So, decided to throw a few more parts at the 911, because... why not... so far they're pretty cheap.
Got a Bosch 3.8bar fuel pressure regulator for about $50, as I had a suspicion the old FPR wasn't great - the vacuum tube was a little wet.
Removed old FPR - used needlenosed plier to remove the retaining clip, and the old FPR wedged in pretty tight, so yeeted it out with some pliers. You can see a drop of dirty old fuel dripping from the vacuum port which is no good.
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New replacement fuel pressur regulator. Push it into the fuel rail, and press down on it while reinserting the retaining clip.
Started up again - still terrible idle and stalling almost immediately after starting. Interestingly, getting some different codes. P1602 is because I disconnected the battery for an hour. P0341 is camshaft sensor to bank 1 - actually, I've been ignoring the code for a couple of years now.
P1514 is to do with the idle air control valve - haven't had that code before, and I've only jsut removed, cleaned and tested it and replaced it.
Anyway, next thing to do, I grabbed my fuel pressure tester and hooked it up the the fuel rail over Bank 2.
With key in, engine off and fuel pump on, we get a solid 3.3bar that doesn't fall away.
With engine running, and foot holding the throttle open a bit, we get 3.8bar as expected
So... i'm thinking the fuel pump is good, new fuel pressure regulator is good... erm - worth checking the fuel injectors? Doesn't seem like a big deal to remove them and visually inspect at least. Just drop the engine a couple of inches and remove a few wiring plugs and bolts. Maybe next weekend.
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