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2026. 6. 30. 작업

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Troubleshooting Low Turbo Boost

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Some thoughts on how to verify if you have... an intake obstruction Disconnect the air filter (keep the MAF in place) to expose the compressor inlet and log boost values with the car at idle and under load. If the boost numbers are close to what the engine computer is expecting then this would confirm that something upstream the MAF is obstructing the intake. an exhaust obstruction The most convenient spot to probe for exhaust back pressure would be the upstream O2 sensor location. Unscrew the O2 sensor and put in a pressure gauge to probe how much back pressure there is. carbon build-up on the turbine vanes Spinning the turbo shaft by hand won't tell you much besides confirming that the bearings are OK at very, very low RPM. I can't think of anything short of a turbo teardown to confirm if carbon build-up is an issue (unless you can get a borescope in there). Possibilities not enough vacuum from the engine (Based on the comments, this is pretty much ruled out) incorrect VGT actuation