Quote:
Originally Posted by Ryephile
Ok cool.
The only reason from a calibration side I would allow for long crank is to prime the oiling system.
If someone can datalog rail pressure and injector pulsewidth during cranking, that would put a lid on the situation really quick. I'm away right now so it'll be a bit before I can get back to my car and datalog it myself.
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I have an HP tuner's scanner log somewhere of this long startup (more than one actually). I can tell you it is absolutely the high-pressure fuel pump that's the hold-up. The injectors don't pulse until the fuel pressure reaches a certain threshold. (It's completely normal and there's not much that can/should be done to improve it from a tune perspective as far as I know.)
I discovered in my case that the perceived elapsed time is much longer than the actual elapsed time. My car on occasion sounded like it would crank forever before starting, but when I actually logged it the time never exceeded the GM specs (previously posted).
(If I remember I'll post the log when I get home this evening.)