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#1
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1986 SDL Tach reads fast
The tachometer on my "new to me" 1986 300SDL is reading consistently about 60% fast. It indicates 1100 at idle and 5000 at 75 MPH. It is not jerky or intermittent so I am ruling out a loose connection. Is there an adjustable dashpot (or something similar) somewhere in the system? Where does the tach get its signal from? I looked through the FSM but found nothing.
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Later.........Gregg (86) 300 SDL (00) GMC Yukon XL 4X4 (97) C5 Corvette (02) BMW R1150GS Adventure (00) KAW Nomad 1500 FI |
#2
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Usually the tach problem is assocciated with the sending unit mounted on the drivers side inner fender, in front of the GP relay. It is round, with a plastic retaining strap, this unscrews from the plug. You will note a cable leading to the front of the engine at the flywheel. I am unaware of any adjustment.
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#3
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'85+ do not have a Tach Amplifier.
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#4
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Quote:
Anyone know how the tach is signaled on an 86 or newer?
__________________
Later.........Gregg (86) 300 SDL (00) GMC Yukon XL 4X4 (97) C5 Corvette (02) BMW R1150GS Adventure (00) KAW Nomad 1500 FI |
#5
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Quote:
1985 and newer do not have the Tach Amp. It's the EGR computer down in the passenger kickpanel that controls it as I recall.
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
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