[W126 Coupe] 1- doesn't start in cold 2 - oil pressure strange

[Shayegan, Richard]

The battery is the official benz battery and is about 2 months old, has
no leaks. Is there a way to check the cold start sensor short of
replacement? As for the oil, it looks clean, has 1500 miles on it, of
which 1200 are highway. Also, I've noticed some more things. The oil
pops backup because the engine does a quick surge (just once, not picked
up by the rpm gauge, but I can hear and feel it). The engine surge is
also accompanied by the fuel economy gauge going from the left end to
1/6 the way to the right and back to the left end. Also, sometimes when
I stop the engine won't surge, and the oil pressure will hang out at
about 2. When this happens, the economy gauge doesn't peg at the left
end (like it should at idle, and most of the time does), but rather it
will stay about 2 economy-gauge-needle widths to the right. I remember
when I once mentioned a problem Jonathan asked what the economy gauge
did at idle, so I'm thinking maybe this indicates what the problem is?
Thanks,
Richard

-----Original Message-----
From: mbcoupes-bounces at mbcoupes.com
[mailto:mbcoupes-bounces at mbcoupes.com] On Behalf Of Sharan Bains
Sent: Saturday, January 22, 2005 3:04 PM
To: mbcoupes at mbcoupes.com
Subject: RE: [W126 Coupe] 1- doesn't start in cold 2 - oil pressure
strange

Richard,

Either the cold start sensor (4-pole switch) on the inlet manifold is
not 
functioning correctly or you have a weak battery, which in turn is not
able 
to support the cold start system components.

As for the oil sender, may just be dirty oil. Try changing the oil and
oil 
filter and check again.


talbir





>From: "Shayegan, Richard" <rishayegan at davidson.edu>
>Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
>To: <mbcoupes at mbcoupes.com>
>Subject: [W126 Coupe] 1- doesn't start in cold 2 - oil pressure strange
>Date: Sat, 22 Jan 2005 14:14:25 -0500
>
>2 things I've noticed as of late. When it's cold out (not super cold,
>but like 35F and lower) the car doesn't like to start. First the
starter
>will spin free since it didn't engage (the strange part is to get the
>starter to stop, I have to turn the key all the way to the off position
>and then take it all the way back to the start position - jounce bounce
>the key off the start position basically), then on the next attempt (or
>whenever it finally does engage), I'll have to crank it for a good
while
>to get the engine to stumble to life (to get the rpms up to a
>non-stumbling speed I have to give it a little gas). After that it's
>fine. It doesn't do this if it's warm out nor if it's cold out but the
>engine is warm. Any ideas?
>     The second thing is that when I hit the brakes (like to slow down
>for a red light), the oil pressure will drop to about 1.5 and then when
>I complete my stop it will come back up to the usual 2.4-2.8 it does at
>idle. I know technically even if it stayed at 1.5 it's ok, but it never
>did this before so I'm guessing something's wrong. The oil level is
>fine. Any ideas about this one?
>Thanks,
>Richard
>The MB Coupes Website!
>W126 SEC Mailing List
>Postings remain property of MB Coupes, L.L.C.


The MB Coupes Website!
W126 SEC Mailing List
Postings remain property of MB Coupes, L.L.C.