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 ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 08-13-2003, 07:55 PM
Registered User
 
Join Date: Sep 2002
Posts: 12
Tach quit working along with A/C

i have a 1984 190-D, today the tack stoped working and at the same time the A/C compressor stoped also. I checked all the fuses and they are OK. I was wondering what the problem might be? could it be the RPM Sensor on the engine? how do i trouble shoot the problem? this is really weird. The blower is still running so i know the fuse that controls the climate control is ok plus i checked it also.

HELP a HOT MB owner in South Louisiana.!!!!!!
__________________
1984 190D 2.2 (the real one not the 2.0 bored out)
1994 Saturn SL1
1994 Jeep Cherokee 4.0
Reply With Quote
  #2  
Old 08-13-2003, 09:14 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Fix the tach!

The tach signal is processed by the EGR transducer I think. Without a engine speed signal the compressor will shut-off. The OVP relay gets real involved here by powering the EGR transducer.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #3  
Old 08-13-2003, 11:05 PM
Plantman's Avatar
Registered User
 
Join Date: Jan 2003
Location: Miami
Posts: 2,133
SAme thing happened to my 300sd after I changed the starter, Turns out I left a ground wire loose on the battery. Check it out even if you did nothing tp the car.
Reply With Quote
  #4  
Old 08-13-2003, 11:13 PM
Plantman's Avatar
Registered User
 
Join Date: Jan 2003
Location: Miami
Posts: 2,133
SAme thing happened to my 300sd after I changed the starter, Turns out I left a ground wire loose on the battery. Check it out even if you did nothing tp the car.
Reply With Quote
  #5  
Old 08-14-2003, 12:19 AM
Registered User
 
Join Date: Sep 2002
Posts: 12
Steve

Hey steve, thanks for the info but whats an EGR transducer and a OVP relay, this is on a Diesel powered engine.
__________________
1984 190D 2.2 (the real one not the 2.0 bored out)
1994 Saturn SL1
1994 Jeep Cherokee 4.0
Reply With Quote
  #6  
Old 08-14-2003, 09:04 AM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Don't matter diesel, does matter speed sensing.

If you have a Klima relay then you have engine speed sensing. If you have a tach then there is speed signal conversion, usually done by the EGR transducer on diesels (done by ignition controller on gas). I'm not sure how much electronics are on an 84 190D but if it has a klima it wants engine speed.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #7  
Old 08-14-2003, 07:20 PM
Registered User
 
Join Date: Apr 2001
Posts: 167
OVP relay

2 to 1 is my guess.
I am not a gambler but I would wager on this.
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 06:48 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page