Rough idle/vibration

[CarlosA]

Will do. So far i`ve only made improvements on the *noise*. Not so much on the feel.

[TylerDurden]

I might start messing with delivery valves. I don't know how to "balance" them; but AIUI, they do subtly effect injection timing.

[CarlosA]

I might start messing with delivery valves. I don't know how to "balance" them; but AIUI, they do subtly effect injection timing.

I have found shims for them, I am sure with an adapter made on a lathe you could test them. I think it would be more of a flow @ pressure test rather than a pop, since they don't open when hitting a certain pressure like a nozzle does.

[TylerDurden]

If I understand correctly, they are essentially check-valves to maintain static pressure in the lines between pump pulses.

Thinkin out loud...

Maybe a pop-test could be revealing if the delivery valves were placed inline - but the gauge would need to be between the Delivery Valve and the injector(same one is used to test all DVs):
Pump>Delivery Valves>Gauge>Line>injector

Pump until break/spray, read the gauge and watch for any leakdown. Compare readings between DVs.

[CarlosA]

Good idea about the leak down - if they are worn that could be a big issue to the entire system. I have another set, i`ll swap them and see if it makes any difference - certainly can`t hurt to try.

[gldgti]

I've just been battling vibrations in my cabriolet with turbo'd 1Y engine too - but I've got it pretty nice and smooth now. The mounts I'm using are all OEM factory, all new except for the gearbox main mount, with the front radiator support mount being one of the larger diameter rubber ones that GAP sells.

Basically the process should be to remove the rear gearbox mount and the radiator support panel mount and let the engine settle on the two main mounts where it pleases. Then bolt up the rear gearbox mount using the slotted holes so that the engine is still sitting neutrally - then finally bolt up the radiator support mount with the 2 bolts on the chassis side loose, then tighten them after the mount has found the perfect neutral spot.

After I did all this its idling very smooth and right through the rev range.

FYI - i have a lightened machined but not balanced flywheel injectors that have not been balanced either.