Friends,
I am still troubleshooting my 1991 420SEL. My brother is helping me as I am not mechanically inclined, so please forgive me if I misstate anything.
Here is the list of things I have done so far.
- Replaced fuel pump relay, overload relay
- Replaced distributor cap/rotor
- Replaced fuel/air filters
- Temporarily replaced fuel distributor
- Replaced battery
- Checked fuses in the engine compartment
- Temporarily replaced ignition box near driver side wheel
It seems to get fuel through the fuel distributor. The fuel pump sounds like it's working when I turn the key. No leaks, no smoke. We get spark at the cylinder. Timing seems to be in synch. Gas tank is 3/8 full. Never any backfiring or hesitation in the past. Starter seems to be working fine; engine tries to turn.
*Sometimes was hard to start (before new battery). *Cruise control never worked for me. *When we try to start it, sometimes it makes loud knocking but doesn't start. *Initially stopped on the road after I floored it at 15 or 20 miles an hour to enter a residential street, no hot-rodding. Has sat in my driveway for one year, unable to start.Thanks, Ron in Salem OR