Injector nozzles - missing

[P4trol]

Recently bit the bullet and got a set of exchange injectors. Now this is the first time I've seen the injector nozzles in the flesh. I note that the new ones have a nice pointy nozzle. The ones I took out (apart from #1) all have the nozzles non existent or half height.

Have they worn down, or were the injector nozzles a different style to begin with?

Is this sort of wear normal or not?

I'm hoping the injector change will solve the lumpy idle it had.


Details and pics: It's a GU 2.8

Reference: A reco'd #1 injector

49189

The old #1 injector - still looks OK apart from the buildup
49190

Old #2
49191

Old #3
49192

Old #4
49193

Old #5
49194

Old #6
49195

[nissannewby]

Operating conditions? Boost egts etc

[P4trol]

Dawes valve 16psi max
compression test OK

No EGT measurements, (but I have both dump pipe and manifold out, and a probe + gauge in the mail. Need to decide on a manifold or dump pipe mounting.)

Took me a while to diagnose a faulty MAF sensor a while back, which would have seen some high EGTs as a result.

Driving conditions here are best described as hot. At the moment it's 38c. To get anywhere usually means at least an hour of highway 100 - 130km/h.

[mudski]

Dawes valve on a 2.8!?

[P4trol]

It was there upon purchase.

[mudski]

You sure its a Dawes and not just a Normal boot controller. The Dawes only work on vacuum controlled turbo's. Yours is boost controlled.

[P4trol]

No I'm not sure. It sure looks like a dawes valve though.

So when other people pull out their injectors, do they look like mine, or like new?

[P4trol]

Asked the turbo specialist today, and they said the wear is what happens after 100-120,000ks without servicing injectors.