I have a W140 with M104 engine.

I have a, what I suspect, a injector leak as the #5 injector have black oil all around the outside (just by looking) while all others are just dust.

I will properly get a mechanics to replace the injectors as its a 1992 car. However I read that there are other plastic, housing, hose, vacum that should be replaced as well.

Can someone explain what I need to tell the mechanic to replace?

Any idea of cost?

Thanks

Hagies thanks for your reply. Truely value your help in this regards.

Jim, thanks for your note. Yes without you pointing the point out, I didn't realise I posted in the wrong board. Mine is a "Petrol" engine and thanks for correcting me in this regards. Still running very HAPPY with your excellent cool harness.

What Hagies point out is true, I properly should't replace things because of its a 1992 car. In fact I don't seem to have any of the "Bad Injectors" symptom as discussed in detail in this web site. My idle speed is around 600 rpm and I don't get any vibration nor any hestitation. (I think these are the symptom)

In fact I found this "so called" leak from visual inspection rather than idle hestitation or poor start problems.

Out here where I am, the mechanics will always say "replace the lot" I wanted to get some opinions from expert here in regards to what really should be replaced. I hate to replace something that does not need replacing at all. Worst still, the mechanics will charge $$ labor with no value add!!

OK my problems?? just a visual leak, I think. One of the injector, #5, has black oil all around it and in areas near-by including the harness connection. I am worried that this may lead to bigger problems and thus want to get a mechanic to fix it ASAP. Should I not worry? How involve is this? Should I post a picture?

All help are greatly appreciated. Thanks to all of you!