Encountering hard starting on mitsubishi 4d56 engine with rotary i.p. 10,000 kilometers on veg. New glow plugs, new filters, cleaned injectors, new plungers, same problem. Occurs only when engine off for about 6 hours or so.Our climate is not cold. Changing timing belt next but no real sign of wear. Any suggestions? It seems there are a number having same problems. Thanks.

I am pretty sure my problem is the glow plugs. They were new 3 years ago, so...

It sounds like your glow plugs might not be getting juice, or maybe not all of them. Have you checked that they are all hot?

A long shot but on the older VW's system, the fuel could drain out of the rotary Bosch pump, back to the tank, causing hard starting after sitting overnight. The test was to park the car down a steep hill overnight and see how it started the next day. Unlikely it's your problem, but...Phil

Going with what VW cat mentioned, I have a pressure / vacuum gauge on the common fuel line and it always shows a slight vacuum after being purged and parked awhile. One time it read zero pressure and sure enough, there was a loose clamp and air in the system. The tank on my truck is the lowest point in the fuel system so it makes sense that the fuel is trying to drain back into it.

I'd second VW cat's observation.

BMW Fan

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