Engine cranks but no start

[SWISS MIKE]

Hello 500E family,

Hope somebody can help me get my 1992 500E running.
Car was in storage for the last couple of years as a nonoperation, I would drive the car once/twice a year for a couple of miles.
Now I am ready to put the car back on the road. I replaced the front brakes, brake fluid flush, engine oil and filter change and replaced the brake light switch due to ABS code.
Engine cranks but doesn't start. Battery is good, fuel pressure at 3.5 bar, added 7 gallons of fresh gas. I get spark on the plugs, removed both distributors and spark plugs. Everything is looking good. Performed compression test, all 8 cylinders are between 180 to 195 PSI. With starter fluid, engine almost starts...
Any idea what to check next? Could a new (faulty) brake light switch cause a no start?

 

[gsxr]

Faulty brake light switch will NOT cause a no start condition.

If you squirt starting fluid down the MAF and it still doesn't start, it's not fuel supply either.

So, it's probably not getting spark. Not sure how you are testing for spark. Any fault codes? All fuses good including the ones in BM/GM (CAN box)? Do you have access to SDS / HHT-Win?

 

[SWISS MIKE]

GSXR,

I used a cheap in-line ignition spark tester. I check two different cylinders, one on each bank. I get spark on both sides.
All the fuses are good, including the once inside the BM/GM box.
I don't have access to SDS anymore. I worked for the Mercedes Dealer for 10+ years, but that was a while ago.
All I have is the blink code tester.