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Question for you diseil gurus...

Discussion in '1982-Present GM Diesel' started by muddin4fun, Mar 31, 2001.

  1. muddin4fun

    muddin4fun 3/4 ton status

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    It's not a GM diseil (so shoot me) it's a Mercedes diseil. A '77 4-banger, no turbo (a whopping 67hp). It's prolly got close to 300,000 or 400,000 miles on it. Dad drove it off the showroom floor and I inherited it. I hold a high respect for diseils because of this car. It's never had a real problem until now. Well, anyway, I went out to the car one day and let the glow plugs cycle twice (it was cold out) and tried to start it. Wouldn't start. Let the glow plugs cycle again-still wouldn't start. It's sounded like one, maybe two cylinders were firing. Eventually, the glow plugs really weren't cycling anymore. Then, the glowplug light wouldn't come on anymore. So, I popped the hood. There was a fuseable link broken. I looked at the block heaters and they looked like they were cold. I tapped on the block heaters and realized they were cold. Grrr. I figured that the glow plugs weren't getting hot. Well, I replaced the glow plugs cause after testing the old ones,they needed to be replaced. And, I replaced the link. I checked and the block heaters were getting hot, so (after replacing the battery) I tried it again. No go. I replaced the starter thinking that maybe it didn't have enough to turn it over. Still no go. I checked the compression and it was fine. I bought a block heater that goes on the oil pan and left it overnight and in the morning, still no go. I pulled the injectors and had someone turn it over and every one of them are working fine. The only thing I can figure is maybe I got some water in the fuel and it turned to gel and spun a gear on the injector pump cause the night before when it was running, we got a big cold front and the tank wasn't full and maybe I got some condensation in there. Maybe ya'll can shed some light on this for me?

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  2. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    I think your car is mad because you keep calling it a "diseil"- Mine prefers just good old "diesel" LOL!!!!!!

    But seriously, do you know if you have a 12volt or 6volt glow system? If the system is governed by a regulator, it may be shot and not sending enough juice to glow plugs. It also may be sending too much power and frying the glow plugs. I don't think this is your problem but I'm just throwing things out so bear with me........

    If all your glow/block heater/starter/injector problems have been ruled out, you may have a fuel delivery problem. You didn't mention checking your filters...........When you checked your injectors did you actually get diesel flowing from them? I would change your filters out just in case..............and make sure your fuel pump is delivering the pressure the injector pump needs.

    Sorry, I probably didn't help too much. Keep us posted on what you find.....



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  3. muddin4fun

    muddin4fun 3/4 ton status

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    Sorry about the spelling...I thought that Hooked on Phonics was a rip off!!! Ha ha!!! Ya, I got fuel through the injectors, but you're right, I should change the filters just to rule out that. That car has been so good, it's always something stupid like that. I'll try that and see if that does it. Anymore suggestions?

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  4. muddin4fun

    muddin4fun 3/4 ton status

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    I remember now...I have replaced the filters...

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  5. DieselDan

    DieselDan 1/2 ton status

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    The good part about diesels is they're fairly easy to troubleshoot. Is it puffing smoke when you crank it? If it is then you know you're getting fuel, check glowplugs, crank speed, air cleaner/exhaust. If no smoke then no fuel, check (recheck) if you're getting fuel to the filter, to the pump, to the injectors. It sounds like you've been pretty thorough, might time recheck for something you thought was ok (it happens). MB use gear driven injection pumps don't they? Not very likely it jump out of time then. You mentioned a couple of cylinders sounded like they wanted to fire - my guess those glow plugs still aren't working right.
     
  6. muddin4fun

    muddin4fun 3/4 ton status

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    It's puffing smoke out the back. I put new glow plugs in it. I tested them before I put them in. I also checked to make sure current is going to the glowplugs and it checked out fine. Do you know of a better way to check the glowplugs? I must be missing something. I can't figure it out.

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  7. muddin4fun

    muddin4fun 3/4 ton status

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    Please, someone help! I really don't want to take it to a mechanic. Anymore ideas? Please...

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  8. DieselDan

    DieselDan 1/2 ton status

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    How long are your plugs cycling for? Are you sure you got the correct glowplugs? (VW/volvo takes a plug that's the same size as what's on a GM, but I don't know what model VW/Volvo uses). Last stop - pull a glow plug and let it cycle (ONCE) outside the cylinder head; does it turn cherry red? Plugs should have a resistance (13G are 1.7 Ohms), infinate is blown, less that rated resistance = no heat (maybe?).
     

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