Originally Posted by Dark Stone
Great explination Bucko...
Is it true that the injector leaking is "no big deal" thanks...
To me it would be a big deal; if an injector is leaking down, it means it's dumping fuel into that cylinder. Maybe a small amount depending on how bad that injector is, but any amount over a period of time is contaminating that cylinder with raw fuel, washing away the film of oil for that cylinder. It's well known that a cold startup of any gasoline engine causes an initial "metal on metal" wear, until the oil pump has come up to pressure and is circulating oil. Again, we would be splitting hairs as to how much wear this really is during an initial cold startup, but in this case it may be worth getting the injector(s) checked and cleaned if in fact they are the cause of his slow start condition.
Always tough to do an "internet diagnostic", but his symptoms do lead to an injector leakdown condition as a possibility. One way to test is to connect a fuel pressure gauge on the fuel delivery line to the fuel rails. Most engines have a connector to do this. Then start and run the engine for a few minutes, then shut it off. Pressure should hold and the guage will show this. If the guage begins to show a drop in pressure when the engine is off, that can be an indication of an injector leaking down. It can be other things too, such as a fuel pressure regulator: this is a valve that diverts fuel back to the gas tank during de-excelleration or light load (cruising) driving. The fuel pressure regulator does as it's name implies, it keeps the fuel pressure in the fuel lines/fuel rails at a constant pressure, and diverts fuel back to the gas tank as to not "over pressure" the fuel delivery system (such as the injectors).
There's good reading material to be had at the book stores on the basics of fuel injection. This really is not hard stuff. I've sat my butt down at these book stores (they usually have a coffee shop) and I'll read about this on rainy days when my wife wants to go to the mall. I hate that part, so reading about autos will usually get me to go with her. Good thing they don't serve beer....I'd never learn anything!