Siren noise under boost, blue smoke and loss of power
- Make and model
- Peugeot 308
- Year
- 2009
- Engine
- 1.6 HDi 110 (9HZ)
- Fuel
- Diesel
- Mileage
- 165,000 km
Customer complaint
A loud whistle that rises with boost, then loss of power and blue smoke when accelerating. The owner had heard a puffing noise from the top of the engine at idle for months.
Fault codes
| Code | Description | Status |
|---|---|---|
| P0299 | Turbocharger/Supercharger "A" Underboost Condition | Confirmed |
Measurements and live data
| Parameter / measurement | Measured | Expected |
|---|---|---|
| Boost, specified / actual, full load 2,500 rpm | 1,950 / 1,350 mbar | actual within about 100 mbar |
| Turbo shaft play | Radial play, blades touching the housing | no contact |
Tests performed
- Turbo oil feed banjo bolt removedFilter screen in the banjo bolt almost completely blocked with carbon
- Injector wells inspected, soapy water at idleBlack carbon crust and bubbles around injector no. 3
- Sump removedOil pickup strainer half blocked with carbon flakes
Solution
Root cause
Turbo bearings failed from oil starvation: carbon from a leaking injector washer got into the oil and blocked the turbo oil feed filter and the sump strainer.
Repair
New turbo with the updated oil feed pipe kit, sump and pickup strainer cleaned, oil cooler flushed, new oil and filter. Injector no. 3 removed, seat cleaned, new washer and clamp bolt torqued to specification. Oil cleaned out of the intercooler.
Parts
Turbo, oil feed pipe kit, injector washer and bolt, gaskets, oil and filter
Labour time
7 h
Lesson learned
On this engine a new turbo alone fails again within weeks if the carbon source (the injector washer) and the blocked oil feed are not fixed.
Training case: the usual fix for this fault, not a confirmed repair on a specific car.
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