Re: POLO 1.4TDI Starting Problem – 12-06-2008, 12:05 AM. Hi, I have the same car. Sounds like your Glow Plugs have packed up. These warm up to a high temperature which enables your engine to ignite the diesel. Note: When you turn your key twice (the dash icons flash up but the engine is still off) - there is a icon of a 'coil wire' which The Most Common VW / AUDI 1.4 TDI (BNM) Engine Problems The BNM engine is a turbocharged 1.4 liter diesel engine. The maximum power of the engine is about 70 hp. s., torque – 155 Nm at 2800 rpm. This in-line ICE has 3 cylinders, 6 valves, as well as a SOHC system. The cylinder block is made of cast iron, the cylinder head is made of aluminum alloy. Basically I have a Polo 1.4 TDI. Not long been a VW owner. Its 2007 1.4 TDI with 40,000 Mileage. I was driving this morning along the bypass come to a junction and went to drop down gear and it was revving high and smoking white smoke. I cut it out, started it again and it started and then eventually started smoking again. This brings us back to the problems of how and when to change gear. The Lupo’s auto-solution doesn’t work too well, and we suspect that, left to their own devices, most Polo TDi drivers will spend too much time in the lower ratios. We found it paid off to operate between 1200 and 1800rpm when accelerating normally. VW should Martin. auto electrical. Vocational, Technical or Tra 1,181 satisfied customers. CL: the dashboard warning lights..temperature..overheating. I have a 1997 Polo 1.4 CL when you start it all the dashboard warning lights turn off, then the temperature warning lamp starts to flash. The car has not … read more. VHHWk0.