Popping or puffing through the intake has to be either the intake valve not sealing or the exhaust valve not opening or barely opening. White smoke is unburned fuel, usually caused by low compression.
This won't diagnose your problem but it might help you suspect which cylinder(s) are unhealthy. On a cold engine unplug glow plugs and measure resistance of the glow plugs ( tip to ground ) you need good glow plugs for this to work but on a cold engine they should read pretty low or at least below 10 ohms. Now start the engine and warm it up. What happens to the glow is the resistance will increase the hotter they get, a weak cylinder will be colder than a healthy one so you should see low resistance on the suspect cylinder. Typical healthy cylinder will be 15-25ohms and weak/dead cylinder will stay low or under 10 ohms.
An infrared temp gun pointed at each exh manifold runner should identify a weak/dead cylinder too.
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Today's Featured Article - Trailering Your Tractor - by Curtis Von Fange. One of the fun things of summer and fall are the parades and tractor shows that go on across America. Many owners of tractors travel long distances to attend these shows and they usually take their restored iron along with them. Safe trailering practices and inspections will ensure that the event is a fun one. A good habit to develop when using a trailer is to give that �quick look over� before taking it on a trip. Before hooking up to it check the tongue for proper operation. The latche
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