AAZ in a Vanagon. A friend put in new nozzle inserts, ever since then trouble started. Symptoms are long cranking when hot or (especially) warm while white diesel vapor blows out the back. When it finally does fire it blows a thick cloud of white unburned fuel. So I took to letting it idle extensively, however when punching it the cloud of white smoke blows out, like unatomized fuel was collecting in the combustion chamber.
If cold enough for the glow plugs come on it starts up immediately.
Another symptom, when cold is severe bucking, as if no burn in one or more cylinders. Compression is 340, 370, 300, 300.
Runs great when hot at freeway speeds.
WHAT I SUSPECT:My friend didn't do the ‘lapping’ as instructed here, he just took them apart and popped the nozzles in:
https://vincewaldon.com/2008/10/29/how-to-rebuild-diesel-idi-injectors/What I think is happening is the inserts didn't seal because of not lapping, so fuel is leaking down into the combustion chamber all the time, but mostly when idling and off. If I crank it 30 seconds after shutting it off it starts pretty quick, but the longer it sits the longer cranking I can expect. This sounds like fuel draining out of the injector. I don't know exactly what happens inside the injector so I am hoping for some advice. Am I on the right track?