Re: [MBZ] S500 Mystery Solved

2015-06-14 Thread Dan Penoff via Mercedes
Actually, it is normal in this climate.  I found on several occasions where the 
car was parked for 3-4 days (or more) that condensation would sometimes collect 
in the distributor caps, but a good hard drive would burn it out.  This was 
especially common when my son had the car at school, as the parking structure 
he parked the car in was a block from the waters of Tampa Bay. This, coupled 
with the temperature swings and humidity, added to being parked in a shaded 
area on concrete, created condensation on and under the car regularly.

The caps aren’t tightly sealed, and being at the front of the engine and in the 
airflow to some extent don’t get terribly hot compared to the rest of the 
engine compartment.

Numerous references to the same on the W140 Benzworld forums, too. Here is just 
one example of many:

http://www.benzworld.org/forums/w140-s-class/2300802-distributor-cap-question.html#post11537146

The amount of condensate was very small, but it was enough to affect the spark.

Dan

 
 On Jun 14, 2015, at 8:12 AM, Jim Cathey jim.cathey...@gmail.com wrote:
 
 Not solved.  Where did all this moisture come from?  That's
 not normal.  Is the crankcase ventilation plugged up such that
 a little bit of the blowby was coming 'round the shaft?  Did
 you hose down the engine a little too vigorously?  Ford any
 streams?  Buy the car in Florida, 'cheap'?
 
 -- Jim
 


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Re: [MBZ] S500 Mystery Solved

2015-06-14 Thread WILTON via Mercedes

ATTABOY!

Wilton

- Original Message - 
From: Dan Penoff via Mercedes mercedes@okiebenz.com

To: Mercedes List mercedes@okiebenz.com
Cc: Dan Penoff d...@penoff.com
Sent: Sunday, June 14, 2015 6:01 AM
Subject: [MBZ] S500 Mystery Solved


So the issues finally come to an end, and Im a little put off by my 
stupidity...


Took the car to my trusted indie shop. After two hours of troubleshooting, 
they came back and said the MAF was sketchy and all of the hoses on the 
top of the engine were questionable. Fine. I drive it home and it's still 
running poorly at low RPMs, especially when taking off form a stop. Get 
above 1500 RPM or 20 MPH, runs like a top. Hmm.


So I get a rebuilt MAF from MBUSA along with a full set of hoses for the 
topside of the engine.


Put everything on the car yesterday morning (and boy, were those hoses 
bad!) and the car still runs like crap. Dang it!


After my first test drive, I noticed besides the poor low speed operation, 
the left side cat was running hot. With this in mind, I'm thinking maybe I 
have a bad coil on that side of the engine.  So I pull the distributor 
caps to take a look to see if their condition yields any clues


Both caps are full of condensation. Grrr.

I clean both out, button everything up, drive the car. Runs like new.

Granted, the MAF was sketchy and the topside hoses were bad, but I can't 
help but wonder if the condensation wasn't part of the problem as well


What's important is that it's fixed. Lesson learned.

Dan
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Re: [MBZ] S500 Mystery Solved

2015-06-14 Thread Jim Cathey via Mercedes

Not solved.  Where did all this moisture come from?  That's
not normal.  Is the crankcase ventilation plugged up such that
a little bit of the blowby was coming 'round the shaft?  Did
you hose down the engine a little too vigorously?  Ford any
streams?  Buy the car in Florida, 'cheap'?

-- Jim


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Re: [MBZ] S500 Mystery Solved

2015-06-14 Thread Mitch Haley via Mercedes
Is that one of the reasons why Poos normally recommends the 1996-1999 cars with 
coils on plugs?


Mitch.

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Re: [MBZ] S500 Mystery Solved

2015-06-14 Thread Dan Penoff via Mercedes
Absolutely. Stupid simple to work on, maintain or repair.

Dan


 On Jun 14, 2015, at 3:34 PM, Mitch Haley via Mercedes mercedes@okiebenz.com 
 wrote:
 
 Is that one of the reasons why Poos normally recommends the 1996-1999 cars 
 with coils on plugs?
 
 Mitch.
 
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Re: [MBZ] S500 Mystery

2015-06-05 Thread Rick Knoble via Mercedes
Dan writes:

see if I can find the plan for a DIY smoke tester - this is something that 
is a big help and could use occasionally.‎
‎
‎
You are working on a Mercedes, correct? 

I thought the smoke detector was used exclusively on Lucas electrical parts. 
Although, it is usually quite obvious where the smoke is leaking on those...
‎
http://www3.telus.net/bc_triumph_registry/smoke.htm

Scroll to the bottom of this one...
http://gtr1000.yuku.com/topic/4957

Rick 
Sent from my BlackBerry Z10

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Re: [MBZ] S500 Mystery

2015-06-05 Thread Rich Thomas via Mercedes
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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Re: [MBZ] S500 Mystery/vacuum leaks

2015-06-05 Thread Curly McLain via Mercedes
My favorite indie uses a water hose to find 
vacuum leaks.  Simple.  You spray water around 
until the engine runs faster.  sealing the leak 
with water makes the mixture richer, so the 
engine runs faster.


I could not believe it.  I did not want to hose 
water around the coil , distributor etc, but it 
works.  He found lots of M116 leaks after I fixed 
the easy ones first with his method.





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 itŠ.

Dan


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Re: [MBZ] S500 Mystery

2015-06-05 Thread Max Dillon via Mercedes
I thought starter fluid was used to find leaks in gasoline car vacuum systems?  
Spray a little in a spot, see if idle speed picks up, spray another spot...
-- 
Max Dillon
Charleston SC
'87 300TD
'95 E300
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