I have replaced the spark plugs with the injectors. I forgot to report that.

I changed out the sparkplug wires with a new OEM replacement set one year ago after I ripped one of the wires changing the plugs.

The ignition cap and rotor are original.

Should I also think about the fuel pump relay at this point?

How much do these items typically cost?

I will buy new parts and only OEM of course since the car is in exceptional condition after I have taken care of those door dings that bubbled earlier this year.

I would just like to know what to look for to diagnose old parts that may not be operating up to spec any more.

Thank you for reading my posts and I look forward to any additional responses. It has been a great help so far especially reducing my own second guessing.

Many thanks,

Michael McKinney

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1989 300CE - 269,000 km
1994 SL600 - 59,000 km