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Louis Carroll
Guest
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 Posted:
Tue Nov 23, 2004 4:50 pm Post subject:
How to adjust RPMs |
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I have a 1995 BMW 518. The engine runs at about 1100 when idling. I do
a lot of slow city driving and feel that this rpm are a bit high for
optimum fuel consumption.
Two questions
1. What is the recommended rpm when idling?
2. How can I adjust rpm - the accelerator cable is adjusted to
maximum?
Thanks People....
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Somebody
Guest
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| Posted:
Tue Nov 23, 2004 5:40 pm Post subject:
Re: How to adjust RPMs |
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"Louis Carroll" <galwaycarrolls@eircom.net> wrote in message
news:5e236c63.0411230350.14c0dc0c@posting.google.com...
| Quote: | I have a 1995 BMW 518. The engine runs at about 1100 when idling. I do
a lot of slow city driving and feel that this rpm are a bit high for
optimum fuel consumption.
Two questions
1. What is the recommended rpm when idling?
2. How can I adjust rpm - the accelerator cable is adjusted to
maximum?
Thanks People....
|
Sounds like a problem with the idle control valve, or perhaps a vacuum leak.
What happens when you are idling and you go from nothing to engaging all
power accessories you can and your A/C, does the idle drop, race, or stay at
1100? Any difference from cold to warm?
-Russ. |
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John Burns
Guest
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| Posted:
Tue Nov 23, 2004 10:44 pm Post subject:
Re: How to adjust RPMs |
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| Quote: | I have a 1995 BMW 518. The engine runs at about 1100 when idling. I do
a lot of slow city driving and feel that this rpm are a bit high for
optimum fuel consumption.
Two questions
1. What is the recommended rpm when idling?
|
I think it's 650 for the M43 1.8.
| Quote: | 2. How can I adjust rpm - the accelerator cable is adjusted to
maximum?
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First, make sure your floor mat's not touching the accelerator. Happened
on a mate's 520i :-)
You can't adjust the rpm as it's computer controlled.
If it's high you have:
a badly adjusted throttle position switch
a vacuum leak
the car still think it's in cold start mode due to a bad temp sensor
(I'm not certain that affects the idle rpm).
--
Who needs a life when you've got Unix? :-)
Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland
Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage!
Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html
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Louis Carroll
Guest
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| Posted:
Tue Nov 23, 2004 10:52 pm Post subject:
Re: How to adjust RPMs |
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Thanks Russ..when engine is started revs hover just below 1000. As the
engine warms up they climb to 1100. When warm (at 1100) it drops maybe
back to 1000 if I put on lights, fan and radio.
Rgds
Louis |
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