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  How can I stop my Honda Civic hesitating under acceleration? 16 Jul 2010 (Ask HJ)
  I have recently bought a 2007 Honda Civic 1.8i ES, and have owned it for a week. I commute 40 miles a day to my workplace and, in an effort to keep fuel...
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  Can I try a premium fuel to improve my Vauxhall Astra's fuel economy? 7 Jul 2010 (Ask HJ)
  I drive a 2006 Astra 1.8 SRI with 49,000 miles on the clock. A few months ago, the onboard computer indicated a 15-20 per cent drop in economy. I checked...
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  Not getting through 20 Jun 2009 (Ask HJ)
  I have followed your suggestions on using Shell V Power fuel, high revs, and petrol cleaners (3 times). However I am still having problems as the engine...
• Vauxhall Zafira A (1999 - 2005) - 99 1.6 Fuel starvation? 11 Jun 2011 (Forum)
  Can anyone help with a problem I'm having with my 99(V) 1.6 Zafira? What has happened on a few occasions is the engine suddenly lost power after a long journey involving over 1 1/2 hours of motorway/dual carriageway driving. I believe it is caused by fuel starvation as there are no warning lights or signs of overheating.
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  My Audi A4 is suffering a DPF fault - what is causing it? 2 Apr 2012 (Ask HJ)
  I drive a three-year-old Audi A4 TDI and cover 85 miles each day to and from my place of work. My total annual mileage is roughly 28,000. On 5 November...
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  Poor fuel economy in a Mazda 6? 10 Dec 2015 (Ask HJ)
  Three weeks ago I bought a Mazda 6 2013 sport nav estate. It's a 2.2 175PS diesel auto. Overall I am very happy with the car. However I am a bit concerned...
• New Ford Fiesta 1000 Ecoboost - Gear lever vibration at around 2500revs 25 Oct 2015 (Forum)
  Honest John advises that there are minor diferences between Ecoboost 100 and 125 with the 125 having an overboost and suggests using the high grade Shell V-Power Nitro Plus petrol so I will give that a go to see if there is an improvement. Anyone else noticing this characteristic?
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  Why does my ford Mondeo misfire? 26 Jan 2015 (Ask HJ)
  My 2001 Ford Mondeo 2.0 petrol has developed a misfire at around 1500 - 2000rpm. Any idea what the problem might be?
• Subaru Legacy and Outback Petrol (2004 - 2009) - Lumpy running on regular unleaded 16 Nov 2009 (Forum)
  The user manual for Subaru Legacy 2.0 says that the car should run fine on regular unleaded (95) and it is only the turbos that need the premium fuel (98 or above). However I am finding that the performance of my non-turbo 2.0 r is brilliant with say Shell v-power but horribly lumpy with regular unleaded. Obviously I am paying throgh the nose for the premium fuel and would rather not if I could avoid it. I'm doing a lot of out-of-town driving and the on borad comp tells me I am averaging 30.3 mpg even on the premium which sounds a little on the low side to me.
• 6 'Fan' belts shredded!! 1997 VW Polo 23 Nov 2005 (Forum)
  Thanks to all of you. My problem is a 1997 VW Polo 1.9 L Diesel. It's shredded 6 'fan' (alternator, coolant pump & power steering) belts in 4 months, with only 2000 miles done. The ribbed V belts look like they've been scored into between the 4th & 5th rib. Three garages can't see any rubbing & are at a loss. £600 has not remedied the problem.
• peugeot 406 bsi faulty? 14 Nov 2005 (Forum)
  Hi, I have a 1.8LX 1999 v reg 406 petrol engine. I was fitting a new radio last weekend, with the radio turned on - As I slid the radio in, the power went off. I have lost my switched 12v to my radio, dashboard rev counter, petrol gauge and oil gauge and LCD displays - also the car wont start!
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  Standard vs premium petrol - which is best? 8 Feb 2016 (Ask HJ)
  I have followed your site for some time and have many a time heard the advantages of Premium diesel (or even branded diesel) over supermarket diesel. I...
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  Benefit of premium petrol? 8 Sep 2015 (Ask HJ)
  I have often seen your endorsement of 97 Octane fuel as worth the extra cost. I have owned from new my loved 2002 Honda Legend. Recently I had the chance...
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  Six months of apparent DPF problems with an Astra 3 Sep 2013 (Ask HJ)
  I have a 2012 Vauxhall Astra 1.7 diesel. It started to cut out in March 2013 and became unreliable. Vauxhall assistance (AA) said it was supermarket fuel....
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  What is causing this fault with our Volkswagen Golf Twincharger? 10 Aug 2013 (Ask HJ)
  I have a 2007 Volkswagen Golf GT Sport Twincharger 140 with 54,000 miles and full VW service history. Whilst travelling at 20mph for 4-5 miles on minor...
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  Can I run my 1991 Scirocco on super unleaded and fuel additives? 12 Jan 2013 (Ask HJ)
  I have a 1991 Volkswagen Scirocco GTll. At present I am filling my tank with Sainsbury's Super Unleaded and adding a Millers VSPe Power Plus fuel additive....
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  What vehicle can cope with towing and long distance travelling? 7 Feb 2024 (Ask HJ)
  We’re farmers and need to tow up to 2.5tons (trailer plus up to several cattle). The farm has a 4.0-litre diesel 2007 Range Rover Sport which has a number...
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  Win diesel 7 Mar 2009 (Ask HJ)
  You state that in lower temperatures diesels use more fuel. What is the thermodynamic basis for this statement? I find it difficult to figure out why...
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  Ford Mondeo refuses to turn over 6 Nov 2016 (Ask HJ)
  I have a 2000 Ford Mondeo petrol that has no spark, no crank and no petrol pump pulse. I've done a diagnostic test, but the computer box is also not receiving...
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  Rover 75 making a rattling noise 27 May 2014 (Ask HJ)
  I recently bought a 2002 Rover 75 diesel auto. After filling the car I noticed a ratting noise and the power steering stopped working. The alternator light...