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The timing is set by the PCM/ECM The crank position sensor located on the lower front passenger side right behind the harmonic balancer controls the firing to the plugs, while the cam position sensor located under the distributer cap controls the injector timing. These Vortec engines are a different animal. All you can do is to get the #1 cylinder on top dead center make sure that the timing mark on th crank is pointing at the notch, remove the distributer cap and make sure that the rotor is pointing at #1 and that's it there is no other adjustement, the ECM does it all.

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Q: How do you set the timing on a 1998 4.3 liter V6 Chevrolet?
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