[W126 Coupe] A sudden loss of forward motion

[Dick Spellman]

Hi Shin san:

There are many things that need to be checked to troubleshoot that kind 
of problem.

In no particular order...
check fuel pressures as it's possible the fuel filters need replacing or 
one of the two fuel pumps are getting weak.  You do not describe a total 
but temporary loss of power like the engine just shut down, so probably 
not the fuel pump relay.

check ignition system...physically inspect the interior of the cap, 
rotor for pitting, traces of carbon,  severe wear.  When was the last 
service of these components and the plug wires and spark plugs?

It would help to know mileage on the SEC, mileage at documented last 
service and what the service entailed. Are there any other symptoms you 
noted?

Anyway, these are a few checks I'd suggest you make.

Regards,
Dick

shinzbox at aol.com wrote:

> Hello, I hope evreyone had a great Thanksgiving. I am new to your site 

> but have had a few Mercedes in my life including a fairly new 

> acquisition, a '91 560SEC.

>

> After a wonderful Thanksgiving dinner at our in-laws in Newport Beach, 

> we headed home on the 405 towards L.A.  While cruising in the HOV lane 

> at 80mph we experienced a sudden loss of forward motion like the car 

> was braking itself for a moment, then it resumed like nothing 

> happened.  Then it did this again a short while later then again after 

> that but this time like I had stepped on the brake. Since my speed 

> reduced from 80mph to about 55mph, the cars behind us were coming up 

> real fast, so we illegally changed lanes out of the HOV and went all 

> the way to the slow lane. Now at around 65mph, this never occurred again.

>

> I was not using the cruise control and I did not have a drink tonight 

> because I knew the CHP was out in force.  I do not believe it is 

> electrical because the lights did not weaken during this happening so 

> it must be a fuel delivery or computer problem. I hope it could be 

> just the fuel filter or clogged injection nozzles or dreaded fuel 

> distributor. What's your guess? and thanks for the help.

>

> Shin Takei

> SLSAMURAI

>

> '91 560SEC

> '94 E320

> and 1989806500151

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