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Message: [QUOTE="rocknmj, post: 1547174, member: 15427"] Anyone ever seen their rail pressure spike after the intake temperature gets a over 87-89 degrees when the engine is under load and about 1800 rpm or higher? My truck runs perfect for the most part but I have noticed that after the intake temp (engine temp is normal) hits about 87 degrees or higher after a couple of minutes that the rail pressure will go from a normal 12-13k psi cruising with a load (pulling, heavy foot, etc) to 18-19k psi. When it does this the injectors get noisy as heck. As soon as you back out a little, it settles back down to what I consider "normal" rail pressure. No codes, no smoke, no excessive EGT etc. Still has power, boost, etc as well. Just rail pressure SPIKE. We just got back from a 2700 mile trip and I watched it the entire way. Seems to only happen after the intake temp reaches that majic number of 87-89 degrees for more than a few minutes. If the outside air is cold enough to keep it below that it doesn't do this weird thing and the rail pressure comes up and goes down nice and smooth with pedal position. Normally when I'm loaded (26000 gross) cruising at 60mph it runs right around 12-13k psi. I cleaned the MAF and the IAT2 sensors but didn't seem to make any difference. Ideas? Sent from my SM-G986U using Tapatalk [/QUOTE]

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