e99 F250 7.3L 4x4 ccsb 295000 miles. constant p0272, clear it and it comes right back. it pops up on CCT also. I know I need to compression test it and possibly have the injector rebuilt, but which cylinder is it? I have seen that it is cylinder #4 and I have seen that it is Cylinder #4 in the firing order. Is there a difference? Which cylinder/injector should I be concerned about?
P0272 question
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It is actual cylinder #4- second one back on the driver's side.
Do an injector buzz test to make sure the electrical connection is good to the injector and that the solenoid is ok. Any electrical issue should have thrown a corresponding electrical code, but always a good place to start. Next, I would pull the glow plugs and do a compression test and a leak down test if any of the values are out of range. If that is ok, then check for bent / broken pushrods. If everything mechanical is ok, then I would either send the injector out to be tested or swap it with it's neighbor and see if the code follows the injector. If the code moves with the injector - you know what to do.
Do an injector buzz test to make sure the electrical connection is good to the injector and that the solenoid is ok. Any electrical issue should have thrown a corresponding electrical code, but always a good place to start. Next, I would pull the glow plugs and do a compression test and a leak down test if any of the values are out of range. If that is ok, then check for bent / broken pushrods. If everything mechanical is ok, then I would either send the injector out to be tested or swap it with it's neighbor and see if the code follows the injector. If the code moves with the injector - you know what to do.
Well....pulled the valve covers this weekend to do compression testing. The compression tests came out reasonably well (about 350 -360 psi) on all cylinders, I'm guessing thats ok for a 293k mile truck. I did notice that cylinder #4 has a newer "AD" injector. All other injectors were a darker brown "AB". Can "AB" and "AD" be mixed? Can I go all AD without flashing or special Tunes? Is there something else I can check, to see what injectors I should be using?
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Answered in your other thread.
http://www.thedieselstop.com/forums/f24/e99-7-3l-injector-question-614994/#post4405994
Since you're getting a contribution test code, that AD probably actually is an AD injector.
http://www.thedieselstop.com/forums/f24/e99-7-3l-injector-question-614994/#post4405994
Since you're getting a contribution test code, that AD probably actually is an AD injector.
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