[tirwin]

Dave,

Yes, the pressures can be normal and still have those resistance numbers. The WUR has a bimetallic strip inside. On the end of the strip is a plunger. When the car is started, the bimetallic strip gets 12v. There are two different metals - one on each side of the strip (plunger arm). Hence the term bimetallic. The current causes each metal to contract at a different rate which makes the arm bend sort of like flexing a muscle. When the car is first started, that is the cold control pressure. When the strip heats up and the arm bends it closes off the valve in the WUR, the fuel pressure increases (the warm control pressure). When the resistance is low, it just means that the strip heats too quickly making the control pressure rise too fast. The WUR is essentially part of a system designed to replicate a choke. It's job is to richen the mixture when the car is first started until everything is at normal operating temp. If it closes off too fast, it is leaning the mixture before the rest of the engine is ready.