Low power at low rpm (below 2200 rpm or so)

[alex 1993 525i auto]

I tested the throttle position sensor tonight and it is fine, as per Bentley (1.37-3.98K ohms, etc.). Also I forgot to mention that it not always so bad at low rpm, it is like intermittent...

Thanks for your replies gents.

On this: ''I believe your thinking is off a bit, the intake cam advances at low RPM not higher RPM. So by default it should be advanced which is not your symptom right now. Visual inspection for sure especially with noises coming from up front.''
If the cam are advanced at default position (or low rpm), but my Vanos 'stucks' the cam at the 'retard' position, could then be explaining the car's low power at low rpm?

On the vacuum leaks related stuff I'm pretty sure there is nothing wrong there, I replaced most tubings (if not all) in the last 5 years, I removed/intalled the intake for replacing the camshaft position sensor (and replaced leaky Vanos oil line while in there)l and triple checked that everything was back like it should... and again no change in behaviour before/after this operation. Like I said if the car idles (fine) and I quickly depress the throttle body fully, the engine will stop/conk out like if it was missing air/fuel.

I will check under the valve cover asap (next week-end or the other next). The car has been running like that since 1 month or more between the ordering of the CPS and now. Whatever wrong if it fails for good then it will be easy to troubleshoot.

Post any other ideas if you have guys,
Thanks

[genphreak]

Post any other ideas if you have guys,
Thanks

"I'm in doubt if all that can be Vanos related now. I'll check anyways at some point when I have time, my valve cover gasket is due for replacement (is leaking oil"

Remember... if oil comes out, air is going in...

1. So since yesterday, did you fix the valve cover gasket leak?

2. Another angle:
Also you need to measure fuel pressure if you have not already- esp. when it is idling badly or under load. Mechanics do this regularly with customer cars as fuel pumps and other upstream electrical faults are common causes of running problems. On three of my e34s, over the space of 10 years, I've had to replace 3 pumps- and they all had running problems before failure...

3. ... and another,
On an M20 or M30, a cause of low power is often a stuck valve. On an M50, it is less likely- but it could be a problem. Are the spark plugs wearing/fouling differently?

[ahlem]

crankcase ventilation leaks at the dipstick or breather hose?

[632 Regal]

If the cam are advanced at default position (or low rpm), but my Vanos 'stucks' the cam at the 'retard' position, could then be explaining the car's low power at low rpm?

Yes exactly.