1991 300ce m104.98 has intermittent start problem - it doesn't matter cold or hot. It's about 50% start /hard start. This comes with shaky idle. I've so far replaced rotor, distributor, wires, plugs, regulator, belt. Battery tests good, starter good, alternator good. Would fuel system be next to check/replace?

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2017 - 1991 Smoke Silver 300ce Tan Interior
2014 - 1993 Blue 190e 2.3 Tan Interior
2012 - 1988 Blue 300ce Grey Interior
2009 - 1989 White 300e Grey Interior

Can you check fuel pressure? Might be a tires accumulator.

Sixto
98 E320s sedan and wagon

I do not access to a pressure gauge. Would the accumulator only affect warm starts?

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2017 - 1991 Smoke Silver 300ce Tan Interior
2014 - 1993 Blue 190e 2.3 Tan Interior
2012 - 1988 Blue 300ce Grey Interior
2009 - 1989 White 300e Grey Interior

Many owners have solved this problem by replacing the fuel pressure regulator.

Sent from my XT1080 using Tapatalk

Search for a thread started by me: "'Fuel Accumulator Failure Analysis". You don't need a pressure gage. There is a simple test you can perform on the car to determine if the accumulator has a leaky internal diaphragm that shorts fuel back into the tank to pump feed hose.

If the diaphragm leaks, fuel pressure will rapidly bleed off after engine shutdown, and it will take considerable cranking to build pressure for the next restart. This can happen hot or cold, and it can be an intermittent problem, but will become more frequent with continued use.

Many FPRs get replaced when the real problem is the accumulator. AFAIK know the FPR has no organic internal parts, but the accumulator does, which are subject to both deterioration with time and cracks due to repeated stress. You can clearly see the cranks in the photos I posted in the above referenced post that caused the internal leak.

With the new accumulator, my car immediately returned to normally quick cold and hot starts, and it's easy to change.

Duke