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| Mercedes 190D 2.5 Auto; Won't Start | |
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| Tweet Topic Started: Fri Jun 11, 2010 11:24 am (1,419 Views) | |
| dandanfireman | Fri Jun 11, 2010 11:24 am Post #1 |
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Newbie
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Hi there guys. Ok problem is we have this auto 2.5 190D lovely car one day it drove into the driveway, the next day it wouldn't start. Been sat there for nearly 2 years now. The fuel tank has been drained and cleaned, fuel lines changed as there was a lot of crap in the tank that seemed to be coming up into the system. This never got any further than the fuel filter which has been replaced every time it got full of crap. Because its an auto it would have trouble changing gear occassionally, and feel like it was being starved of fuel so it would change back down and everntually stop. You would have to keep turning it over again and again until it fired into life only with the aid of flooring it, smoke would go everywhere but it would go for a few miles again. This problem however was no every day. Some days it would run fine with no stutering or faults which seemed really strange if there was a blockage in the fuel pipes. So i'm here to ask for advice now as i think it could be electrical given the auto box and ecu etc however i have no idea about Mercs and need some help in diagnosing this one (its my Dads) seems a shame to scrap it as its a nice example on a late K plate. Thanks Dan |
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| kentronix | Fri Jun 11, 2010 11:38 am Post #2 |
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I'm only really here for the Kitchens
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Very unlikely to be electrical, you can run a 190 diesel without a battery once you get it started. It sounds very much like fuel starvation to me, most likely towards the back of the car somewhere. Given that you have changed the fuel lines next port of call would be the tank strainer and then the tank vent. I assume you changed both filters ? There is an inline one and a canister one. If the tank strainer doesnt help (I bet you a current bun that it does) I would look for air leaks. Air getting sucked into the fuel lines at a bad joint. Visually inspect and then the best ways are to either replace various rubber hose with clear hose so you can see if there is air at that point..... or bypass certain parts one by one. First to bypass would be the fuel thermostat (common failure point), then the heat exchanger, then run some hose direct from a bottle of diesel into the lift pump (bypassing all the lines to the tank). If you get to the point where you have diesel coming direct from a bottle, into the canister filter and it still wont run then its either the injection pump or the line to it. Temperature has a large effect on diesel. My tank strainer is partially blocked. Although I run on veg the effect is the same. On hot days I can run the tank empty. On average temp days I get to 1/4 full and it conks out because there isnt enough weight of fuel to push it through the partially clogged tank strainer. |
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| Rich27 | Fri Jun 11, 2010 1:35 pm Post #3 |
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Admin
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As you can a petrol. If it wont run with no battery then the alternator is shot, this is a good way to check. Definatly sounds like a fuel problem. If you take the air box off can you see what is going through the inline filter underneath and also the clear fuel lines from the caniseter filter? |
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| kentronix | Fri Jun 11, 2010 1:42 pm Post #4 |
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I'm only really here for the Kitchens
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I meant without power of any sort rich, I havent tried it but I am not sure the diesel needs the alternator to keep running. |
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| Rich27 | Fri Jun 11, 2010 2:22 pm Post #5 |
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Admin
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Really, I didnt know that. But we (me and Andy) did a battery swap, I started his 190e using the battery from mine , no jump leads, removed it with the engine running and replaced it with his flat battery. Where abouts is the tank strainer on a 190 2.5d? underneath near the oulet of the tank I suppose. And is it quite easy to take the tank out of a 190d, I`m sureI read somwhere on here that its quite easy. Edited by Rich27, Fri Jun 11, 2010 2:23 pm.
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| dandanfireman | Fri Jun 11, 2010 2:31 pm Post #6 |
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Newbie
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Hi again guys, the fuel tank and strainer have been removed by a local garage and blasted out and cleaned thoroughly. The lines up to the inline filter are clean and carry no crud now. So this is the situation i am now in all fuel up the there, appears clean and is being sucked up from the inline filter so i am assuming the pump is doing its job there. As it is an auto i'm thinking there are things that the battery is definately required for here. Thanks for your help so far. |
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| shrekky | Fri Jun 11, 2010 2:51 pm Post #7 |
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Troll hunter
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the only things that would stop a 190 diesel from starting are, fuel starvation, air getting into the fuel system,a vacuum line leak, faulty lift pump (especially if the fuel system has been drained) or a fualty distributor pump. the engine cut off on 190's uses a vacuum to operate, i personally would be would be looking at the vacuum lines form cracked/holed pipes and blocked one-way valves..................having said that, once they have been drained they do require alot and i mean alot of cranking to get the air out of the system, i've flattened the battery on a couple of occasions,even burnt a starter motor out once .....................have you tried cranking it over with someone holding the "stop" lever on the fuel pump up ?..........because if there is a vacuum leak the lever wont rise properly and rich, because they use vacuum to stop the engine, you can bump start them and drive without a battery and a alternator
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| RichardCC | Fri Jun 18, 2010 11:50 pm Post #8 |
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Part of things
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Bit late to see this thread, but as regards to the tank fuel strainer it is reasonably easy to renew but a little messy. Access to the bottom of the tank is up above the rear axle hidden by a largish round flat rubber boot and the feed and return fuel pipes run into the tank through it. So drain tank down completely and then you access these two fuel pipes and undo the securing nuts, pray they are not rusted in 'cos then it's a real pain to release them because you are usually lying flat on your back and they are awkward to get at. Once you've released these then you can get a largish deep socket onto the filter edge (which is a nut with a filter on top of it, all one casting). Unscrew it and usually you can wash it in diesel and then put it back, if not I think the stealership charge about £5-7 (last time I bought one). Hope that helps with part of your problems/elimination of and that you get your dad back to running without having the worry of 'conking' out |
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| Richy190E | Sat Jun 19, 2010 10:41 am Post #9 |
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bubble bubble
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Aerosol brake cleaner? I use this to get the stubborn ones going to bleed, saves the starter And bettery. Just a light mist down the intake while someone cranks it over and it should fire, keep it running with puffs of brake cleaner and it should quickly self bleed. Filling the main filter with veg oil or diesel speeds this up. |
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.....................have you tried cranking it over with someone holding the "stop" lever on the fuel pump up ?..........because if there is a vacuum leak the lever wont rise properly
2:03 AM Jul 11