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Message: [QUOTE="Black 02, post: 1331707, member: 6916"] Maybe this can help. Anytime I run the truck over 2200 RPM steady, the check engine light comes on. I keep getting these codes. P1211 ICP Higher/Lower Than Desired U1262 SCP (J1850) Communication Bus Fault U1027 SCP (J1850) Invalid or Missing Data for Engine RPM B1352 Ignition Key-In Failure Also, tonight I was data logging and noticed that the ICP would spike over 1000 psi and the injectors would start making more noise. I got this weird anomaly after the check engine light came on. With the RPM and ICP steady, the duty cycle began climbing. It kept climbing up to almost 50% and then the ICP spiked to 3500 psi and the duty cycle dropped. What would cause this? Bad HPOP? Leaking injectors? It seems more noticeable when the engine is warm. Here's a chart of the ICP and duty cycle. [ATTACH=full]160686[/ATTACH] [/QUOTE]

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