Quote:
Originally Posted by mitch808
I'm not saying you can't. But it's not as simple as dropping the RPM.
Ever play with a carburetor? Ever had a carbureted engine? Remember that choke switch? Same concept.
Basically, raising the RPM is one of the better ways dealing with the unburnt and poorly atomized fuel at startup.
At startup the car runs richer too, to heat up the catalytics faster, etc.
So simply lowering the RPM is not the right approach. Actually addressing fueling, among other tables will be needed.
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Yes I agree, most of the cold start sub-routines are most likely driven by RPM & coolant temp. It should be a pretty simple change, at least it used to be for me. I'm not sure if this car transitions from open loop to closed loop to control fuel trims once it's warmed up or if it just starts in closed loop. Timing tables are driven by RPM & calculated load, which should be practically identical for a small 500 rpm increment that low in the rev range. Being that I have to rely on a 3rd party to tune it, I'll let them figure it out.