Power loss uphill — compression check

Tags: #diagnostics

Possible causes and the diagnostic path. Loss of power when climbing hills can indicate one of several underlying issues: valve clearance problems (see the valve-lifter/shim-adjustment card for the mechanical-lifter background), carbon buildup on the intake, or reduced cylinder compression. A compression test is the way to gauge severity and narrow down the cause: normal reading is 8.0-9.2 bar per cylinder. One owner's diagnostic sequence: perform a hydrogen-carbon cleaning treatment first, then re-check compression — if compression improves after cleaning, the carbon buildup was the (or a) cause; if compression remains low and unchanged, the problem is likely mechanical (valve or ring wear) and cleaning alone won't fix it, pointing toward valve work instead¹²³.

Revs rise but the car does not pull (reported symptom). An owner reports that when accelerating off a dirt road onto asphalt the revs climb without the car gaining speed, only under power and not while coasting. Members suggest checking the drive shafts (привода) first; on a manual car this symptom would point to clutch slip. Switching to manual mode (Tiptronic) for the pull-out is a temporary workaround, and high revs without thrust in D could mean serious automatic transmission damage⁴⁵⁶⁷.

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Sources

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Last updated: 2026-10-29