Hey B15 dudes,

I have an unusually fast idle at start up.

like 2500 rpm or so.
After full warm-up, runs fine -- 775 Rpm idle.

Start up idle getting slightly faster as temps drop.

I've:
changed plugs & wires
cleaned the K&N air filter
cleaned the throttle body & MAF
coolant is full, good, and tests to -37
Mobil 1 5w30

No CEL. No codes.

What influences idle to cause this? Coolant sensor? Thermostat?
Again, no codes, no overheating, etc. :confused: