My website has been out for a while now and i had a PR of 2 since last year, than 2 days ago all my pages lost pagerank except the main page which is a PR of 1 now. I have no idea why, but my rankings on google are still getting better. http://portlandsauto.com do you guys have any idea why that would happen? I been building backlinks the last few months, should be getting better not worse.
I noticed on the last update that a couple of my sites lost their PR while the update was occurring then came back a couple days later. Hopefully that is what is going on with your site.
are you linking to bad neighborhoods by chance? Have you checked your affiliates websites and made sure they still have a PR? you could try this tool out: http://www.seoworkers.com/tools/analyzer.html it tells you if there's anything wrong with your sites keyword density/relevancy/meta/internal links/backlinks/etc.
The problem could be in your backlinks profile, check the sites to see if some stop linking to you. Or it could be that some of those sites got hit with a penalty and are now passing less pr.
May be the pages content changed. Google makes also update that may affect your page rank. If website having backlinks to your site close, that will affect your PR. These websites may have lost PR that was important to yours. This kind of situation happened to me too, but I am still receiving good traffic.
No matter what the reason is, don't worry about it. PR is absolutely useless, it is an arbitrary indicator that is imposed on billions of web pages. When it changes it typically has nothing to do with your site, it is a slight change in the algorithm Google uses and it happens to not be in your favor. That would be like if my property taxes went up, and I didn't ask if my neighbor's did as well. Don't worry about it, just watch the SERPs
What linkbuilding methods have you been doing for the site? You lost PR maybe because the links you've built are not quality ones. Don't bothered too much about PR. Ranking is more important.
Somebody correct me if I'm wrong, but I believe that the entire internet maintains an average pagerank of 1. That means that every time one site goes up, the page rank has to come from somewhere. Also, the more websites there are on the net, the less pagerank the average site will be. This would explain why a PR 4-5 now seems to be enough to get you to the top for well searched for keywords. This also would mean that even if you maintain all your current backlinks, your PR will eventually decline as a result of all the thousands of new websites that emerge on the net each day. Regardless if this is true or not, the only way to ensure your site stays the same or increases is to keep acquiring more backlinks.