Ask Honest John

Most recently answered running problems questions
Do you have any advice as to why my Citroen Xsara 1.4 petrol won’t rev properly? I’ve changed the throttle body and added fuel treatment. It runs and drives but it just won’t give a full rev as if it’s...
The night before last I drove, with a friend, to a meeting about 10 miles away in my recently-purchased Citroen 2008 C5 2.0 HDI 138 Automatic, 61,000 miles on the clock. Three hours later, when I switched...
I have a Citroen Berlingo 1.9-litre diesel van (with the XUD engine), and have recently found that it's lacking power. I've had the fuel injector pump and cambelt replaced, and timing looked at, as recommended...
I have a Citroen C3, which I've had since new, she's a 1.4 petrol (Desire Model) Within the first couple of years I had major issues with the fuel injectors and she was backwards and forwards to the...
I recently purchased the above car from a Vauxhall dealer. Having read your columns and back room all the negative press about DMF's has got me thinking. I notice that when I accelarate through the gears...
Some 2-3 weeks ago you ran a letter about problems with diesel fuel blockage caused by the addition of biodiesel to standard diesel and lack of use of the vehicle. I have a smallholding and two tractors...
My 1.8litre Duratec Mondeo is suffering from poor acceleration and high fuel consumption. I have changed the spark plugs & fuel filter, but it has made no difference, do you have any suggestions? Could...
We have had a problem with the steering column and ESP sensor of our 2008/58 Vauxhall Meriva 1.3CDTI. We bought the car brand new in February 2009. We first had this problem with the ESP light coming on...
I have the 2.0-litre petrol 2001 Ford Mondeo Duratec. It has suddenly started to misfire and bring out an awful eggy smell, then the engine light came on and it started to run roughly. I've replaced the...
This afternoon my X-reg 1.4-litre Mazda 323 died. The engine starts but will not run, it's as if the ignition is being switched off. I'm guessing there is a very special piece of technology that keeps...