P1211, WTF

[MeTo]

My IH long block has about 74,000 miles on it and the baby Swamp's injectors have about 300 miles on them. I had my TS6 reburned with Swamp's tunes. I just changed oil from Rotella 15x40 to Rotella T6 5w40 full synthetic. Now I'm getting the P1211 code and CEL. I did not get the code before the oil change. I cleaned and installed new o-rings in the IPR; still getting the error code. All this happened on the economy tune. When Performance Diesel installed the injectors (compression test good), they stated the HPOP would put out about 3100 psi on the TS6 generic tunes. Is it a coincidence?

 

[ghohouston]

Are you running a stock 15 degree hpop?

 

[MeTo]

Yes, I removed the chip and still got the P1211 code.

It was the synthetic 5w40 oil. I changed back to the Rotella 15w40 i saved and did a test drive. I hocked on our cargo trailer (boondocker) and put on some highway miles and the steepest hill in our area at WOT. No CEL or codes! The engine and injectors definitely are more quiet now.

Is it all the oil's fault? I can't say that at this point. Before the injectors were installed, I had a compression test done. All cylinders were within 5 psi of 360. That's for a long block with 74,000 miles on it. BUT, the truck did sit for all most 5 years when I purchased it. I have put on about 550 miles since.