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

[eurotech1 at charter.net]

Hey Richard,

 Your economy gauge is basically just a vacuum gauge ( reads high vacuum at idle, vacuum decreases as throttle is opened ), could indicate a vacuum leak somewhere if you're experiencing sharp fluctuations in readings at a steady throttle position.

                   Christopher Huffine
------------------------------------------------------------
> From: "Shayegan, Richard" <rishayegan at davidson.edu>
> Date: 2005/01/22 Sat PM 04:00:01 EST
> To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
> Subject: RE: [W126 Coupe] 1- doesn't start in cold 2 - oil pressure strange
> 
> 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.
> 
> 
> The MB Coupes Website!
> W126 SEC Mailing List
> Postings remain property of MB Coupes, L.L.C.
>