the seals in the transmission are shrunk but will expand when the oil gets warm so it will then shift
it could be the coolant temp unit. it senses the engine temp and adjust the throttle occordingly so the engine can easly worm up to operating temp. when i first start my 1990 tracker up, it will idle at around 2,000 rpm until it warms up then it will idle at around 700 rpms. automatic idle switch.Nah. Supprised that your engine hasn't 'gernaded'! Something's mechanically sticking in WOT (wide open thottle) when you first start up; like the throttle plate/accellerator cable???
Often a knock when cold is caused by piston slap, which is pistons rocking in the cylinders until they expand in size when the engine warms up.
Tune up time with fuel and air filters, spark plugs and wires.
The tappets may need adjustment or replacement, due to wear.
No, the O2 sensors are out of the "loop" until the engine warms up.
bad seal/ gasket around fuel injector or intake manifold. as engine warms components expand and form a seal.
this is caused from piston to cyl wall clearance when engine warms up the pistons exspand and the noise is less. DON'T WORRY ABOUT IT
i have a 2000 dodge work van 318 engine when i start in the morning it stalls several times until it warms up then ok
Valves tapping?
belt
The 2006 Ford F2 50 diesel engine might have a bad fuel injector. The injector can cause the engine to not run properly, until the engine warms up.
the oil pressure in the engine rises when the truck is warming up causing the light to show, if continues after the truck has been running, change oil and oil pump.