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Being a TDI mechanic for three years and changing countless timing belts the ECM must see a proper air to fuel ratio adjusted (with in timings dependant on the cams intake fuel compress and vent exhaust) via the cam sprockets set tooth distance on “REAL” TDC after the belt has been installed it cannot be out by more then 20-35% timing between detecting an A/F ratio from the o2 if it is out it’s because the o2 has picked up on either wet exhaust (rich), very dry exhaust (lean) there for must be reset on the camshaft TDC then loosen the lock nuts on the cam and then adjust the crankshaft to TDC so that the whole system is at TDC if your cam cannot be set back to TDC loosen the belt and re adjust a tooth forward or backward depending how lean or rich the mix was.
 
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