My '95 has 230,000km (143000mi) on it. I have had it since 117000. As far as I know, the injectors have never been touched. I have noticed the past couple of months that it has had kind of a rough start and the mileage has dropped a bit. Is it possible that the injectors could be wore out or partially plugged or otherwise not performing up to spec? What kind of life can one expect from them? If they are simply dirty, how do the comercial chemical cleaners work, the in-fuel types?
Thanks in advance

Slapshot

My dad's '96 has 250,000 miles and I wonder the same things. I've thought about building my own pop tester per Diesel-Pro's suggested configuration of a bottle jack full of door lock fluid with a bar or psi gauge and associated fittings to put an injector on the end of the gauge so that when you pressure the jack the injector is pressured open and you can see at what psi.

DSG has about 3 shops around Sask, give them a call toll free, there hi-pops are reasonable in price if you need to change yours. I put them in mine but didn't notice any change in performance but think i have either timing issues or a weak IP.

Are they hard to change for a DIY farmer? Do you need any special tools?

I would pick up the correct socket (17mm??, i forgot the size already) with the recesses cut for the return lines so you don't damage them. Pull the turbo for easy access to the passenger side. All of the drivers side can be accessed from standing beside the fender using long extensions. Make sure to get the hose kit with the injectors, you will be swearing you head off while removing the old return fuel lines because of the dinky assed little clips that hold the lines on, i used bent needle nose to get them off, throw those away! DSG will supply you with new hoses that don't require any clips, just push em on.
Plan on spending the day at it if you start first thing. DSG's kit includes the gasket for the oil return line under the turbo and a new gasket for the upper intake plenim. I used neither but have them as spares now.

The socket is a 30mm deep, I think most use the a particular Snapon piece.

i have been thanking about changing mine pretty soon too. i think i should be getting better mileage then i have been lately (13-15). i am going to go with stock ones if i do change them though.

Injectors are usually shot after 200,000 miles or so. Replace them with NEW Delphi or Bosch. Your local fuel injection shop should be able to get you a good price. NAPA sells injectors also, mostly new Delphi in a NAPA box. Insider secret: A lot of "rebuilt" 6.5 injectors they carry are NEW Delphi. May save some bucks there. Make sure when you take it out of the box that the tip has a green cap over it. Green cap means new injector.

On a side note I personally tested about half a dozen new nozzle assemblies on the test stand with a DS4 injection pump at 3,000 RPM. Guess what? None of the injectors put out more fuel at higher pressures. In fact raising pressure decreased fuel output. None performed better than another. All increased delivery at lower pressures, but required a drastic drop in pressure to show any increase. Conclusion: keep it stock.

I'm with DP on this one too. Hi-Pops can only lower fuel quantitys and retard timing, chatter and atomization difference from stock to Hi-Pop is pretty much not existent. Also, higher pressures will wear out the injector faster. I'm de-Hi-Popping mine this weekend.

Ok so we need a low pop set with a good tip for atomizer? :confused:

stock opening pressure, and the injector components just need to be serviceable, i.e. no broken weak springs, worn spindles or spring cages or bad valves.

Guys, what about the so called "Marine" injectors advertised from time to time? Where do those fit into what you're talking about?

Thanks

Steve

marine injectors are usually supposed to be high pop, high flow.

When I built my 18:1 6.5 I discussed at length with a tech at penninsular diesel and he told me my stock 6.2 injectors would flow all the fuel that I wanted and well he was right! My limit to fuel was the injection pump, but I still had plenty of fuel to pour black smoke at will until the turbo spooled up. :muahaha: Larger nozzles would help add some more fuel, but I had enough the way I was as I had exceeded my cooling system capacity in the summer already, and egt's had to be controlled with the right foot.

They will probably flow twice what the factory pump will put out. Most cases , more than enough.