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#1
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My friends 1980 300D does not fire up.
170K miles. Gas tank cleaned and new tank filter 5 years ago. Battery good. New starter. Glow plugs were pulled out and confirmed to get hot although the glow plug light on the dashboard stays on indefinitely even after the click sound is heard from the driver's side fender area. as per past posts, the filters were cahnged and confirmed to get gas flow from pump with pre-filter off. So it cranks over fine but that is it. Will try Benzmac's tip to run comressed air back into tank with gas cap off but until then does anybody have any ideas? Also will have valve gaps adjusted in case that might help. What's up DOC ? Thanks. ------------------ 1979 300D 133K miles 1989 300SE 1995 C280 |
#2
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One thing for sure, your glow plugs have problem. Fix it before you move on to other problems if any. You cannot test the glow plugs by touching them.
David |
#3
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I totally agree with be549. Check the glow plugs with a voltmeter.
Good luck, ------------------ Larry Bible '84 Euro 240D, 516K miles '88 300E 5 Speed '81 300D Daughter's Car Over 800,000 miles in Mercedes automobiles |
#4
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Hee hee. "You cannot test the glow plugs by touching them" - that's a fact. If you can touch them, they're bad. If they are working properly, if you touch them while they're hot you'll lose some skin from your finger.
- Nathan '83 240D, 250k miles |
#5
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UNKL300D,
one thing that poped into my mind is the vacum system. Is the shutoff switch on the pump getting vacum? Is it activating the pump? Just my 2c worth. Mark. |
#6
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Two things. The glow plugs will pull 20Amps a piece. The rack on the fuel pump can be stuck. The side cover on the fuel injection pump can have no dents in it or be overtightned.
------------------ Benzmac: Donnie Drummonds 1992 500E (very soon I hope 1981 280GE SWB ASE CERTIFIED MASTER AUTO TECHNICIAN SERVICE MANAGER FOR 14 BAY FACILITY MERCEDES SPECIALIST 8 YRS PARTNER IN MERCEDESSHOP.COM |
#7
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Try pumping the hand pump vigorously. My 300SD wouldn't start after I changed the fuel filters and pumping the hand pump got it going. Never had trouble again.
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#8
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Did the engine fail to start after the filters were changed or was that one of the things that was done because it wouldn't start? If it was running before the filter change but won't start afterward, I have had a similar experience and think I may be able to help you. Until I know, however, it may not be worthwhile to go through it now.
If you are still having trouble, let me know. ------------------ Ted 1979 240D |
#9
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You have to check glow plug system.
Also, try loosening one high pressure line at any one injector, check for fuel output while cranking the engine. At the very least, you'll know if you have an electrical, or a fuel system problem. ------------------ Jake |
#10
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Thanks for the replies. We got a kick out of the finger test chide ! Actually
mosquitoes were used as test subjects Hee hee. The fuel filter replacement came after the fact but did not help. Further tests will be done to determine if it is a fuel or electric (glow plug) problem. p.s. this same friend of mine recently had the engine rebuilt to his low milage '94 S350D. $$$ugh. lemon city. ------------------ 1979 300D 133K miles 1989 300SE 1995 C280 |
#11
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I also had the same problem with my 1981 200D and they found out my heater relay was defective. I replaced the part and every morning it takes about 3secs to fire up!
1983 300SD 1981 200D 1977 240D 1977 300D 1962 190c |
#12
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Although the fuel pump did pump fuel, it was replaced anyway and the car started
up and runs better than ever ! ------------------ 1979 300D 133K miles 1989 300SE 1995 C280 |
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