Folks,

OK so for my near daily concern with the '85 I have landed on a random engine noise that occurs only when cold.

- At one particular accelerator pedal position (2k rpm ish) , it sounds like something in the engine bay is loose or an injector is nailing. Not rhythmic or constant. When it starts it will happen fast for like 3 to 5 times, then stop as I move the pedal higher or lower.

- It goes away progressively as the engine warms up, until it is non-existent above 80C.

- This has occurred before and after I swapped in new injectors from bgkast, so Im fairly sure its not an injector issue.

I am going to poke around at it tomorrow. I have been ignoring it while I have worked on other stuff over the past few months.

Any ideas? Im hoping this sparks a 'oh, i had that, its this' response from someone Vac pump? Loose EGR or ARV?

Thanks, as always!
dd

__________________
-------------------------------
'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car