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  Ford Mondeo Mk2 - petrol or diesel? 28 Aug 2010 (Ask HJ)
  I'm trying to work out whether to buy a petrol or diesel Ford Mondeo, taking into consideration that the initial price for this car secondhand is the same,...
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  Is a petrol car better than diesel for short journeys? 5 Nov 2025 (Ask HJ)
  Am I right in suggesting that it's better to use a petrol engine rather than a diesel for short journeys on a regular basis for example only doing 20 miles...
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  Is a petrol Toyota Yaris good for motorways or should we switch to a small diesel car? 20 Mar 2023 (Ask HJ)
  My grandson commutes 64 miles each day on mostly motorways. He has a 2016 Toyota Yaris petrol with 44,000 miles on the clock. Would you advise him to change...
• Mazda Mazda 6 (2002 - 2007) - 04 2.0 Smoke on start up 22 Aug 2015 (Forum)
  I have seen this fault mentioned on forums before, but there has been no suggestion as to the cause. Being reasonably familiar with diesel engines this is the sort of smoke you get when there is excess fuel at start up i.e. it is effectively unburnt fuel, and this would be consistent with its smell. The car always starts very quickly so it is not due to diesel building up due to long cranking before starting.
• Ford S-MAX - White smoke from under bonnet. Losing the will! Please help :-) 25 Feb 2023 (Forum)
  It was a perished O ring on the fuel line. Driven car again and white smoke still coming out from under the bonnet. My question is... could this simply be the diesel that had leaked burning off or should I take it somewhere else for investigation?
• VW Sharan 2007 2.0 diesel - Fuel / strong smell in VW Sharan without engine ru 5 Dec 2019 (Forum)
  Hi everyone, hoping someone can help. We have a 2007 VW Sharan 2.0 diesel, bought in April 2019 with 13,000 genuine miles on the clock. It's now on 20k.  For the last week we've noticed a strong smell in the car when the car has been parked overnight or even left for 2 hours with doors closed.
• Honda CR-V III (2007 - ) - Who sells the most economical diesel for my car? 18 Apr 2008 (Forum)
  Is this because I am now through the 1500 miles mark, because I am using Shell rather than Morrisons or Tescos(amongst others) or is there another reason. If it is the Shell fuel, is there any other make that will give me even better fuel mileage?
• Ford Escort (1993 - 2000) - 93 diesel starting problems. 4 Dec 2007 (Forum)
  It would not restart so i tryed to bump it it started but immediately died and still wont restart. It turns over fine but just wont get going. I changed the fuel filter and plenty of fuel came out, but now it doesn't seem to be getting fuel thru it when i press the self prime button. It did do this once before in the same spot lol but managed to get it started about an hour later after just leaving it it did take awhile of cranking tho but started and ran fine since.
• Rover 420 SDI 2 litre turbo diesel fault 31 Jul 2007 (Forum)
  Interestingly, if the engine is turned off for a short period (say 5 mins) after even just a mile or two from cold, it runs perfectly when re-started. The coolant temperature sensor, fuel filter and the glow plugs have been renewed. I only use Shell diesel fuel, never supermarket products. Any ideas? Thank you,
• Air leak in fuel system [Diesel] 3 Mar 2003 (Forum)
  Xantia 1.9 TD 1995 92000m NB. Same Xantia as in Smokey start thread. I'm pretty sure I've got a leak somewhere in the fuel lines, when the engine is cold is runs rough for 5-10 seconds before smoothing out. After that its fine. Filters, oil etc & glow plugs are fine (brand new Beru), theres no major smoking though if you rev it while its having its coughing fit it will puff white smoke but not a great deal.
• Kia C'eed 1.6d 114bhp - Mis fueled my diesel 14 Aug 2018 (Forum)
  After 25 years of driving diesels I have finally done the unmentionable, yes put petrol in my tank without realising I'd done it untill the day after!...
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  Will stop/start cause engine damage? 1 Apr 2014 (Ask HJ)
  Can you tell me if stop/start systems are bad for engine life? I’ve been told they contribute to the early failure of turbos and I can’t imagine that the...
• Astra diesel cold starting 3 Dec 2002 (Forum)
  Once warmed up slightly -no problem. The glow plugs are new so there should be sufficient heat. I have a new air and fuel filter to fit in case there is a blockage in the airflow or moisture in the fuel but would appreciate any advice as to other potential solutions Allan
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  Is my Land Rover Freelander likely to develop DPF and DMF problems? 28 Jan 2012 (Ask HJ)
  I was interested in your warning about impending failures of diesel particulate filters and dual mass flywheels on diesel engined cars. My Freelander 2...
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  Recommend a car that offers good fuel economy on dual carriageways and motorways? 14 Oct 2010 (Ask HJ)
  My weekly commute of 400 miles is responsible for about 90 per cent of my car's mileage. Almost the entire journey is on dual carriageways and motorways,...
• Lexus IS250/220D (2005 - ) - diesel Urban MPG 15 Apr 2006 (Forum)
  Hi I test drove a lexus new IS250 diesel( manual) today The car has 1300 miles on the ODO.. The salesman told me that the car had only been driven in town I noted that the trip computer shows the average mpg as 24 since new and 23 since re fuel.
• Non-ECU Diesels 5 Oct 2001 (Forum)
  Cavalier Replacement? thread, David Woollard made the point: ?It is still a point everyone has to learn that ECU fuel injection in old cheap cars is going to be a major problem in years to come, often they aren't worth fixing.? He went on to suggest a (non-ECU) Xantia diesel. This is a point that is regularly made, for the benefit of those of us that don?
• Fuel (What do you do?) 28 Mar 2008 (Forum)
  But at present I have been using a Shell garage, which is about 3 miles from me as it is always about 2p cheaper for its fuel (diesel) Also every garage I drive by I am now looking at there price for there fuel. (Never bothered before) What do other back roomers do?
• Effects of electical items on your fuel economy 10 Jan 2008 (Forum)
  I was watching an old repeat of Top Gear the other night where Clarkson drove an A8 Diesel from Lonfon-Edinburgh and Back. He was saying that he turned the heating off to save fuel econmy, likewise he was driving on side lights in the rain rather than dipped beam. Now I know that the air con compressor will increase fuel consumption but would you really notice extra fuel being used by using your heater?
• Speedsters galore, fuel must be too cheap 4 Jun 2008 (Forum)
  Don't they care about conserving fuel for the future and reducing air pollution if they reduce their speed ?