I've just realized that the fuel injection system in the Commodore is leaking. The injectors have rubber o-rings to seal them into the inlet manifold, and also to seal the fuel rail to the top of them. I was messing around with them yesterday, moved one a bit and fuel started coming out from under the fuel rail. I then realized they were all loose, and if the top ones are loose, then the identical bottom o-ring seals must be stuffed aswell.
The engine has been idleing a bit rough, and sometimes doesn't start instantly (takes a few seconds of cranking). I'm now sure it's a vacuum leak getting past these seals, and probably low fuel preassure caused by the fuel leaking from the fuel rail. Interestingly enough, the fuel leaking from the rail is not visible unless it's a large leak, as when the fuel comes out under pressure it vapourises instantaneously and is hard to detect. It's easier to listen for.
I went doen to Hunter Holden (These guys are great, never not had a part in stock) and for $27.95 got a Bosch injector and fuel rail seal kit. It has all the injector o-rings, and also some for the cross part of the fuel rail.
So tomorrow, the whole lot is coming off, getting cleaned, and put togeather with new seals. I'm just hoping that all the injectors are okay, although I'm looking at getting another set and having them reconditioned.
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