![]() |
|
|
|
#1
|
|||
|
|||
Tachometer nonfunctional on an 85 300D
My tach simply doesnt work. I have searched around and haven't found much information on fixing this. If we can get a list of things to check for any ways to troubleshoot perhaps we can make an informative tachometer troubleshooting thread as well as helping me get mine working!
|
#2
|
||||
|
||||
Is your car a CA model?
__________________
DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 ![]() |
#3
|
||||
|
||||
in 85 ca and fed were identical... so it does not matter.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!! ![]() 1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#4
|
||||
|
||||
Here are a few threads to read:
This one has a lot of information on both CA and Fed cars: 1985 300D CA Emissions Tachometer repair This is a thread on my troubleshooting my 1984 tach problems: Figured out why my Tach won't work...
__________________
1984 300TD |
#5
|
||||
|
||||
They are far from identical. The CA has a trap oxidizer and different emissions components including an emissions computer. I used to own one and even have a specific supplement shop manual for the car.
__________________
DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 ![]() |
#6
|
|||
|
|||
Two things to check......
OVP (overvoltage protection relay), right knee bolster panel under glove box, known to fail after many years. Easy to replace, always keep a spare in glove box. Tach pickup on bell housing above flexplate. It's magnetic, clean it up. Alan
__________________
DO IT RIGHT THE FIRST TIME, DON'T BE A HACK Political Correctness is NOT part of my vocabulary and finally FIGHT CRIME...SHOOT BACK '82 240D Stick '85 300D Auto Drove my first MB at age 16 1960 300SL W190 |
#7
|
||||
|
||||
Little known fuse hidden behind glove box could be blown.
__________________
DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 ![]() |
#8
|
||||
|
||||
Quote:
![]() My '85 tach has sat on 0 since I've owned the car. I've replaced the EGR computer, tach pickup, OVP relay. I doubt it's the gauge but I will swap that sometime when I'm around somebody with one. Good luck with all that......
__________________
Jimmy L. '05 Acura TL 6MT ![]() 2001 ML430 My Spare Gone: '95 E300 188K "Batmobile" Texas Unfriendly Black '85 300TD 235K "The Wagon" Texas Friendly White '80 240D 154K "China" ![]() '81 300TD 240K "Smash" '80 240D 230K "The Squash" '81 240D 293K"Scar" Rear ended harder than Elton John |
#9
|
|||
|
|||
can someone post a pic of the overvoltage protection relay on a w123 and its exact location please.
|
#10
|
|||
|
|||
Did you see this thread ?
1985 300 D Tach Problem |
![]() |
Bookmarks |
|
|