What does it smell like? Burnt oil and incomplete combusted diesel smell different, as does anti-freeze steam. If the IP and injectors were original to the core motor its a safe bet that they are in need of some freshening up.
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83 D24T 245 .50mm oversized pistons, 3 inch exhaust, but otherwise stock except the boost is turned up to 20 psi. 81 VW Caddy 1.6TD with some minor head work, and big exhaust.
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