Question about 2003 Volkswagen Jetta TDI
Check the spark plugs, I have seen several VW turbos with this problem. The aluminum heads expand and contract to fast and crack the porcelain on the plug causing the engine to misfire when the turbo spools up and makes boost. The misfire drops the engine and trans into a "safe mode" where it loses power.
Posted on Apr 01, 2011
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Posted on Jan 02, 2017
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