Just got through testing one of the wildest idea's I have ever had and it works great. While road testing and tuning the EFI system on my truck we experienced a cold weather drivability issue. We made several changes to the tune and every time we backed out of the garage and took off it was fine, but within a 1/2 mile or so the problem would return. We decided to return to a tune that we had used on an earlier test session that had worked fine. Same results. This was a particularly cold night and we finally decided that the intake manifold was too cold. What was happening is when we pulled into the heated garage to program a new computer chip the intake would heat soak from the engine block so when we fired up for another test drive it would run fine until the manifold chilled down again. It seems I had underestimated the importance of manifold heat. I am using an Edmunds manifold that has a steel tube cast into it for running engine coolant through to heat the manifold. Since I am using that cavity to run my idle air supply through that is no longer an option. Then I had this crazy idea that I could use some diesel engine glow plugs to heat the manifold. It works! Please excuse the wiring. It is only temporary. Also, I am going to use glow plugs with a threaded stud to attach the wire. That should make it a little less obvious.
