540 idle problem

[Lee540i]

whats up guys in need of a bit of advice. last couple days car revs high to about 2000rpm and then will drop to normal if I tap the accelerator pedal.. what could problem be? lose Bowden cable? Bmw %40 I 1995 6 spd manual

 

[maximus]

whats up guys in need of a bit of advice. last couple days car revs high to about 2000rpm and then will drop to normal if I tap the accelerator pedal.. what could problem be? lose Bowden cable? Bmw 540 I 1995 6 spd manual

Does it increase incrementally? like up and down, up and down?

-Clean air flow meter?
-Vacuum pipe for leaks?
-Check the breather pipes right before the throttle body?
-PCV plate that sits on the back of the intake manifold. If you hear a hissing noise from that area, it's probably dead. Can cause crappy idle etc.

 

[Lee540i]

whats up guys in need of a bit of advice. last couple days car revs high to about 2000rpm and then will drop to normal if I tap the accelerator pedal.. what could problem be? lose Bowden cable? Bmw 540 I 1995 6 spd manual

Does it increase incrementally? like up and down, up and down?

Clean air flow meter?
Vacuum pipe for leaks?
Check the breather pipes right before the throttle body?

Yea like I will be driving and then when I go to change gears the revs don't drop and when I come to a standstill it will idle high and then drop as soon as I engage the pedal and pull off...

 

[maximus]

Hmmm I'm out of ideas....

Anyone else? Nic? Rick? Uber? Ray?

 

[Nic_s]

Unfortunately I don't know much about the throttle setup on the M60 motor. However, you can check for any obvious sign of it getting stuck by looking at the throttle as someone blips the pedal for you. The red arrow in the pick below is where the throttle is located. It's the only place where I can think there might be an issue that could be keeping the revs higher than it should be by getting stuck.

(Click image to see larger view)

 

[Sankekur]

Check for obvious signs of something preventing proper movement of the throttle, also check if the throttle movement isn't sticky.Also check the idle control valve, if it isn't maybe sticking.
(The throttle I a referring to is the second one, the one that is closer to the intake manifold)

 

[Lee540i]

Thanks a lot guys will have a look today and will give some feedback hopefully can get my beast 100's again!

 

[rick540]

Sounds like the throttle position potentiometer on the side of the throttle body

 

[Gregmeister]

I had a similiar issue on my M62. Took the trottle body off and gave it a good clean. problem solved. So maybe try that first. :thumbs: