1990 420sel won't start!
 

:silly: long trip and a stop at MB dealer just wasn't rewarding. The dealer ship reset the fuel and it ran well for ten miles,then began to run rough and stall,when we spent some time on the side of the road it restarted long enough to get us home.Now it will start four ten or fifteen seconds,and stall then you can crank on it all you wish,But it isn't going to start,Any thoughts?
Im thinking in electrical problems.
just-n-time

How is the fuel filter/accumulaor/pump? I would guess one of those will cause your problem but not %100. When you turn the key all the way before you start the car, do you hear a faint "hissing noise"? If you do not then check your fuel pump or all relays and fuses

you need
1. fuel
2. spark
3. air

check the basics.... if one is missing, concentrate on that system.

:eek: the fuel pump's are new,as per MB. The fuel filter is too per myself,
THe fuel distrabution unit is new per MB.this car sat for a couple years,varnish got to it. I am trying to trace down problems in relays as we speek. thanks for the input. just-n-time;)

What yr. is your 420-SEL ?

Is the fuel pump relay new?

fuel pump relay
 

The car is a 1990 420sel and yes the relay was the fourth item r/r-d, j-n-t

It would seem a lot of fuel delivery items have been changed.

If the car sat idle for a long time, I suppose I'd suspect the injectors.

Personally, I'd find a legitimate independent tech and explain what's been done and pay him an hrs. labor or so for some diagnostic work.

My 2 cents.

My paroblem was with "hot" start. It would take a lot of cranking and holding down the gas pedal and then sputter and cough but finally would start. Turned oaut to be the fuel accumulator.

Thanks mike,I live in central Louisiana, New Orleans is 250 miles away for the good shops,or at least those reported on,havent found any close in.
just-n-time

ovp
 

have one on the way from phill, need to get her up to idel so I can check the rest of the item's to be inspected.:silly: just-n-time

:mad: Maybe I can get the car up,soon.Miss Debbie and I enjoy our little rides in this great car. Thank you all for any help, just-n-time:D

ovp
 

well gang the ovp,has arrived,after uncovering the car I quickly plugged it in and I was listening to that beautifull per,then it began that ever so slight dip in the rpm,so I am sure of a vacuum leak,thought I would travel to the highway and ride a few miles,well its 1 mile to the highway went maybe another mile and it quit. The temp was at 80c and I had a flashing ABS, after some 30 min. It started and home we came,only I kept my foot on the gas to keep the rpm's up,and got a check Eng lite for my efforts. NEED MORE THOUGHT'S. just-n-time:dizzy2:

parts listing
 

:rolleyes:
Well now this may take a while, 1990 420sel fuel system parts that are new,
Fuel gauge sender
both fuel pumps
fuel filter
fuel relay
fuel distrbution block
fuel spray nozels
ovp, oxygen sensor The car now will start and idel just fine,untill it reaches 80c then it starts to serge I am leaning towards a vacuum leak for this problem. so I will look for info on the vacuum system,Eng,and probably emissions.:pirate: I know I am asking a lot:wacko: just-n-time:)

Fuel Accumulator
 

:confused: What dose the fuel accumulator do? :rolleyes: I looked it up but Im not shure about it!:dizzy2:

Idel controll unit
 

Can the Idel controll unit cause speratic proublems and cut the engine to quit?:silly: