coming on - ok
6.Gas filter is new – ok
7.O2 sensor – what are the symptoms for faulty O2 sensor?

even if the light is not on the code should be stored and check MAF

 

[rashid]

even if the light is not on the code should be stored and check MAF

ok, how to read the codes? any external tool is required?

 

[rashid]

Turned out to be the CAM-SHAFT sensor. Replaced & 200$ (including labor) & it works fine now.

 

[witeshark]

Very glad it's sorted!