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• Diesel waxing 19 Jun 2007 (Forum)
  Do the fuel companies still alter diesel at the refinery, according to season, to avoid the waxing that used to plague HGVs?
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  Are there any advantages to declaring my classic car SORN for the winter in terms of road tax and insurance? 20 Apr 2018 (Ask HJ)
  I've had my 1986 Vauxhall Cavalier Convertible Mk2 for a couple of years now and have enjoyed driving it in good spells of weather. Is there any advantage...
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  Our diesel Ford Focus suffered a big DPF fault with other damage - is the trader who sold us the car liable? 2 Feb 2013 (Ask HJ)
  I am writing you regarding my Ford Focus 1.6TDCI. I purchased it in April 2012 with 38,000 miles on the clock. In October the engine malfunction light...
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  I replaced my diesel Octavia with a petrol Avensis and have saved a lot of money. 16 Jun 2012 (Ask HJ)
  I was interested in your correspondent RY of Peterborough's comments about diesel engines. After 10 years of driving new and nearly new Volkswagen Group...
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  Delivery amounts at the pumps 23 Feb 2011 (Ask HJ)
  This is a question to you and your readers. I have noticed recently that it seems to be impossible to put the desired amount (by price) of diesel into...
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  Can you improve your fuel economy by changing your driving style? 11 Mar 2012 (Ask HJ)
  I suppose it's fair to say that all the EU fuel efficiency tests are carried out in the way described on the car fuel data glossary at www.directgov.co.uk...
• 2003 Ford Mondeo 2.0 Tdci 130 - 2003 Mondeo 2.0 Tdci 130 Trusty Glow Plug Light! 13 Feb 2012 (Forum)
  The first time this light came on, on a long run, and would not go away on restart, I took the car to a Ford garage and they told be the fault code was "Knock threshold reached on number 3 injector", so after the first recode (which cleared the error for about 5000 miles), when the error came up a second time (this time on "number 2 injector"), I bit the bullet and had all four injectors and the fuel pump reconditioned by a very reputable firm, at this time I also replaced the DM flywheel (which was filling my starter motor full of grindings) and the fuel filter. The filter was clear, as was the fuel pump, so my fears of rubbish coming through the fuel line were removed.
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  SEAT Ibiza Ecomotive Fuel consumption - Only achieving 50mpg when should expect more than 80mpg 25 Jan 2011 (Ask HJ)
  Having easily achieved the government mpg figures for various vehicles from new (petrol and diesel small and large), I was confident that I could expect...
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  Uplifting thought 17 Jan 2009 (Ask HJ)
  As a fairly well seasoned motor trader of some seventeen years now I read your Saturday column with eager interest. Two points really, in the main it never...
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  What scooter should I buy? 3 Jan 2019 (Ask HJ)
  I need a scooter for a holiday home in France with low seating and sufficient power to get up some steep hills. I've been told fuel injection is best so...
• Vauxhall Corsa CDTi 05 plate - V Bad fuel consumption + minor electrical niggles 26 Jan 2011 (Forum)
    Surely to god I would notice a leak like that.  I wondered does the ECU do anything with fuel (DH talks about the mix on his old escort when he was younger I know this is fuel v air - won't entertain cars now you can't tinker).  I wonder because I have had a series of minor and inconsistent electric blips.
• Ford Escort - 95 1.4i Acapulco - Electrical problem... 27 Mar 2010 (Forum)
   This is done through the output of R2 (the dubiously named 'power hold relay') - The output of R2 is also used to pull up the fuel pump relay (R3). This would seem to explain my fuel starvation symptoms . While fault/short has been developing it's been pulling current and away from R3 and de-activating the fuel pump. - I currently have a short either in cables or systems mentioned above down circuit of F13.
• Vauxhall Astra F (1991 - 1998) - 96 1.7 Diesel. Wierd fault: fuel stop / cut off so 28 Nov 2009 (Forum)
  My neighbour's 1996/7 Astra 1.7 TD has a strange problem developing (I think!), related to the fuel cut-off solenoid(s?) on the fuel pump. He has had difficult cold starting, (turning over for ages, unevenly, then eventually starting with a cloud of smoke and still uneven for a few seconds), so I checked the glow plug feed / timer, and then replaced the glow plugs.
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  Switching from EV to hybrid or diesel - what should I buy? 5 May 2022 (Ask HJ)
  I have been a Nissan Leaf owner for five years and it's absolutely fantastic for local driving but as soon as I go further afield I can't be sure I will...
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  Should I get diesel, petrol or hybrid for my next car? 13 Sep 2017 (Ask HJ)
  I currently own a 2015 Renault Kadjar 1.5 diesel. We bought the car due to its ability to carry large loads, comfort on long journeys and fuel economy....
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  Fuel Lines 5 Dec 2016 (Ask HJ)
  Where can I get Injector Fuel Lines made for an Audi 100 Quattro 2226cc 1988?
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  Ford Focus 1.0 EcoBoost turbo problem 19 Jul 2015 (Ask HJ)
  My daughter has recently taken delivery of a new Ford Focus 1.0 EcoBoost. The car is on a 3 year Personal contract purchase. She has experienced an intermittent...
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  S Max - Petrol or Diesel? 20 May 2015 (Ask HJ)
  I'm thinking about getting an S Max as a family car but Petrol models appear to be thin on the ground. I'm apprehensive about getting a diesel as most...
• 2003 1.8l Mondeo Estate, 144k miles - Ford Mondeo Mk3 Hesitates and Stutters during acce 23 Apr 2015 (Forum)
  Answer from the other web page below:  It could be the coil pack, they are incredibly sensitive to damage if the engine is turned over with a plug lead disconnected - they generate such a high voltage without a plug to limit it, that the internal insulation breaks down. It could also be a partial blockage in the fuel system, if changing the fuel filter disturbed some crud in the pipes. A tank of Premium unleaded (eg. V-Power) should help that, they contain fuel system cleaners. Or put a dose of fuel system cleaner additive through it..
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  Is there a way of improving the fuel economy of our Jeep Grand Cherokee? 17 Aug 2013 (Ask HJ)
  My wife has just sold her much-loved 1996 Jeep Grand Cherokee and bought a newer one, a 2000 Grand Cherokee 4-litre petrol which has only 38,000 miles....