Back to Basics: Cam Belts and Chains

This is a familiar subject, but one worthy of a fresh review. A key part of any car engine is the drive mechanism that operates the camshaft, which in turn operates the inlet and exhaust valves. With nearly all diesel engines, the high compression ratio, and therefore the relatively small combustion space, means that if […]

Heavy smoker

I have a Golf Mk4 1.9 TDI 150 diesel which generally performs fairly well but, from cold, especially after a cold night, emits white smoke and smells of diesel fuel. All seems fine when it warms up. It is less obvious in the summer. The engine is not especially noisy and fuel economy seems reasonable […]

Something in the air

There have been some accusations, recently, in the media, about diesel cars being responsible for the recent smog and an unhealthy air quality, apparently leading to respiratory problems for many people. Could the Doctor summarise the situation for me and other readers, as to whether it all makes sense, or is pure scaremongering? Does this […]

Limping home

As an avid reader of your magazine, I wonder if you can help me with the following problem I am experiencing with my 2008 Mercedes-Benz E 320 CDI. The turbo has (only apparently! Doc.) stopped working, the car will accelerate very, very slowly, so therefore I am rather afraid to overtake. If I pull into […]

Vel Satis update

Regarding my stuttering Vel Satis (Issue 323), the car went to the dealer for a diagnostic check, as planned. There was an error code registered for a faulty EGR valve. The garage would prefer to fix this first, but with no guarantee that it will necessarily fix the current problem, and then look again to […]

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