[W126 Coupe] Suspect OVP relay (old subject-sorry)

[Terry Ratliff]

Check the ICV (idle control valve) valve.Terry

 

Best Regards,

Terry C. Ratliff

Clearwater, Florida

 Phone: 727-330-8683

eMail: Terry at MyMBSEC.com

Web site:  <http://mymbsec.com/> http://MyMBSEC.com 

Support The MyMBSEC.com Web Site.

Switch your <http://www.mymbsec.com/buy-terry-a-beer.htm>  wireless service
to:

 <http://www.mymbsec.com/buy-terry-a-beer.htm> 

Does Your Cell Phone Company Pay You?

If Not, Visit: http://ibmc.com <http://ibmc.com/> 

 

  _____  

From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Vance Rowley
Sent: Thursday, June 11, 2009 12:05 PM
To: Mike R.; 'Mercedes Coupes Mailing Lists'
Subject: Re: [W126 Coupe] Suspect OVP relay (old subject-sorry)

 

Hi Mike,

 

  Yes, the fuse is OK, and the voltage with the engine running seems OK at
13.9v. Also, thanks very much for the offer of the OVP, but unfortunately, I
am located in the UK (although I do sometimes visit Vegas each year in
November during the Global Gaming Expo), sadly I don't think I will be going
this year, and of course I am hoping to get the problem sorted before then
anyway. Thanks again for the offer, all help is always appreciated. I must
remember to look you up next time I visit. 

One more thing is, I have noticed there are a few variations of the OVP
(different part no's, some with one fuse, some with two), but from what I
can tell from the little circuit diagram on the side of my relay (201 540 32
45) and comparing it with the photos of others I have looked up on the net,
it doesn't look as though it makes any difference as long as it will fit
into the socket. In fact when I looked up my part number on a UK based parts
supplier, it returned part no 201 540 37 45, one with two fuses and a red
top with an additional circuit which would be redundant if plugged into my
socket. From what I can tell, this should be fine as the first circuit looks
the same. Am I correct about this?

 

Cheers,

Vance

----- Original Message ----- 

From: Mike R. <mailto:mramay at att.biz>  

To: 'Vance <mailto:vance.rowley at tiscali.co.uk>  Rowley' ; 'Mercedes Coupes
Mailing Lists' <mailto:mbcoupes at mbcoupes.com>  

Sent: Thursday, June 11, 2009 2:44 PM

Subject: RE: [W126 Coupe] Suspect OVP relay (old subject-sorry)

 

Have you checked the fuse in the OVP? A blown fuse will create the high idle
(BTDT. 

 

What's the battery voltage with the engine running? When my ABS & Battery
light come on at the same time, my alternator has died and the battery
voltage is too low.

 

Where are you located? I think I have an OVP you could borrow/buy.

 

Later,

Mike Ramay

(702) 494-8056

Las Vegas

 

From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Vance Rowley
Sent: Thursday, June 11, 2009 5:56 AM
To: Mercedes Coupes Mailing Lists
Subject: [W126 Coupe] Suspect OVP relay (old subject-sorry)

 

I know this subject has been covered many times, but there doesn't seem to
have ever been any exact diagnoses, and appears to be some confusion on the
subject.

The symptoms are as follows on my 1991 560 SEC (Euro).

 

1. Takes a long time to start, (where it used to start on the first couple
of turns of the engine.)

2. High idle, around 1400-1600 rpm (and sometimes creeps up).

3. ABS and ASR warning lights on all the time.

4. Hesitate slightly when you hit the gas. (more noticable when you rev the
engine in neutral)

 

This I believe is the typical (limp home) mode. I have seen these symptoms
on many forums as well as our archives, but never usually all at the same
time. Also, these symptoms that other people have are usually intermittent,
where mine are permanent. Anyhow, there are quite a few different diagnoses
for these symptoms around on the net, but mostly point towards the
overvoltage protection relay. I have of course checked the fuse in the top
of the relay and is OK, as well as making sure the pins are clean, which of
course they are. Have even tried one tip to disconnect the battery overnight
to try to reset the system. No joy.

 

My main question (before I purchase a new OVP relay) is, can anyone confirm
that this is the problem for sure. Also, I unplugged the relay and started
the car and all the above symptoms remain the same without the relay even
plugged in. This got me thinking. Does this mean if you unplug the OVP relay
on a known good working car, that you will get all the above symptoms? This
would surely confirm the diagnoses and was wondering if anyone has done it.
If so, please let me know, as well as any other tips or hints.

 

Thanks,

 

Vance.

No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.339 / Virus Database: 270.12.62/2168 - Release Date: 06/10/09
18:30:00

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.pairlist.net/pipermail/mbcoupes/attachments/20090611/3a1902fe/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 3697 bytes
Desc: not available
Url : <http://www.pairlist.net/pipermail/mbcoupes/attachments/20090611/3a1902fe/attachment.gif>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 3734 bytes
Desc: not available
Url : <http://www.pairlist.net/pipermail/mbcoupes/attachments/20090611/3a1902fe/attachment.jpe>