Hi everyone.

 

Sometimes when I start my 1989 DL there is a clicking that goes goes away when I rev the engine just a bit.  It seems to stop completely once the engine has been running for a few minutes.

 

I would describe is as a light but noticeable clicking/tapping.  There's no difference in the way the engine runs when it happens.  

 

Any thoughts on how to determine the cause?

Perhaps very mild Tick of Death?  Goes away with revs as the oil pressure rises?

 

Not to worry, TOD is a joke.  There is something wrong if your EA82 doesn't sound like a cross between a sewing machine and a Russian agricultural machine on its last legs.

Sounds like mild tod. It's a sticky valve lash adjuster. Sometimes it can be fixed by replacing the oil pump seal. Sometimes cleaning the lifters. Make sure you run 10w-40 oil.