[W126 Coupe] Shaky Start!!

[Dick Spellman]

Hi Camran:

On the coupe with such low miles, why not try a can of BG-44K to see if 
you can clear any build-up on the injector nozzles.  The injectors and 
or throttle plate may just be gunked up.  One tank on BG-44K will either 
clear things up or not.  Could also be one or more injector seals has 
got a leak but, that would give you a miss at idle once warmed up. On 
the 420, I'd say it's due for injectors.  I'd also check the fuel 
distributor control piston seal.  It's simple and you can check it visually.


Start the engine for a minute or so to get system pressure up.  Turn 
engine off.  Then just grab a flashlight, remove the air cleaner and 
fully depress and hold the air flow meter plate downward.  While it's 
being held down, shine the flashlight in there towards the hinge (pivot) 
side and see if after a few seconds the area looks wet (shinny).  If dry 
you are all set.  If wet, you need the $1 seal to be replaced.

Regards,

Dick

Camran Nassiri wrote:

> Thanks Rich for your info.  I have decided to get the injectors changed and 

> solve for this problem.  I do appreciate your response.

>

> Camran

> 90 560SEC, 91 420SEL

>

>

>   

>> From: "richard jaffe" <rsjaffe1 at msn.com>

>> Reply-To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>

>> To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>

>> Subject: Re: [W126 Coupe] Shaky Start!!

>> Date: Tue, 6 Mar 2007 16:08:05 -0500

>>

>> I had the same problem and did all the same things you mention also to no 

>> avail. I just recently replaced all 8 fuel injectors, seals, holders and 

>> air tubes. The car now fires up immediately and is smooth as a baby's rear 

>> end. The old fuel injectors were clogged and leaking badly.

>>

>> Rich Jaffe

>> 85 500 SEC Euro  259K

>> 83 300 SD   192K

>>   ----- Original Message -----

>>   From: Camran Nassiri<mailto:mbzman560 at hotmail.com>

>>   To: mbcoupes at mbcoupes.com<mailto:mbcoupes at mbcoupes.com>

>>   Sent: Monday, March 05, 2007 11:16 PM

>>   Subject: [W126 Coupe] Shaky Start!!

>>

>>

>>   I have a 1990 560SEC (52K miles) and a 1991 420SEL (110K miles), when I

>>   start both cars the the engine shakes for a few seconds (maybe 15 

>> seconds)

>>   before it settles down and rides fine.  I have replaced the ignition 

>> wires,

>>   plugs, rotor and cap to no avail.  I am not sure if this is caused by 

>> fuel

>>   injector drain or what.

>>   Any advice as to how to solve this problem; or, any advice as to 

>> alternative

>>   way of starting the car to avoid the shakes (like turning on the key for 

>> a

>>   few seconds before crancking the engine)?  Any help is appreciated.

>>

>>   Camran

>>

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