Code p1211 help?? - Ford Powerstroke Diesel Forum
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Old 05-29-2013, 10:50 AM
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Code p1211 help??

I Have a 99 350sd 7.3 with 558,000 on it. It was running weak ad surging while loaded. I replaced 6 injectors supply pump filter, it ran better but still surged under load. I had "good" looked almost new hpop and ipr. I replaced the irp and my truck ran good for about 15,000 miles. Now it's started coding P1211 inj. pres. higher or lower than desired. When I came to and idle after driving a short distance the motor had a "Roll" to it. i cut ingnition off and restarted it and ran ok till it started to act up agian. The inj pressure was running 750-925 psi and the pres. percent was like 5% normally it runs about 490-525 at idle with 9-12% and when running under load the percent was 35-65%. Any ideas? I replaced the ICP sensor about a year ago also. soemtimes it runs ok nbut has been getting frequent on acting up.
Wonder could this "new" IPR be sticking or something? I had it on my shelf for a few years but looks like new when I put it in?
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