Author Topic: No spark HELP !  (Read 298 times)

Kissel

  • Newbie
  • Posts: 11
  • W116 Enthusiast
No spark HELP !
« on: 16 December 2020, 06:21 AM »
I am sure this is simple or gone over already but I have a 75 450se and it ran great now I can’t get it to start I replaced the coil distributor cap , rotor and plugs. I swapped out my icu with another car and it worked fine. I get one spark from the wire coming off of the coil but not on the plug wires. Going a little crazy any help would be appreciated.
 
1965 red 230sl
1972 silver 350sl
1973 gold 350sl
1975 blue 450se
1971 green 280se
1967 green 250s
1977 tan 450sl

Inshan

  • Enthusiast
  • *
  • Posts: 17
  • W116 Enthusiast
  • Location: Orlando, FL
Re: No spark HELP !
« Reply #1 on: 17 December 2020, 09:47 AM »
If you get good spark on the coil wire going into the distributor but no spark on any of the plug leads, then your problem lies between the cap and rotor.  Check for a cracked rotor.
1980 300SD

Kissel

  • Newbie
  • Posts: 11
  • W116 Enthusiast
Re: No spark HELP !
« Reply #2 on: 17 December 2020, 11:13 AM »
Thanks , I tested and replaced the rotor and cap. ( It looks like I only get one quick spark from the lead from the coil too not sure if that is right either) I don’t know if my points can be burnt out ?
1965 red 230sl
1972 silver 350sl
1973 gold 350sl
1975 blue 450se
1971 green 280se
1967 green 250s
1977 tan 450sl

adamb

  • Vintage
  • ***
  • Posts: 607
  • 1977 450SEL6.9
  • Location: London, UK
Re: No spark HELP !
« Reply #3 on: 17 December 2020, 12:32 PM »
You don't say if the car ran fine and then suddenly died or what are the symptoms? Why did you replace the rotor and plugs?

I recommend doing some basic diagnostics on the coil first. The ignition amplifier may have failed. Do you have a spare handy?

Kissel

  • Newbie
  • Posts: 11
  • W116 Enthusiast
Re: No spark HELP !
« Reply #4 on: 17 December 2020, 01:01 PM »
I have a few cars here I swapped out the coil wire , the ignition control unit, cap, rotor ballast resistors and all work fine 
1965 red 230sl
1972 silver 350sl
1973 gold 350sl
1975 blue 450se
1971 green 280se
1967 green 250s
1977 tan 450sl