Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 05-24-2006, 12:51 PM
brookspw's Avatar
Registered User
 
Join Date: Dec 2001
Location: Nashville, TN
Posts: 551
Progession of vacuum problems from a faulty repair / c280

I have a 94 c280. It would not start intermittently. They diagnosed a faulty crank sensor and replaced it.

Immediately, I knew something was wrong. 1 -- the transmission shifts were VERY harsh. Ok, I figure, they left off some sort of vacuum line. 2 -- shortly after (couple of days) the internal vacuum control flaps that control the air flow to side and center vents stop working. 3 -- Then, I start losing coolant. I see no drips and it isn't going in the oil (gasket). It has NEVER lost a drop of oil or coolant before this. 4 -- the starting problem is STILL occurring. 5 -- I seemed to note a larger than usual discharge from the A/C condensation drain pipe on some occasions.

Where is the coolant going and could it be related somehow to the vacuum issue? Car is going back in tomorrow for their diagnosis.

__________________
1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
Reply With Quote
  #2  
Old 05-24-2006, 09:50 PM
Registered User
 
Join Date: Oct 2004
Posts: 3,545
The trans shift and climate issues are probably do to a vacuum line(s) off at the lower part of the intake at the back of the engine near the crank sensor There are coolant connections at the rear of the engine, too, but they don't give trouble often. Grab a flashlight and pop your hood open. Leaning over the driver's side fender find your heater hose and follow it down to the engine. Check the hose for leaks and inspect the area under the fitting for leaks too. If everything there looks dry peek down beside the dip-stick to see if the block is wet down there behind the water pump. Water pump leaks are real common on the M104
Reply With Quote
  #3  
Old 05-25-2006, 11:29 AM
brookspw's Avatar
Registered User
 
Join Date: Dec 2001
Location: Nashville, TN
Posts: 551
Quote:
Originally Posted by duxthe1
The trans shift and climate issues are probably do to a vacuum line(s) off at the lower part of the intake at the back of the engine near the crank sensor There are coolant connections at the rear of the engine, too, but they don't give trouble often. Grab a flashlight and pop your hood open. Leaning over the driver's side fender find your heater hose and follow it down to the engine. Check the hose for leaks and inspect the area under the fitting for leaks too. If everything there looks dry peek down beside the dip-stick to see if the block is wet down there behind the water pump. Water pump leaks are real common on the M104
Thank you very much. Any other thoughts out there?

How about my starting issue? If not the crank sensor, then what? Or could the new one be acting up, too?
__________________
1994 C280, dark green metallic
105k miles

1991 190E 2.6, Black
191,500 miles
(sold to another forum member)

2003 Chevy Tahoe LT, Redfire Metallic
105k miles

1989 Mustang GT Cobra Convertible
43k miles
Reply With Quote
  #4  
Old 05-25-2006, 08:43 PM
Registered User
 
Join Date: Oct 2004
Posts: 3,545
Starting issue could be a leaking fuel pressure regulator. Pull the vac hose off it and check for the presence of gas. A faulty overload relay can cause a no start on that model too. I'd start with those two before trying to diagnose the more complex possibilities

Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 07:33 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page