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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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1996/P Volvo V70 10v Mk1 2.5 petrol manual.Views : 1349 Replies : 16Users Viewing This Thread : |
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Jan 7th, 2019, 15:01 | #1 |
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1996/P Volvo V70 10v Mk1 2.5 petrol manual.
Hi chaps,
I have raised this issue before, and since then I have still been unable to track down the cause of an annoying fault with my V70. I found a mechanic with an OBD II reader, but no fault appears to have been recorded - or maybe it was just that he failed to identify the record. The car runs very well indeed, if a little 'rich' in my opinion. On an MoT (which it always passes) it takes literally ages to get the engine/cat hot enough to pass the emissions test (the car only does short journeys and the temperature gauge never rises very much, and I struggle to get hot/warm air into the car. I don't believe there are any head gasket issues. When starting the car it will often turn over, but fail to fire. Sometimes when it does start the engine is running so rough you would think the timing was a mile out, or it was only firing on 3 or 4 cylinders. It then stalls. Turn the key and it generally starts first time and runs smooth as a cashmere codpiece. I don't believe its fuel either, because when this fault occurs there is a strong smell of fuel, obviously resulting from the engine receiving fuel but failing to start. Recently the car broke down - a failed ignition module, which I replaced. For a couple of weeks the car ran without fault, then it started again. This is the second module fitted to the car. My own feeling is that this is an electrical issue, and I also feel it may be damaging the ignition module, which then fails. This is all the more annoying as other than this fault the car runs sweetly. It never fails to start, it just takes a couple of goes. The previous owner has fitted numerous electrical components, sometimes more than once which suggests to me an electrical fault. Any clues please? Many thanks! |
Jan 7th, 2019, 15:43 | #2 |
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Looking at the symptoms and adding my own experience,-
If the car takes ages to show hot on the temp gauge I'd suspect the thermostat is stuck in the open position. My car took ages to warm up when I bought it, it turned out the previous owner had cut out the centre of the thermostat presumably because it had jammed shut. A new thermostat is relatively cheap and easy to fit. My V70 is up to temperature within a few miles even if it's below freezing outside. If the car is having trouble starting a big question is just how is it not starting? If it is not getting warmed up properly on short journeys I might suspect the fabled 'Lawn Mower Syndrome' where a car that runs fine once it's going shows random non starting (after being moved out of the garage to get to the lawnmower). From personal experience with an 850 and a V70 (same engine) I believe it is due to the oil not circulating properly in the hydraulic tappets in the unwarmed engine, which leads to the valves not closing properly, so the next time you try to start it there's next to no compression, if that is the case the engine will turn over more freely than usual but not fire up. In the 850 I had I made a point to drive the long way round just to get the engine warmed through in order to prevent it happening.
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Jan 7th, 2019, 16:33 | #3 |
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Hi Roderick,
I believe that you cannot read codes from a 1996/P Volvo V70 using an OBD code reader. The socket fits but it is not OBD compliant. Maybe someone else can confirm? What is the ignition module that you mention? Those early V70s had one coil, distributor, rotor arms and spark plug wires not five individual coil packs. Can you tell us the Volvo part number of what you have replaced? The temperature gauge should rise to a central position within about five minutes of driving. If it doesn't, then the thermostat is probably stuck open, or is the incorrect one. It is easy to replace. (I would use Volvo or Wahler which is cheaper. I think it should open at 90 degrees Centigrade). Steve
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V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped) Last edited by SteveSarre; Jan 7th, 2019 at 16:35. |
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Jan 7th, 2019, 16:36 | #4 | |
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Jan 7th, 2019, 16:46 | #5 | |
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I do not have the part number for the coil (but I did use a non-Volvo one!) It's the module which is located on the nearside inner wing and looks similar to a motor armature. When I purchased the car it was a non-runner and this was the fault. The car has done probably less than 3000 miles, and the module failed again. I am prepared to accept that this is because I am not using genuine parts...but I'm not sure. I have just ordered a thermostat from Eurocarparts which will open at the correct temperature. I will fit this and let you know what happens! Many thanks! |
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Jan 7th, 2019, 17:57 | #6 |
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Just had similar problems on my V70 1997 petrol: ~ "running too cool" solved by changing the thermostat- the odd start problem can be an issue with the coolant sensor as this will affect fuel mixture readings by the management system. It is advised to also change the sensor with the thermostat & a straight forward inexpensive fix.
You should find further details relating if a search is done. Regards Bob |
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Jan 7th, 2019, 18:10 | #7 |
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Hi Roderick,
OK sounds like you replaced the coil. Like this https://www.partsforvolvosonline.com...4b2f321da0d4d1 I would consider getting a proper Volvo one (but they are expensive when new) Where are you? I think I have a good used one. A good thermostat won't cost much https://www.partsforvolvosonline.com...4b2f321da0d4d1 Make sure you get a new seal with it. When did you last check or change the spark plugs? (Use Volvo original unless you think you know better). How old are the ignition leads? The original leads are made by Bougicord (and the week and year of manufacture is marked on each lead). When did you last check distributor cap and rotor arm? You can scrape the contact points clean if you dont want to buy a new cap yet. Steve
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V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped) Last edited by SteveSarre; Jan 7th, 2019 at 18:16. |
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Jan 7th, 2019, 18:31 | #8 |
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Agree with all the posts above, replacing the thermostat should improve warm up...starting may be the cam position sensor...
and I think you need to make a flash code reader to read codes, although the ODB socket is there (this is where you use the flas code reader) a '96 model probably won't be ODB compliant. How to make a flash code. https://www.volvoforums.org.uk/showthread.php?t=83897 |
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Jan 8th, 2019, 10:40 | #9 | |
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Thanks Bob, advice greatly appreciated. I’ll be doing the thermostat and sensor before the MoT next week. |
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Jan 8th, 2019, 10:41 | #10 | |
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