328 WUR

How can I determine if my WUR on my '89 328 is faulty? I have a stumble when the car is cold. It runs great once warmed up, but when it's cold and I first mash the accelerator it hesitates. My first instinct says WUR, but I don't to replace it if that's not the cause. Suggestions?

 

The fuel filter, ignition wires, plugs, distibutor rotors, were all replaced recently during the major service. That's why I was assuming something with the wur (or yes, the auxilary, cold start system, etc.).

Unfortunately, I don't have a professional in my area, so I "have" to be a DIYer. I say "have" because that's really the way I prefer it. Judging by the service I get in EVERY other aspect of Alabama life, I don't think I'd trust anyone else around here to wrench on my car. However, FI systems and controls is not an area I'm very familiar with. So I may have to enlist the help of "pros" on this one.

 

I'm in Huntsville....a long way from the coast. I do have one last resort here....a guy that works at Porsche/BMW who used to maintain a personal Ferrari collection in Florida. He'll come to the house, but all his tools are at the shop and then it becomes "I'll come back next week with tool A". More reason for me to get more tools. ;-) What I also need is a vacuum pump and gauges so I can overhaul my A/C system which is not functioning right now. Oh, and I need to get a ring nut socket to fix the horn wire that a local "pro" stereo installer broke. And on and on it goes.....

Much as Boeing keeps a backlog of aircraft orders so they are ensured work in the future...so too do I keep a backlog of maintenance projects so I don't run out of work in the future.