this is very frustrating, when i drive my 560sel if i am going 30mph or faster and i come to a stop like at a light it will die. what in the world could this be? i have over 306,ooo miles on the car.

Many things to check. Check them respectively: (Assuming no surge while acceleration)

1. Fuel pump relay
2. Fuel distributor alignment
3. EHA Valve (the black object located on the fuel distributor)
4. Spark plugs/wires
5. Ignition rotor

Most likely it's a fuel delivery issue.

__________________
Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D

380SE 1984 <------- Totaled by flipping accident
300SE 1988 <------- Sold
Volvo S70 2000 <---- 4 family
Opel Omega 2002 <-- 4 family
560SEC 1989 <------ Sold
560SEL 1990 <------ Sold
560SEL 1991 <------ 4 my mother
560SEL 1989 <------ Sold
600SEL 1992 <------ Current

http://search.ebay.com/_W0QQsassZkhazenzcc

fuel pump relay does not feel hot to the touch,new plugs and wires. what do you mean by fuel dist adjustment?

The fuel dist. is adjustable by a special screw driver (I don't know what they call it in English - Alan-key maybe?) This to adjust fuel/air mixture. Must by done by a mechanic.

__________________
Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D

380SE 1984 <------- Totaled by flipping accident
300SE 1988 <------- Sold
Volvo S70 2000 <---- 4 family
Opel Omega 2002 <-- 4 family
560SEC 1989 <------ Sold
560SEL 1990 <------ Sold
560SEL 1991 <------ 4 my mother
560SEL 1989 <------ Sold
600SEL 1992 <------ Current

http://search.ebay.com/_W0QQsassZkhazenzcc

i understand so saying my mixture is too rich or too lean at the present time?

Yes it could be.

__________________
Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D

380SE 1984 <------- Totaled by flipping accident
300SE 1988 <------- Sold
Volvo S70 2000 <---- 4 family
Opel Omega 2002 <-- 4 family
560SEC 1989 <------ Sold
560SEL 1990 <------ Sold
560SEL 1991 <------ 4 my mother
560SEL 1989 <------ Sold
600SEL 1992 <------ Current

http://search.ebay.com/_W0QQsassZkhazenzcc

Does it refire immediatley after dying or does it hesitate to catch?
If you brake with 2 feet (keeping pressure on the gas) does it still stall?
Does it run rough while decellerating before dying? Does it die at the stop or while coming to it (while applying brake pressure?)
Can the car idle in park? If so, if you pump or hold the brakes, does it die?

__________________
Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k

This sounds like a possible sulfated = old battery.

The lead sulfate falls off the battery plates, builds up in the bottom, and shifts, shorting the battery plates during severe deceleration..

If the battery is over four years old = replace it.







Have a great day.

__________________
ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

you could have a short in the tail lights wiring in trunk - seen this before not on a benz tho - jz

Could be a crack in the circuit board of the fuel relay. If so buy new relay or repair the crack with solder and iron. Momentum while braking can cause crack to open and relay stops sending fuel to cylinders. When stopped there is no longer momentum force to circuit board and crack closes again , electrical flow resumes and engine becomes functional once more.

Search my past posts. I have explained repair procedure a dozen times.

Earl

__________________
Earl



1993 190E 2.3
2000 Toyota 4x4 Tundra

it just dies on severe deaccleration. it will start right up in neutral. it will also start up i can put it in reverse but when you push the gas pedal nothing, no power no rpms nothing then all of a sudden you can squell the tires in reverse when it catches "my term"