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there is still some degree of "timing" ie setting the timing chain up correctly, otherwise no degree of computer advance or retardation can fix it. but there should be marks on both the cam and the crank along with the engine block to line it up right

There is no need to set the timing on the 4.0l engine, sensors tell the computer where the crankshaft is, and the computer decides when to inject fuel, how much fuel to inject, when and how much spark to be at the optimum efficiancy. The days of being concerned with how to set the timing are history, the computer is able to adjust the timing as it runs, and make the adjustments per conditions at all times while it is running.

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15y ago
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Q: What is the timing to be set at for a 89 jeep 40?
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