I have an issue where when I start my car after sitting for hours, it'll start right up, sit at 1000ish RPM for a second or two then drop like a rock down to 3-400 occasionally stalling. It starts right up the second time, every time. It happens every time i let the car sit overnight, the first start of the day is a guarantee. You can let it sit a hour and it'll be fine, I'm lost on this one. I primed the fuel pump using scanner a few times to rule out delayed fuel pressure, and same result. I read somewhere someone with a similar issue had to change there injector offset from vacuum to MAP, in my case the car wouldn't start, but there's no data for id1300s i don't believe for vs MAP.
Also have a issue where fuel trims want to go negative on cold starts, until it makes it up to operating temp, to where they then fall in line. This hasn't bothered me as much but its still odd, and possibly related to the start problem? Id appreciate any input.
The starting issue started after I changed the fuel system to a return, boost referenced setup, with id1300s put in at the same time.
edit : just noticed the commanded EQ shoots rich, while its falling on its face.. down in the .6 lambda range, then goes back to .8 after it finds idle again, I cant seem to find the section on where you adjust commanded EQ for warmup, and I don't know if that's the cause, or the effect of the issue. Also noticed it recovers as the alternator starts charging, if you take a look at the voltage in the PID list. I've been having issues where the car will bog for a second when the radiator fans kick on, so a failing alternator is a possibility.
cold start problem.hpl
main5.hpt