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• 
  Can you help with running problems in my Ford Puma? 19 Aug 2010 (Ask HJ)
  I'm after information regarding my 1.7 VCT Ford Puma. I have had bad running issues for some time now. Basically, when I start the car from cold the engine...
• Waves, string instability theory and traffic jams 10 Jun 2010 (Forum)
  The research, supported by the Engineering and Physical Sciences Research Council (EPSRC), will lead to better traffic flow forecasting to help prevent congestion. Dr Wilson has looked at existing traffic models in a new way using ‘string instability’ theory to test how good these computer-based methods are at predicting how traffic flows and queues build up and dissipate.
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  Dodgems 5 Jun 2010 (Ask HJ)
  Please can you explain to me where I am going wrong? Yesterday, whilst driving around a roundabout, a car came from my off side, (I was travelling around...
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  Timings, they are a chaining 24 Apr 2010 (Ask HJ)
  I’m having a problem with Vauxhall and just wondered if you could give me your thoughts. I have a Vauxhall Zafira 2.2 SRI, registered 22.02.07 that has...
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  Kyotoo ratings 20 Mar 2010 (Ask HJ)
  Further to the information that you gave to the Mazda owner last week, I would like to add the following in your defence. The owner did not state what...
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  Shouldering, the blame 20 Mar 2010 (Ask HJ)
  I am sending a photo of one of the front tyres from my Getz. The front ones both had the same wear pattern. I blame this wear wholly on our local speed...
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  Clio lame 16 May 2009 (Ask HJ)
  I found a nail in a tyre that is fitted to our 2005/55 low mileage Renault Clio. On taking it to the local tyre depot the fitter on examining the tyre...
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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...
• I am a recovery service, I am 12 Feb 2008 (Forum)
  I press the newly-exhausted AX into service for a jump start. It takes only a minute to realise that the jump leads that have been sitting in the AX boot for over a year are useless, dangerous even. The plastic insulation of one clip bubbles, melts on to the battery and then smokes vigorously. I return home for the jump leads from my car.
• Every parking fine in country invalid? 7 Jul 2006 (Forum)
  That is to say, no fine such as the fixed penalty charge used by local authorities, police forces and various government departments from the Companies House to HM Revenue & Customs, can be lawfully issued and these bodies need to secure a conviction in a court of law before any financial penalty can be handed down. The consequences of Justice Collins? decision could be staggering and may lead to a full blown constitutional crisis. Constitutional crisis As no doubt many constitutional experts will be aware, on 21 July 1993, the Speaker of The House of Commons issued a reminder to the courts.
• BMW overtakes Mercedes 8 Jul 2004 (Forum)
  JD Power-LMC, the market analyst, predicts that Mercedes will take back the top slot in the full year and increase its lead next year when more models are updated. It forecasts a 17 per cent jump in Mercedes Car Group sales next year to 1.56m, more than a quarter higher than BMW's expected 1.22m.
• Zip merge? That'll be the day... 23 May 2025 (Forum)
        Unless there are two ramrod straight, equal length, queues of cars in perfect parallel formation, a lot of drivers simply will not let another driver in if there's the slightest chance that someone might gain "unfair" advantage and a half second lead over someone who has been queuing patiently for at least three minutes.    I was once severely tooted at for the apparently unpardonable sin of letting two cars in front instead of just the one.
• Tyre performance and tread depth 20 Nov 2024 (Forum)
    I appreciate that as per the article, Michelin and probably some other premium brands are leading the way in this full tyre life technology. There was a great video a couple of years ago on the excellent Tyre reviews website where an almost completely worn Crossclimate was tested against a brand new budget tyre and performed at least if not better in most catagories.
• 2001 Mk2 1.2 16v Petrol - 2001 Mk2 1.2 16v Petrol - turns over, won’t start. 13 Jul 2024 (Forum)
  I added about 3L of petrol today. Attempted to start it multiple times, including with jump leads as the battery got low. Turnover time was about 3 min in total. I assume that should have been plenty to get fuel up to the injectors. I have never had to bleed a petrol system. Maybe bleeding is needed with Clio.
• Daihatsu Skywing - Indicators cross-flashing 3 Mar 2023 (Forum)
  Assuming its something Earthy, I jumpered the Front light Earth terminal to bat -ve, and it started working, as did the wing bulb.  The cross-flashing also went away. The leads to the sidelight are now dead (were OK before) so I'll have to piggy-back it off the front light. Of course the wiring loom is probably knackered (though I don't understand exactly how) and it may well develop new symptoms,'but I'm overdue for inspection, so I'll try for another lashup and hope it holds together for the requisite few hours
• 1986 Daihatsu Skywing - High Beam Fault Finding Tactics 12 Nov 2021 (Forum)
  I'm wondering if I need to try and buy or improvise in-line fuse protection for my jumper leads. Since the currents involved are normally carried by the switch perhaps I can assume they wont be too damaging, even with likely mis-connection?  
• VW CC - Advanced Driving 6 May 2021 (Forum)
  The first one is :"only indicate when you can see someone else that it will benefit" My understanding of the reasoning behind this is that: It prevents one from indicating then absolving oneself of all responsibility thereafter It prevents indication pollution, where everyone is indicating thus leading to confusion It forces one to actively identify every car in the vicinity that would benefit and could become a hazard. The problem i have with this is that I never felt that I was abdicating responsibility, merely informing other road users of my intentions.
• Ford fiesta zetec - Car juddering at low speed 23 Feb 2021 (Forum)
  I've added redex as well. I've just changed the spark plugs and still no change. Tomorrow will be the ignition leads and then coil pack. Can anyone suggest something else??   Don't give me a heart attack, she has already cost me an arm and a leg for things which was caused by sitting around like tyres, steels, balancing, tracking, timing belt etc etc    Thanks all
• SU carb problem - Triumph Bonneville 11 May 2020 (Forum)
  I should also mention that I've had the bike garaged for a few years, and I filled up with LRP (instead of leaded petrol) for the first time ever just before I took it out on this run - I mention this just in case LRP might make a difference to something inside the carb. So my questions really are: 1. If I strip it down, what should I be looking for?
• 2006 Focus 1.6 Ti-VCT - Focus hesitation/stutter 20 Jul 2019 (Forum)
  It doesnt seem to do it at low revs if its in a high gear and I boot it. Ive done the usual, replaced the leads, plugs and coil, there is no water in the plug wells. Ive swapped out the throttle body, MAF sensor and injectors for known good units (thanks to a patient friend) and even had the PCM updated to the latest software and reset the adaptations, but nothing has helped.