| However, it may be that both conditions are the cause. When I first started looking into this a couple of years ago I thought the only cause was like you said, moisture getting to the pins from the top. But after looking at a few injectors and how the pintles have become loose and can be turned and how the amount of fuel injector failures have increased greatly over the last few years since ethanol has become a common additive, I believe the ethanol is a big part of the problem. I also thought that the two little O-rings may be getting dried out like other rubber parts in the engine bay but after see these O-rings in a couple of injectors still having good permeability it makes me doubt that as being a main cause. It is true that O-rings can shrink with age though. In my case, I had one of my injectors go bad in one of my cars and I replaced it. Then about three months later, all of a sudden I was having problems with three more injectors in the same car. Then, after not using one of my other cars (my CRP TT) for most of the summer, when I stared it I found it had four bad injectors at the same time. Here is a link to an old post of mine where I started looking at the injectors. [ http://www.twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=2218812 ] At any rate, I think it is pretty evident that the main cause of the failure (in our injectors anyway) is due to the lack of connection at the solenoid pins and not contamination of the internal solenoid body causing shorts in the windings.
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21:50:27 01/21/10
