[W126 Coupe] Engine vacuum oddity

[Mike R.]

The only connection I can envision is the alternator. High speed fan is a
very large electrical load and either the fan is going bad, pulling huge
amounts of current thereby loading down the alternator, or the alternator is
going bad and that big load makes it work way too hard, trying to slow down
the engine, thereby affecting vacuum levels. Check voltage on the alternator
during different conditions.

 

Later,

Mike R.

(702) 494-8056

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From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Shayegan, Richard
Sent: Friday, July 21, 2006 12:08 PM
To: Mercedes Coupes Mailing Lists
Subject: RE: [W126 Coupe] Engine vacuum oddity

 

Actually, I first noticed this with the windows open, so that's not it.

Richard

 

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From: mbcoupes-bounces at mbcoupes.com on behalf of Jim Ham
Sent: Fri 7/21/2006 12:46 PM
To: Mercedes Coupes Mailing Lists
Subject: Re: [W126 Coupe] Engine vacuum oddity

Do you suppose that cabin pressure has something to do with this? Why don't
you try it with a window open to see if it still happens.

Regards,

Jim Ham

At 03:53 PM 7/20/2006, you wrote:
>Any idea on this one? When I turn the fan blower to high (i.e. EC is on,
>fan is on low, then I hit the fan speed to high), the economy guage dips
>when I'm at idle (i.e. I'm idling in D with my foot on the brake and the
>economy guage goes off pegged just because I raised the fan speed). Any
>idea how the two might be connected?
>Thanks,
>Richard
>The MB Coupes Website!
>W126 SEC Mailing List
>Postings remain property of MB Coupes, L.L.C.

Porcine Associates
+1.650.326.2669
www.porcine.com

The MB Coupes Website!
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Postings remain property of MB Coupes, L.L.C.

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