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Hello guys my name is Ryan im from sunny South wales, I bought my 2004 w168 a140 about October. I bought her from a lady that didn't believe in maintenence! After having it i straight away changed the oil, oil filter, air filter which was black and changed the water and coolant. Got it really tidy and been happy with it so far haven't any problems. Then all of a sudden it had a bit of a funny at the traffic lights. Like died and come back to life. Then the next day no problems at all. The day after i left my house got a mile away from my house and the car died. Just stopped whilst driving. I tried starting it was turning over but there was no attempt at firing.
Managed to tow it back plugged it into a computer and had an error code called p0320 which was ignition distributor engine speed and input circuit. And the code p0600 which is serial communication link. I searched the Internet to try and diagnose the problem. I ended up changing the crank and cam sensors. The car ran but ran like a dog then just would cut off and not start again. The codes had gone but I had a new one which was p0304 which was cylinder 4 misfire. I changed the spark plugs but the actual coil pack itself was glued at the connector to the lead. After changing the plugs the misfire went off the computer but the car still just stops then won't start. My next plan was trying to buy a replacement coil pack and new connector which ill have to cut and join. Really stuck now as I've got a driving lesson in just over a month and no way of practising.
Any ideas so I'm not just chasing my tail id really like to learn and fix it myself rather than taking it to a garage just looking for some advice.
BTW cars done 99k miles

Thanks

Ryan
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I would disassemble all body earth points in the engine bay, clean them, and reassemble again.
Could be a poor earth connection somewhere.
 

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Thankyou for the the reply, there is two that I can see one either side of the engine bay! Any chance that can make that much of a difference? I did think about cleaning them as the one looks dirtier than the other. I shall give that a try tomorrow and keep you updated!

Thanks again!
 

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Right cleaned the three earths in the engine bay that I could find and no joy! Still debatable starting. Started turned it off could hear the starter turning the engine! Give it a wiggle and it started so I'm gunna go the route now of replacing the lead that goes to the spark plug coil pack by cutting and soldering and replacing the coil pack I think! See what happens
 

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Are you saying the starter motor keeps running after your release the key and the engine has started?
 

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Sorry no when I turn the key the starter is spinning the engine but there's no attempt at firing. Then the car will start and just cut out randomly then when I try and turn it over again its just the starter cranking no attempt at firing
 

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Moving this to the W168/169 forum, there may be other owners in that section that have experienced this.
 

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Well @Broonmeister you seem to be getting on quite will without our help 😂 Well done.

Just adding to what @veeeight has said I would also clean the battery terminals but from what you have described I don't think this is a battery/earth issue.

You say that the plug to the coil pack is glued in which suggests that there has been some form of issue there in the past so removing this from the equation seems like a good idea, but you may not be able to buy a replacement lead if it is part of the wiring loom but you might me able to buy a new plug and connect that to the loom instead. Before you do that though is there any possibility you could prise the plug off the coil pack, if you can you might be able to clean the contacts with some contact cleaner/wet and dry, if doing that cleared the problem for a short time it would at least indicate that is where the problem is.

Another option is to speak to a couple of Mercedes Independent specialists and ask them if there is a common problem on these cars that can cause these symptoms. avantgarde-automotive.co.uk in Clevedon are very knowledgeable as are BG Griffiths, Mercedes Benz Specialist, Bristol in Bristol, you could also ask about the coil pack being glued in case there is a common issue in this area.

Any how best of luck
 

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Can I just check what you have said? Are you saying that the problem now is that the car starts from cold, runs without misfire and then dies and will not restart? If not can you please describe the problem as it is now.. Thanks
 

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Yes exactly that mate! Runs without misfire but dies after maybe 10 minutes then won't start again. I've cleaned the battery terminals mate. I'm gunna try and take the connector off today try and get a photo of it. They've snapped the clip they have! Thats why its been glued back into place! Will keep you updated on that. Going to order a new coil pack though as someone has removed the cover for it and not replaced it. And I didn't realise that until these problems arose.
Being out in the snow was also when it was working tidy so maybe some moisture has gotten into my coil pack without the cover on?

