Threaded Mode | Linear Mode

mikkhh

(08-08-2025 )DVT873 Wrote: So it went to hell after you put in the injector codes? The Internationals I normally work with don't use injector codes, so I know little about this. BUT if it won't run on the correct codes, maybe somebody HAS messed with the programming. Any chance of putting the origional codes back in and seeing what happens?

Whose injectors? Quality is all over the board on injectors in general. I wouldn't trust anything except Cummins or maybe Bosch.

Truck manufacturer or cummins remans I would trust. But some dealers in my are ask core charge for even new parts.

Have had bad experiences with Bosch reman diesel injectors. One (from set of six) piezoelectric injector electrical side failed 1.5 years after installation. Warranty was only 1 years. So money down the drain. Bought another bosch reman injector to replace it (was in stock at parts store) - but sadly it fas faulty direct from the store, again electrical side defect. After that bought used from junk yard for 1/3rd of reman injector cost, since I needed something to drive with along the warranty time. It took 6 months for them to finally aknowledge it was faulty and issue me a refund.

Some randon place reman commonrail injectors are plain junk most of the times. There are special procedures for assembling those injectors, setting gaps, special tools and so on.

In the past I have replaced injector tips on early 2000s diesel car commonrail injectors, but manufacturers refuse to sell injector spare parts to the general public for newer injectors. Aftermarket chinese injector tips and other parts are complete garbage on commonrail systems, because the pressures involved are up to TEN times bigger compared to conventional diesel injectors and also there are multiple injections per one work cycle so the injectors do way more work than older ones.

With oldschool diesel injectors it was possible to get away with using cheap crappy spare parts, but it is better to forget it on modern stuff.

I have a video that I found on the internet where somebody cuts up a high pressure gasoline injector from china. It looks visually correct on the outside, but inside is missing all the needles and even holes to fit needles and other parts. Trying to upload it somewhere.

But first things first! Pull the programming and have it looked at before replacing bunch of parts.

Here comes a question. What happens if somebody puts in new injector codes (in case ecm requires for those to put in), is there somekind of teach in values that get reset like on cars? And on Bosch car diesel ecm is if you just type in one injector code it erases ALL learned values for injectors. It takes special teach in test drive (arond 30-40 miles) or just drive it with lots of engine braking for 400-500 miles. There are learned uS correction times for injectors at certain pressures, if those learned values at 250bar are at like -20uS to -30uS then there is most likely dripping injectors or somekind of other major fault - heavy soot clogging in intake, swirl flap linkages worn or broken off.

wrench buster

Thanks much for your quick reply. I took your advice and pulled the OLD injector trim codes (from Insite) and input them back into the ECM, and BINGO I could tell just by the way the engine started that was it. I didn't think of doing that early on because the ECM ACCEPTED the New trim codes from the aftermarket injectors And they all passed the pressure and return flow tests. The strange part is EVEN the 2 Cummins remans I had installed on #1 and 2 Cyls. were screwed up and not firing off correctly. To sum it up the engine was misfiring on ALL cyls at all rpm's. When I did the Cyl cancel test on Insite there was only min (150-200 rpm loss on each cyl) and not even the #1 & 2 cyls with Cummins injectors were hitting strong (I figured they would). I don't know if it was 1 or all of the aftermarket injectors that are still installed are the problem. I could enter the trim codes on each cyl (one at a time) and then start the engine to find out. I am just going tom let that ride for now and see what happens. The motor runs strong why fix it? Even though the Cummins remans were almost double the price as internet injectors now I can see why.

Thanks so much