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  Filled diesel car with petrol - what damage have I done? 2 Apr 2015 (Ask HJ)
  My father-in-law recently filled his 2010 Mazda 6 diesel with petrol. After driving up the road, the car stopped and wouldn't restart. He was towed into...
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  Will performance fuels fix my car's misfire? 8 Jan 2015 (Ask HJ)
  My BMW 3 Series Touring sometimes misfires and starts jerking (kangaroo style), on a trailing/light throttle about 1500rpm as though its in too high a...
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  Peugeot 205 refuses to tick over 3 Oct 2014 (Ask HJ)
  I own a 1984 Peugeot 205, but it refuses to run for more than 30 seconds. I seemed to have checked everything, even had wiring loom apart, but haven't...
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  Can you recommend a nearly new family hatch? 12 Mar 2014 (Ask HJ)
  My wife has owned a Honda Jazz 1.4 from new for eight years and is looking for a replacement that is quieter, more comfortable and fuel efficient. The...
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  buying a small car with £2000? 4 Jun 2013 (Ask HJ)
  I am selling my Renault Scenic Megane 2.0 as fuel consumption is so high. I will be looking for a used car, either a hatchback or estate, of around 10...
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  Could this 'surging' be from a sticky EGR valve? 31 May 2013 (Ask HJ)
  I bought a Nissan Qashqai five weeks ago from a main dealer and have felt the car surging from time to time. I am told by a friend that it is probably...
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  What is causing our Hyundai ix35 GDI to cut out? 25 May 2013 (Ask HJ)
  We have a 20012 Hyundai ix35 1.6. In the past three days it has cut out three times whilst driving. We are worried about this because of the danger aspect....
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  Ford Focus 1.8 Zetec - Motorway cruising speed 6 Nov 2012 (Ask HJ)
  My Ford Focus 1.8 petrol Zetec 2010 has done 20,000 miles and will take us to the French Alps in December. If we cruise on the French motorways at 85 mph...
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  My E250 won't even meet Real MPG averages 16 Oct 2012 (Ask HJ)
  I have a Mercedes-Benz E250 CDI Blue Efficiency. This car is supposed to give 53.3 - 57.7 mpg and the average ecoconomy shown on your Real MPG section...
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  Is Texaco premium fuel any good? 17 Aug 2012 (Ask HJ)
  I asked some months ago about the advantages of Shell/BP Premium Diesel and I followed your advice and use premium. One of my nearby Shell filling...
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  Diesel vs petrol 15 Apr 2012 (Ask HJ)
  It is generally accepted that diesel engines are more economical in terms of fuel consumption and yet petrol engines seem to be preferred by motoring specialists....
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  Blue smoke at car startup every morning 21 Mar 2012 (Ask HJ)
  I realised my 306 TDI was not accelerating beyond 100km/h. On arrival, the car had some difficulty starting. My mechanic then recommended we replace...
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  Why do so many of your readers fill their cars with the wrong fuel? 2 May 2011 (Ask HJ)
  What is wrong with people who misfuel their cars? Do they not understand there are things you just do not do? I find it difficult to believe that such...
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  My 52-plate Ford Mondeo takes a while to start when cold and misfires - what's wrong? 13 Sep 2010 (Ask HJ)
  I have a Ford Mondeo Ghia TDCI 2-litre diesel. When it's cold it takes a while to start, it starts smoking and I can feel some misfiring. When it's hot...
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  Why does my biodiesel Citroen Xantia stall first thing in the morning? 9 Sep 2010 (Ask HJ)
  I am using a glow plug style vegetable oil pre-heater unit on a Citroen Xantia with a Bosch pump. My fuel mix is 80 per cent new vegetable oil and 20 per...
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  Why am I having trouble refuelling my Vauxhall Vectra? 2 Sep 2010 (Ask HJ)
  I bought a Vauxhall Vectra Exclusive 1.8 2008 in January this year. I haven't used the car much in the past, but now I have started to use it a little...
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  Is the BMW 5 Series 8-gear auto more fuel efficient than the Mercedes-Benz E-Class 7-speed? 8 Jul 2010 (Ask HJ)
  I'm thinking about getting either a BMW 530d or a Mercedes-Benz E350 CDI coupe. I want an automatic, but the BMW has comes with 8-gear automatic and the...
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  Alcoholic anonymous 17 Oct 2009 (Ask HJ)
  Now living in Australia I have acquired a second-hand six-year-old Honda Jazz at auction with 165,000 kilometres on the clock - only an average mileage...
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  Is my car incompatible with bio diesel? 18 Feb 2014 (Ask HJ)
  Since purchasing my Hyundai i30 I have kept its full service history. The car was serviced in October 2013. The car showed no issues - although a fuel...
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  The injector in my Mazda 3 has failed - is this due to using supermarket fuel? 21 Aug 2017 (Ask HJ)
  Whilst driving along, my 2012 Mazda 3 1.6d (39,000 miles) suddenly juddered and went into limp mode. I cautiously negotiated to the hard shoulder with...