Cold weather misfire?

It would help if you told us what motor you have...When it's cold, trucks run that way. I wouldn't worry about it.

 

Its normal for a Cat. My 06 did the same thing untill it reached 150 degrees. Had it at cat and they said it is in cold mode untill it reached around 150. My truck would do it below 40 degrees.

 

Are you sure it never does this when it's warm? My sdp does something like that every now and then. When you romp on it there is a slight hesitation . Just for a milla second. Then all is well. And it only happens once in a while. Warm or cold.

When your truck is cold, does it do it every time you step on it? If it does this is way different then what mine does.

Good luck!

 

Let it warm up, it's not a gas engine, it needs heat in the cylinders to fire, if it's cold, it won't fire right.

 

The VVA's can't work correctly with the cold(thick) oil. My BXS does it too. Doesn't quit until oil gets about 140-150 deg.Your only choices are drive it very easy til the oil warms up or change oil to 0/40 synthetic.

 

my bridge cat did it too with a fuel in winter . if your running one that could possibly be problem

 

The emissions system (IVA) don't start working until the ECM sees that coolant temp is over about 160*. Before that the ECM is running the engine in what another poster described as a cold mode. The slight miss fire the OP is describing is normal till the ECM sees the higher coolant temps. My highly modified ACERT has a large miss under load until the ECM goes into a normal run program.