Contour Enthusiasts Group Archives Forums General Troubleshooting Cold Start Misfires - Coolant temp sens. Question

I tried the non UIM removal and afterwards pulled my UIM. It was still covered in carbon and so were the secondaries.
I only do a full removal to clean it.
The non method is ok if your maintaining the system after a full removal and cleaning.

Have you thought about doing a Motorvac fuel system cleaning?