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#31
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The EGR computer is by the right kick panel. I ran the wire under the dash to the cluster. Plenty of room under there. I had a forum member pm me last week for help and he did get his tach working using this DIY.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#32
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Thanks,
I figured it out. That was obvious now that I look back on it.
I had an interesting Day One of the tach addition. I obtained the tach, installed it in the cluster, and did the wiring. The tach is receiving signal (from .2V to 1V AC) depending on RPM, just like it should. However it is not receiving power from the EDIT: dedicated power cable. I soldered the power cable (same as in your diagram) to the same location as you did, but your cluster has things configured a little differently than mine. I suspect that I need to find another power source. Also a problem... front + rear reading lights and clock power (red wire with spade connector) do not have Voltage. Gonna look into it tomorrow...
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1982 240D 4spd, 327,000mi Last edited by dantheman67; 08-01-2010 at 12:53 AM. Reason: Clarification |
#33
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I got it! Blown fuses, combined with the fact that my power wire hack was not delivering power. I fixed the power wire set up (it's now pulling 12V from the clock connector. I know, it's permanent 12v) and the tach works great.
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1982 240D 4spd, 327,000mi |
#34
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Congrats on getting the tach working! Having constant +12 to your tach, see if the tach registers while the starter cranks. That'd be a cool feature to have to check condition of your battery and starter.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#35
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It doesn't. Needle rests at zero while cranking and the first second of engine running, then comes to life. I checked the battery voltage too (for a different reason though)-- putting out little over 14V
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1982 240D 4spd, 327,000mi |
#36
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I can confirm that "EGR tach" works great in 240D. Thanks to OP!
Last edited by whunter; 11-28-2011 at 11:39 PM. |
#37
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I do have an issue though- if I leave the car overnight, the clock will be way off in the morning. Once I set the clock however, it stays matched while driving. I think it's related to the fact that I tapped the clock constant 12V to power the tach, but I'm not sure. Anyone got ideas?
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1982 240D 4spd, 327,000mi |
#38
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Quote:
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#39
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The one sucky thing about having a 1977/1981 car...
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1981 300TD 4 speed manual Euro bumpers, zender valance and skirts, H&R springs, billy HD's, leveled sls, real AMG Pentas 16x8 et11, vdo boost/egt gauges intergrated into ash tray, eurolights, led 3rd brake light |
#40
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Quote:
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked Last edited by funola; 08-13-2010 at 10:09 AM. |
#41
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Why? No EGR computer?
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#42
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Correct neither the body ('81) nor the motor ('77).
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1981 300TD 4 speed manual Euro bumpers, zender valance and skirts, H&R springs, billy HD's, leveled sls, real AMG Pentas 16x8 et11, vdo boost/egt gauges intergrated into ash tray, eurolights, led 3rd brake light |
#43
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You could take all the tach parts from a 300D turbo (mag pickup, tach amp, harness and tach/clock combo) and install it on your 240D. The only thing I'm unsure of is whether there are mounting holes for the mag pickup and whether the tooth trigger exist on the 77 harmonic balancer. If not, the job becomes harder. You have to add the tooth and figure a way to mount the mag pickup.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#44
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Neat!
I just happened to have an old 300D Turbo cluster laying around that has the tach/clock combo. I had kept it for the speedo and fuel/temp/oil gauges. Now I can have a tach in my '82 240D 4-speed! Wooooohoooo!
kevin |
#45
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Nope -- you could attach an RPM sensor to the crank pulley or one of the injector lines (piezo sensor - actually measures the expansion of the pipe when the injector pump "fires" - very cool!)
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