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88' Doka 'stalling'? no idea what the problem is
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jaber View Drop Down
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    Posted: 28 May 17 at 16:10
Exellent glad you got sorted

Steve👍
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Hi again all,

Just for the sake of closure I thought I would share the ultimate outcome:

As I have said above, I 'gave up' and took it to the mechanic.  He immediately looked at the fuel line hoses.  He changed some hoses and took it for a test drive: same problem!  Then (I am told) on the side of the highway he changed the fuel filter - and voila (as the french say).  The problem is GONE!

After returning, he inspected the hoses that he replaced earlier, and sure enough, the inside of the hoses were cracked and brittle - apparently allowing bits into the fuel line.  His theory is that those bits got into the fuel filter and clogged it.

Make sense? I'm happy with my doka back in working order.

Now, we return to Canada in a month ... anyone in the south of France wanna buy a Doka? Cry
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Points: 13 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Doka_time Quote  Post ReplyReply Direct Link To This Post Posted: 10 May 17 at 15:45
Ok all,  I took it to the mechanic today - mentioned possible water in the tank - so he will probably drain the tank ... (thanks Jaber).

I will try to be a good internet citizen and report here what he comes back with.
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Have you drained the tank, still sound like water to me
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Hi again,

Well, the chemical I put in didn't work - still losing power (I mean horsepower not electrical power) while driving ... at random times (fast, slow, warmed up). 

What I have been doing now is simply shutting it down (turning off with the keys) and coast in neutral for about 20 seconds, then I turn it back on and the problem is gone - horsepower is back ... for a while.  The problem is getting worse - once it starts happening (about 10 minutes after starting to drive) it will occur every 5 minutes or so - ... but then it might go away for a while. so odd.

I have also changed the some of the fuel line clips (the ones I could get to).  Specifically the ones between the fuel filter and pump.

Any ideas?

About to just hand it over to a mechanic ... which should be fun since my french is bad.
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I am sorry to say I am at my last straw.  It is still losing power unexpectedly after adding the diesel additive (to get rid of possible water in the tank).  I changed another fuel line clamp and still losing power.  I think I will just take it to a mechanic - unfortunately my french (I am currently living in France) is not the best, so I am skeptical on how that will go ...

Here are a few more symptoms ... maybe someone can help?

1. I have found that the occurrences of losing horsepower are rare when I have a full tank of diesel. (but they still do occur, but much less frequently)

2. As I am driving, if I feel horsepower loss, I can turn off the engine for about 10 seconds and turn it back on, and power is back.

any ideas?  ... thanks
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OK, just put in some chemical to help with the water problem ... I will see if it still hesitates.  I was going to re-do the clamps on the fuel line, but if I did, I wouldn't be able to know what the problem was (I need closure on this!)

I will keep you updated.
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Drain the tank
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OK.  Just to keep everything updated:  I put the jubilee clip on the filler neck, and the problem went away ... for a while.  now it is back.  Here are my working hypotheses:

1) water got into the diesel from the above mentioned filler neck issue - and while I may have solved the problem of how it got in, there is still water in the tank getting into the engine from time to time - causing the loss of power.

2) air is getting into the fuel line and causing the loss of power.  This is why I am working on replacing the clips as per GavB95's suggestion above.  Unfortunately, I think I bought them too big, and will have to find smaller ones.  

Do either of these ideas sound right to you?

I will mention that when there is a problem (significant loss of power) if I turn the Doka off and wait a minute or two, and then start up again, that the problem goes away (for a while).  Hope that helps.

Again, thanks all for your help.
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Dont think there ever was a clip on the lower one its got a kinda rubber bush fitting iirc usually cracked/perished so wouldnt be a bad thing replacing - brickwerks sell em
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Thanks - on it.  ... just to be completely clear here is a picture showing where I am going to use the jubilee clips (red lines)



Edited by Doka_time - 18 Apr 17 at 08:37
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Yep missing jubilee clip on the fuel return pipe👁
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Missing the jubilee clip - water can get thrown up there! Any splits?
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ok, about to remove fuel filter to look for water, in the meantime here is a pic of the filler neck.



Edited by Doka_time - 18 Apr 17 at 08:35
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No drain but there is a small swirl chamber at the bottom check the filter for water
Steve
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Hi All,

Again, thank you so much for all the advice.

I am both going to check for water in the tank and fix the fuel line clips.  I will keep you updated.  A couple of quick questions:

1) is there a drain on the tank on the bottom where the water would collect?

2) if there was water in the diesel (or if air is getting into the fuel line) is there any explanation for why the doka shows these symptoms on some drives and not others?  it is very sporadic ...

Thanks!
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Points: 192 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jaber Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 17 at 19:17
Mine to ran fine and was rain related although it was a new tank turned out it was the overflow from filler neck around the rubber pipe top the clip was tight but the pipe over the years had become hard, forming a perfect funnel shape, so the water coming off the front wheel went directly down the filler neck into the tank, if you can turn the pipe or move it then you have a problem, drain some diesel directly from your outlet into a clear jug and look for water droplets, yes you will have to bleed the air out but you may have crossed something off your list.

Steve
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It sounds like air getting into the fuel lines to me, I had similar on my van and it gradually got worse until the pump became completely air locked. 

If it is air you'll be getting small bubbles drawing up the line between the fuel filter and the pump, when they're only small they'll pass through without you noticing. As the air builds up you'll get a bigger bubble that causes the symptoms you describe - ie loss of power under load that seems to clear itself whilst you have pressure on the pedal. 

Check the fuel line for bubbles whilst idling and also whilst someone applies pressure to the pedal. 

Edit - I've just seen your pics, you really could do with a clear line on the feed to the pump to check for air, but the worm drive clips you have on the hose unions are no good for small diameters, they oval and don't keep pressure evenly applied on the hose. You could do with replacing them all with this type of clip:



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Take the ignition cluster plug off and drive with it hot wired to bypass switch?
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Hi All,

Thanks for helping out - here are my replies (all in one)

booted: The vehicle is starting just fine ... and upon inspection I don't see any issues with any of the hoses or injectors - see the pics above - the guy I bought it off replaced all of these.

jaber: re: water in the diesel. I was considering that, but I wondered why I could drive it for a long time and suddenly it would start happening.  Also, if it is happening, I can pull over, shut it down for a short time, and when I get back on the road it is gone (for a while).  Although, I notice that it might be associated with the rain.  Let's say it is water in the fuel ... is there an additive for diesel ... how might I diagnose that problem to be sure that was it? 

rowlesy: I did the 'wiggle keys' test you suggested ... I don't know if the test was definitive.   I have attached the image below to help:


I started the diesel engine, and wiggled the keys (in position 2).  When I wiggle them enough so that the key turns a small amount (like 10 degrees) towards position 1 the engine stops.  When the real thing happens, it starts by the vehicle losing horsepower (not to be confused with electrical power), and sometimes jerking/stalling. I was doing the test with the vehicle idling and stopped.

Is there anyway I can diagnose the problem when it happens?  Maybe attach a wire to the solenoid so I can monitor the voltage to it while I am driving?  I will certainly be checking if the keys are not in the right position - we do have a bunch of keys on the key ring ..... hummmm.  will get back to you.  I will try the wiggle test while cruzing down the highway next time. ... safely.

Thanks again to all!  keep the ideas coming!
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