Thankyou for the reply!
 

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Runs without misfire but dies after maybe 10 minutes then won't start again.
This sort of problem can sometimes be down to fuelling problems, fuel filter perhaps?

If the fuel line is easy to get at you could try unclipping it when it wont start and see whether fuel is being pumped when the ignition is on. Take all precautions of course and two people will make it easer!
 

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Discussion Starter #12
I'm off to a scrappys in fishponds now, hopefully i can get the coil pack and a cover and the connector off the loom. If I swap it and it works ill know I'll need to buy a new coil and I'm also going to pick a fuel filter up later to eliminate another problem. Even if it isn't these are all things that need renewing anyway. I shall keep you updated like I said when I get back im gunna try get the connector apart and also as you said check for fuel then ill get it up on the ramps and see if I can swap the filter. I know its nothing major just a gremlin somewhere! Thanks for the reply!
 

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Discussion Starter #13
Haven't managed to get the ignition coil so I will leave the glued on connector as is. I'm gunna swap the fuel filter and try from there, just eliminating another problem. It does sound like it could be fuel.
 

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I'm off to a scrappys in fishponds now, hopefully i can get the coil pack and a cover and the connector off the loom. If I swap it and it works ill know I'll need to buy a new coil and I'm also going to pick a fuel filter up later to eliminate another problem. Even if it isn't these are all things that need renewing anyway. I shall keep you updated like I said when I get back im gunna try get the connector apart and also as you said check for fuel then ill get it up on the ramps and see if I can swap the filter. I know its nothing major just a gremlin somewhere! Thanks for the reply!
🤣 I don't think you need our help at all, you have it all in hand 👏

Off to the scrappy's, that brings back some very great memories, but a very long time ago :oops:
 

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I'm not sure about that! Had a little problem! Took the first cover off and found a load of... oil i think? Its like lime green? I don't think its oil but I really can't tell because of the colour! It seems to be around the belts on the left hand side of the engine! I know I did an oil change when I had it and I've topped it up since then but not alot. And I haven't spilled any anywhere. Any ideas? I still haven't got to the fuel filter im terrified of small spaces and its so low to the ground. Sorry about the photos they're straight off my phone! Absolutely devastated now not sure what to do :( couldn't see none of it when I bought it as it had the undertrays on
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If that's the undertray and you don't have to take it off to do an oil change I shouldn't be too worried, I think it might just be a small accumulation of oil that has dripped over a long time that has been added to by water from rain etc. The oil & water mix but the water then can't evaporate so it just builds up.

Whatever it is it looks old so I don't think you have a big oil leak.
 

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Sorry for the non reply! Changed the fuel filter which was an absolute nightmare! Only had standard car ramps even then its very tight underneath. The car seems to run fine now going to give it another test today. Loads of black muck came out of the old filter. But it seems to start easier and run abit better. Maybe it was lacking fuel hence the no starts and misfiring maybe?
I think my water pumps gone too. The residue is all over my serpentine belt and I can't see any fluid from looking in the bonnet only from underneath with the trays off so I'm assuming then seal on it has gone. I've been looking on the Internet and it can be changed without dropping the engine just looks like a real nightmare. So I've started buying tools like flexi head and long reach spanners for when I feel upto the challenge.
I love the car but didn't realise how hard they are to work on, enjoying learning about it though just wish I had hydraulic lift ramps and a whole garage at my disposal!
 

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I think my water pumps gone too. The residue is all over my serpentine belt and I can't see any fluid from looking in the bonnet only from underneath with the trays off so I'm assuming then seal on it has gone.
I shouldn't jump to that conclusion too quickly.

If you have a water leak, if it is a big leak you will probably see steam coming from the engine somewhere or smell the water/antifreeze when the engine is hot. If its a small leak the water level in the reservoir will drop over time so just check it regularly when the engine is completely cold.

Well done getting the fuel filter changed, it sounds as if it needed changing and you have eliminated one component.
 

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How are you getting on with this? Have you sorted everything?
 
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