1988 420 sel no start
 

have 1988 420 sel the car will not start. have spark ,fuel at injectors, checked compresion all cylinders are at 120 psi. anybody have any ideas?

Won’t start in neutral?
When did it last start?
Does engine crank?
...
More info please.

more info on 420 no start
 

purchased car from repo lot. was not running when purchased. i checked spark fuel and compresion do not even get a pop was not sure where to go from here. any help would be great.

So the engine doesn’t turn. Any sounds at all? Lights on dash, headlight, radio ok?

engine turns over and everything on car works just will not fire own two others, 1968 280s, and 1988 560 sel, have never had this type of problem

I just checked cylinder compression for 124's, it ranges from
(in psi)-------new/min.
M103---------188/152
M104---------210/174
M119.974-----210/174
M119.975-----217/181
Diesel's-------465/260

----------------------------- ?

also have this



from: MERCEDES-BENZ E-Class Owner's Bible 1986-1995

Problem M103 engine? (is not your engine but is all I have access to)
Does not start.

Possible cause, suggested repair
a. Ignition control module malfunction.
Install Siemens ignition control module.

b. Formed hose between idle speed air valve
and air guide housing fallen off due to backfire. (?)
Test air flow potentiometer position.
Check rest position of air sensor.
Center air flow sensor plate.
Check rubber hose between idle speed valve
and air guide housing for tight fit.
Replace if worn or swollen.

sorry I don't know more about your car.

thanks for your help i will look into those items again thanks for your time

Check back. Someone much more knowledgeable might chime in over the next 24 hours.

Good luck.
Marty