The car spent the last week at the mechanic. Removed starter, Checked Flywheel, replaced Thermostat. Observed car for 3 days.

Yesterday morning at start the whack happened again this time not as loud and car started along with the sound. (Didn't need to shut down or grind the Starter.) Still have the miss at start up does not last as long now maybe 10 seconds.

Car runs great following the "bump" at start up and confounds me at this point.

The Timing chain was replaced along with Guides etc. at 130,000. The idiot who replaced it bent a valve and I did a top end at 130,000 miles as well.

No leaks found anywhere. Coolant and cooling system pressure has been reduced with new Thermostat. No Garage floor coolant leaks anymore. A positive.

I'm beginning to believe that it is a chain guide issue. We look at it all the time, due to my paranoia. Every time I get a repair we chack the chain etc. That's why I am doubting the chain as a problem, but I'll get it reviewed one more time.

All help would be appreciated here. By the way, the flywheel on the 1988 560SL does not have magnets. That was bad info from someone.

I'm gonna check the "Search" one more time and see what we have. All points of view graciously accepted! Thanks!

P.S.When reviewing the "chain" what are the parts that if something was awry on the chain, or guides, or whatever to check that I may have overlooked?

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1988 560SL
Black Pearl/Palamino