Ray,
I orginally put the +4's in about 50Kmi. ago when they first came out and they've worked beautifully since. This current problem is pretty much an overnight change in the way the engine is running. If I hadn't just spent almost $40 on the plugs and an hour installing them, I'd change them for the Autolights.
....btw, I certainly did go through the archives. As expected, I did see many posts of people using the +4's with good results...and also those that didn't like them. I seem to fall into the former camp.
I'll check my factory tech manual for the CPK and CMP tests. Thanks.
As for the coolant temp sensor....that's definately an interesting one since I've been seeing some weird variances on the coolant temp guage over the last couple months. In the past years, it's stayed rock solid midway. Then lately, it started going higher. Now, it sits just before the N in NORMAL for nearly 90% of the time.
