Having problems with your 2000 Volvo S40 ?
Hissing noise from engine when turbo kicks in and loss of power,51 plate 1.9 volvo s40 diesel
Check intercooler pipes for splits or holes dont think turbo is at fault you must check pipes carefully remove if you have to to check
Repair Help & Product Troubleshooting for 2000 Volvo S40
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