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Old 12-27-2013, 01:13 PM   #1
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Boost and oil pressure sensors

Question: On a 2005 C7 engine with 72000 miles: Every so often the dash warning lights come on warning to stop engine. The ecm reading from a cat tech computer says it is from an erratic boost signal, another says high boost from the turbo.
When this occurs the scan gauge D says that indeed I have high boost, 28-31 pounds of boost, BUT every time this occurs the reported OIL pressure is also reporting about 10 pounds more that normal. The dash lights come on after the oil pressure jumps followed by the boost. This also seems to occur after I have stopped for a short time, ie getting fuel, lunch, etc.
If I over ride the dash signal, after a few miles the oil pressure drops to normal and the boost drops to normal. It seems to be a heat soak thing from when I stopped after running the engine at normal temperatures.
I am tempted to replace both oil and boost sensors but at $145 each I don't want to throw parts at it.
Both of these sensors are part of HEUI system so it seems to me if one is failing the whole system might see funky numbers.
Any words of wisdom other than take it to a cat shop??
I did have this problem early this year, but when I found holes in the turbo actuation air line I thought I solved the mystery. Apparently not.
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Old 12-29-2013, 10:37 PM   #2
Yaj
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I don't know anything about the computer controlled diesels, but if you had the same problem before, and solved it by repairing some leaks, I would look at the same systems again for similar problems.
Last summer I replaced a rubber hose that controlled my turbo wastegate, then a view hundred miles later the steel pipe that the hose connected to broke off at its mounting place. That one was easy to find as it was just hanging there above the turbo.
Good Luck!
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