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On 18 Apr 99, at 10:04, Jake Kooser wrote: > What do you get? When RC > receives the injectors, they test them for flow rate (as received), then > they remove the plastic tip around the needle, clean the whole works > ultrasonically then rebuild the injector. Then they test it a second time > to verify an improvement. You can remove that plastic tip yourself with your fingers; there's no trick to it. If you do that you will see that it has really gotten you nowhere--all the important works are farther inside where you still can't get at them. According to the teÌIB/ they sent me with the > injectors, my 4 injectors flowed an average of 337.6 cc/min (@43 PSI) before > cleaning with 2.6% difference in flow between them. Afterwards, the > injectors flowed an average of 344.8 cc/min (@43 PSI)with only .2% > difference in flow. They also paint the body of the injectors (I believe), > because they are all a nice uniform grey color. 2% difference is better than I would have expected; 0.2% strikes me as better than the precision to which this could normally be measured. Why 43 psi when they run at 28-30? I have to agree with Keith. Bosch says to just pull them out still connected to the wiring harness and the fuel line. Then, WITH THE COIL DISCONNECTED, have someone crank the engine with the starter while you watch the spray pattern. Bad injectors are usually obvious. The rust around the o-rings that Keith mentioned is half right. The other half is that Bosch apparently choose a poor material for the o- ring so it shrinks with time and stops sealing. I have seen companies that claimed to rebuild these injectors, but it it is a major job. You have to machine away part of the central metal body to remove the crimp, then pull the guts out of each end and clean them up. Then put the parts back in a NEW body and mold a new plastic connector end over the back end. I have a couple of injectors that I cut open just to see how they were made inside. It's really very interesting, and not at all obvious. I have seen some injectors with a different shape of plastic connector body, I don't know if those were actually rebuilt, or just someone else's product. In most cases, I think what you get with a "rebuilt" injector is some cleaning, a paint job, and a fresh piece of hose. I replace the hoses myself any time I'm replacing the hoses in the engine compartment. Jim - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Search ol¬Òvµes on the Web! Visit http://www.vwtype3.org/list/