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 > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 01-14-2005, 02:32 PM
Registered User
 
Join Date: Nov 2004
Location: Stockton, California
Posts: 49
##!! tach is doing it to me again.

Okay, so tried the "filter" trick, then did a more permanent solution, by taking the sending unit apart and looking for any cold solder joints or loose connections, found none, but touched up some areas anyways and checked for cracks in the circuit. Determined that it was not making a good connection because the pins were loose, so was able to tighten everything up with some black silicone windshield adheasive... Worked great, problem solved.... for two 1/2 weeks. Now my tach is working when it feels like it....kind of like my son keeping his room clean... then today my tach was jumping all over the place to the sound of a relay? coming from the far right glovebox area.... decided to work for 10 minutes, now it's on break. I give up... anyone have an idea what's going on? Out of curosity how many model years were affected with the tach problems? Mine is the '80 300sd.

Thanks in advance!

Les

__________________
1980 300sd - Ivory, Tobacco Interior 130,000 miles
2003 Expedition

Where a calculator on the ENIAC is equipped with 18,000 vacuum tubes and weighs 30 tons, computers in the future may have only 1,000 vacuum tubes and weigh only 1.5 tons. - Popular Mechanics, 1949
Reply With Quote
  #2  
Old 01-14-2005, 03:42 PM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,438
Mine used to do that, where it would bounce around all crazy, then it died, and has never moved since, not even once...and that was a year ago. I replaced the gauge, and the amplifier, no go. I have no idea. Eventually I'll look into the sensor and other things once its warmer out, as its 12 degrees right now...
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
Reply With Quote
  #3  
Old 01-14-2005, 04:39 PM
bullwinkle's Avatar
manic mechanic
 
Join Date: Jun 2004
Location: cincinnati
Posts: 377
could be a sensor-mine works but reads too low & end of sensor is broken off.
__________________
1982 300DT 190K (Diesel Purge + synthetic oil=smoothness at last!!!)
2004 Ford E-350 6.0 L PSD 227K
2006 Dodge Ram 3500 SRW HO Cummins 4X4 48RE 42K (brute force tow vehicle)
2005 Scion xB wife's rolling pop can
1993 GMC Sierra C3500 6.2 142K
Reply With Quote
  #4  
Old 01-14-2005, 05:02 PM
Registered User
 
Join Date: Dec 2002
Location: RI shore
Posts: 2,937
My guess is it is that RPM sensor. I've fooled with it plenty and have basically given up, which I rarely do. I'm too damn cheap to buy a new RPM sensor for now.
__________________
'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.
Reply With Quote
  #5  
Old 01-14-2005, 05:53 PM
Registered User
 
Join Date: Nov 2004
Location: Stockton, California
Posts: 49
The sensor huh? Is there no end in sight? I guess I shouldn't complain it is a 25 year old car... but dang, all these little things are happening on my shift. Will be added to my growing list of things to do. So where might I find the sensor on my engine?

Thanks again!

Les

__________________
1980 300sd - Ivory, Tobacco Interior 130,000 miles
2003 Expedition

Where a calculator on the ENIAC is equipped with 18,000 vacuum tubes and weighs 30 tons, computers in the future may have only 1,000 vacuum tubes and weigh only 1.5 tons. - Popular Mechanics, 1949
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 02:35 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, 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