Quote Originally Posted by Pumper View Post
Steve,
I believe also it is in the ECU...Fuel injection has a cold start circuit. That is controlled through the ECM of whatever vehicle it is.
Cold start stumbles, typically are a result of misinformation being sent (sensor) to the ECM. Hence the ECM will produce a lean condition.

Sensors are hard to diag. as they have gremlins and we all know how hard they are to catch...


Has anyone had a code thrown due to the stumble??
There would be no code since the ECU thinks its doing what its supposed to.
I read a lot about this before I got mine. It is programed that way, And Honda will do nothing under warrantee.
There are even units designed to fool it into thinking its seeing a different air temp than what it actually is.
But I guess they don't always work.
Its the air temp to fuel ratio thats causing the stumble.
The ECU is cutting the fuel mixture down before its warmed up enough.
They have this all figured out when you get the reflash done.
Getting my reflash done this fall.