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#1
05-28-2008, 08:09 PM
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1987 300d idles low, new fuel filters
I was having issues with a low idle and hard starting. It idles at 500 and stumbles and shakes. It seems to run ok once I'm on the fuel.
I replaced the fuel filters tonight and cracked the injector lines to bleed, it took a long time to get fuel to the injector lines and it still started hard once I did. So I've gotten it started and it still runs just like it did before I did anything with it. When I purchased the car a year ago it started easy and ran great. could a failed lift pump be causing these issues?
__________________
87 300D Turbo (still wondering about #14 head) 98 Buick Regal GS (one quick grocery gettr) 07 Honda CBR1000RR 04 Dodge Ram Laramie 4x4 CTD (heaven) 95 Dodge Ram 3500 CTD. Need snow plowed? 
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#2
05-28-2008, 10:10 PM
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More likely a bad overvoltage protection relay or OVP relay fuse. Could also be a disconnected or damaged wire to the round red plastic thing at the tail end of the injection pump.
Sixto 87 300D
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#3
05-29-2008, 07:17 AM
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Where is the Overvoltage Protection Relay and is the fuse for it marked in the fuse box?
edit... also how many wires running to the red plastic thing on the back of the IP? I checked a 2 wire thing back there and all seems well with it.
__________________
87 300D Turbo (still wondering about #14 head) 98 Buick Regal GS (one quick grocery gettr) 07 Honda CBR1000RR 04 Dodge Ram Laramie 4x4 CTD (heaven) 95 Dodge Ram 3500 CTD. Need snow plowed?
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#4
05-29-2008, 08:18 AM
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Over-voltage relay is behind the cover that is behind the battery.
DOES the tachometer work? Is the ABS lamp on?
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#5
05-29-2008, 10:30 AM
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Quote:
Sixto 87 300D
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#6
05-29-2008, 11:35 AM
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It could be backwards too... this was the case on my SDL. Or check that rotary knob with the digits for setting idle. I think it's what, No 5 for the 603?
__________________
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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#7
05-29-2008, 11:47 AM
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Quote:
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#9
05-29-2008, 01:18 PM
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Quote:
Tachometer has not worked since I purchased the car... ABS lamp came on when I tried to jump the car because my wife left the key on. What would that indicate? blown OVP fuse?
__________________
87 300D Turbo (still wondering about #14 head) 98 Buick Regal GS (one quick grocery gettr) 07 Honda CBR1000RR 04 Dodge Ram Laramie 4x4 CTD (heaven) 95 Dodge Ram 3500 CTD. Need snow plowed?
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#10
05-29-2008, 02:28 PM
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That could be it!! I know that when my OVP relay went bad on my 86 300sdl, my ABS light came on and my idle speed was way too low. I replaced the fuse and it did not help. I had an extra relay in my stash of parts and popped it in and all was well with the world.
__________________
John 1986 300sdl 1985 380se
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