Titanium tetrachloride makes smoke as it evaporates. We used it in the wind tunnels to visualize flow. We'd dip a swab into some and stick it in the airflow and as it evaporated it made white smoke, easily seen. It lasted a while. Not sure where you get it now, I guess the webs would be your friend.

--R



On 6/5/15 5:25 PM, Dan Penoff via Mercedes wrote:
Got the car back from the trusted indie shop.  They spent two hours of 
diagnostic time on it and found that the MAF is probably bad and there are a 
number of vacuum leaks in all of the lines that run across the top of the 
engine and probably the boot at the bottom of the MAF.

This is good news, as we know the wiring harness is good and they confirmed 
that.

I just happen to have a spare MAF that someone gave me for free for the S420, 
and even better, it’s the SAME part on the S500.  Woo-hoo!!

The car comes home tonight, after which I’ll survey the vacuum lines and elbows 
that have to be replaced and make a parts list for my dealer parts guy on 
Monday. I’ll have him VOR (overnight) the parts so we have them on Tuesday and 
Tuesday night we’ll reassemble everything and get the boy back in his beloved 
car.

I knew the vacuum fittings on the top of the engine were getting hard and 
brittle as they’re known to do, but I didn’t think any of them were leaking 
yet.  I’m going to dig around on the internet and see if I can find the plan 
for a DIY smoke tester - this is something that is a big help and could use 
occasionally.

More as I know it….

Dan
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