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V50 struggling to start

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Old Jun 29th, 2018, 18:40   #1
Vanndan
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Default V50 struggling to start

Just recently my V50 has been struggling to start after my first run of the day. Eg. I pop to the shops for some bits and bobs, it starts up perfectly fine. Get to my destination stop the car do my thing and get back in the car and it gives me hell to crank over. It will start eventually. If any one could give me advice or tips I would appreciate it. Thanks in advance. Edit : I've been researching, could it be a temperature sensor as it's only been doing this since we've had this hot weather?

Last edited by Vanndan; Jun 29th, 2018 at 19:02. Reason: Researched the problem
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Old Jun 29th, 2018, 19:14   #2
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what engine type?

I have a 1.8L petrol with the same behaviour and it seems to be more of a common problem with the focus/volvo's with this engine. Not sure what it is but it only happens with a warm engine. Cold starts are fine.
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Old Jun 29th, 2018, 19:23   #3
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It's the 2.0 D SE. From what I have been reading it could well be the temperature sensor. If it's faulty the sensor will think the engine is cold so it chucks more fuel down the line (I think) but in reality the engine is still hot. It gives it a rough start. For the first time today it dumped smoke out the exhaust on the second start. But yeah same here cold starts are fine.
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Old Jun 29th, 2018, 21:07   #4
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I struggle to start most mornings.
I find that a pot of tea with some toast and marmalade usually does the trick.
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Old Jun 29th, 2018, 21:23   #5
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I agree with the tea and toast but it's all about that marmite for me
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Old Jun 30th, 2018, 00:15   #6
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Quote:
Originally Posted by Vanndan View Post
Just recently my V50 has been struggling to start after my first run of the day. Eg. I pop to the shops for some bits and bobs, it starts up perfectly fine. Get to my destination stop the car do my thing and get back in the car and it gives me hell to crank over. It will start eventually. If any one could give me advice or tips I would appreciate it. Thanks in advance. Edit : I've been researching, could it be a temperature sensor as it's only been doing this since we've had this hot weather?
Always had this problem. Never got to the bottom of it. I just don't do short hops anymore. Wastes a bit of fuel and time but saves the grief.
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Old Jun 30th, 2018, 09:45   #7
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The flap in the throttle body is sticking, a common problem with that engine. Somewhere in this forum there’s a how to on cleaning and slightly modifying it. If you can find it, PM me and I’ll tell you how to do it. How olds your V50?
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Old Jun 30th, 2018, 11:40   #8
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In short, the throttle housing on your V50 (depending on age, there’s two different types) is made of plastic with a plastic butterfly flap in it. When the engines cold the flap is a snug fit but over time you get oily coke deposits from the EGR build up around the flap. When the throttle housing expands the flap jams o the deposits in the housing which is why in short journeys you get no issues but if the engine gets up to temperature it gets hard to start, essentially the flap is getting stuck until the engine cools allowing the throttle housing to contract which releases the butterfly flap.
You’ll need some basic tools, light sandpaper, carburettor cleaner, old toothbrush and some Torx’s Keys to strip the housing off the engine. This job will vary depending on the age of the V50, mine was an 06 with a single inlet throttle housing which is easy to remove.



Remove the intake pipe from the end of the throttle housing by undoing the jubilee clip. Push the pipe out of the way. Disconnect the vacuum pipes that go into it and remove the sensors by undoing the torx screws that hold em in, don’t damage them. There’s three torx scores that hold the throttle housing to the manifold, undi them and remove the housing.

Inside the housing you will see a butterfly flap which will be closed. Push it open with your finger and wash it out with the carb cleaner using the tooth brush to loosen up and carbon deposits. Once it’s clean, keep the flap open and carefully chamfer the edges of the flap (don’t panic, it won’t cause any issues), I do it enough so I can shine a torch up it when the flaps shut and see a halo effect around the edges of flap. Once that’s done, refit the flap and see if it cures it.
When my car did it, I bought another housing from Volvo and after about a year or so the new one did the same so I modified it as above and it never gave anymore problems. If your problem persists then you’ll need to get the codes read on Vida, it could then be a sensor or some other issue.

If you’ve got the twin inlet throttle housing I’m not sure about those.

Good luck with it.

TT
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Last edited by The Thong; Jun 30th, 2018 at 11:43.
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Old Jul 1st, 2018, 00:07   #9
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Thank you very much for such a detailed reply. Mines a 55 so most probably the single. It won't do no harm cleaning it all even if it isn't the problem. I did a short trip in it today but kept the car in shade and since I was in a isolated place I propped the bonnet open slightly to what I think helped cool the engine down. I will get to work cleaning it and will post back in here with my results. Cheers
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Old Jul 10th, 2018, 17:49   #10
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So I took the throttle body off and looks like I need a whole new one. As one of the flaps is loose, the teeth on it have smoothed off the plastic. It was a the double as well and it's proving difficult to find one within a decent price range
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