[bwood]

the timing can be adjusted but not in the traditional manner and not for performane. On my 98 305 I pulled the dist for an intake gasket job and while putting the dist back in, the tabs that hold the cap on broke. I found a used one from a GM dealer and installed it. I ended up taking it to another GM dealer to have it set because no matter what i did the light came on. Come to find out, the used deal was for a V6. The computer will only adjust it so much. The tech told me that the dist has to be in at +/- 2 degrees from 0 for the light not to come on. It can only be checked with a scanner designed for it. I know this is kind of random but search this forum, there are some more detailed posts.