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Power Strokes
7.3 Aftermarket
injector help
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[QUOTE="TARM, post: 475685, member: 578"] Some thoughts reviewing everything you have posted up as far as info goes: I would not be going off the contribution test results with injectors that are not "broken in" per se. ( purged of air i.e at least 50 miles of actual driving) I do not believe you can get a good accurate and consistent contribution test result without the injectors oil side fully purged of air etc.. The contribution test measure the timing and rotation velocity of the cam gear ..........which the entire cylinder effects this, but even if we went only with the effect of just the injector itself..... An injector with air in it is going to fire differently thus effecting the cylinders output as measured by the CPS reading the cam gear rotational specs. Could a injector have an issue sure it COULD, its mechinical and that stuff can break or maybe not been built just right. At the same time there is no way to be sure if you do not give it a chance to clear the air so you can remove that possibility off the table. Its not the Solenoid or armature clearance as you say they past the buzz test. You have ohm'd the wiring so it checks out. The reports you are getting on the contribution test do not IMO support a single injector issue, as if it was, there would be a consistent single injector that the problem was with and it would follow that and only that injector. Both 6 @ 8 failed and then you pulled and reinstalled swapping all the injectors around within each bank. It was not indicated if you actually mapped where each one went from each original hole on the swap. You then ended up with 1&3 failed. Then you swapped 1 and 3 with each other which were BOTH failing and now 1 is the only one failing? How did the other fix itself? In the beginning it was 6&8 then 1&3 and now just 1. What is more likely to be happening: 1: Some bad injectors have fixed themselves or otherwise worked out their issues leaving only one that seems to be actually need some help. 2: Air is slowly moving thru the system and working its way out as well as being effected by the various pulling and swapping around of injectors and thus effecting the way the injectors are firing which is effecting the results of the contribution test. It could be possible a combo of both but again no way to be sure without eliminating the possibility of air. If this was a severe miss I would think you should be able to easily follow it by sound alone with the VC off. Also want to point out that the new versions of the CPS all can cause some cylinders to fail the test when there is nothing mechanically wrong except with the damn cheap @ss CPS itself. So nothing wrong within the cylinders. Another is when injectors are first installed and even then you can sometimes run a number of contribution tests and get varying reports. It sometimes takes a number of runs to get a consistent reading. [/QUOTE]
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