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Agreeing with @Zaid on con rod deformation. The only way you are going to be able to tell is by taking it apart. I don't think I worry too much about pulling the diff to get the sump out, but just pulling the entire engine. If you are seeing that the piston is not reaching it's potential inside of the bore, you have something going on in the bottom end which ...


3

I'm thinking @SteveMatthews may be onto something - If the HVAC system is vacuum operated, one of the vacuum actuators is having an issue (ie: leaking). It may be getting adjusted without you having to do anything. When you shift gears, you take your foot off of the "go pedal" (not a gas pedal in this instance because it's diesel power ;-)), which causes a ...


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I'm thinking your issue is due in part to two things: Glow plugs - Either you aren't letting them warm up enough or one or more are bad Battery - If you battery truly is at 50%, this may not be enough to get the glow plugs up to operating temperature during initial glow plug warm up. Having the battery tested may be a good start point here.


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Classic fuel starvation, probably caused by an old, gummed up fuel filter. Replace the fuel filter and purge the injectors (remove them from the head, crank the engine a few times and clean the injectors thoroughly). If this doesn't solve things get the fault codes read as it could be something like a problem with the injector loom.


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Diesels have never absolutely needed it - even on older diesels, they'd still usually start without waiting for the glow plugs. However it does make it very much easier for the engine, so starting will be easier in adverse conditions (cold/altitude) where otherwise the engine might not catch. Also you'll find the engine runs rough for a few seconds until ...


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I have both a 2004 Bora TDI (Jetta Mk4 in the US) and a 2012 Mk6 TDI Golf. When either of these cars requires it's warm up system, it will automatically switch it on for the time it needs. This is signified by the glow plug light illumination on the dashboard: Once it's up to the temperature it requires, the light goes out and the car can be started. I ...


3

I believe you have a fundamental flaw in your thinking. The combustion event is controlled by when it is (direct) injected into the combustion chamber. This controls the timing of the event, not the cetane rating or any other factor of the fuel itself. There are other factors which control the burn rate, such as: shape of the piston; shape of the combustion ...



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