98 TJ 4.0 timing - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 05-17-2001, 12:43 PM
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98 TJ 4.0 timing

Any body know the correct procedure for checking the timing on a 98 TJ with 4.0 and a 5-speed. Most every vehicle I have had, there was something you either had to disconnect or disable to check timing. Any help would be appreciated.

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post #2 of (permalink) Old 05-17-2001, 02:22 PM
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Re: 98 TJ 4.0 timing

I don't think you can check the timing, its all done by on board computer. That is if you installed the distributor correctly. Someone correct me if I'm wrong.

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post #3 of (permalink) Old 05-17-2001, 11:52 PM
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Re: 98 TJ 4.0 timing

nycjeep88 is correct. The timing is non adjustable. It is determined by the crank angle sensor in the bell-housing. The pick-up in the dist. is called the cam angle sensor, and is primarly used to control injector timing. Your 4.0l has sequential port fuel injection, as the injectors are timed relative to the intake stroke. There is a "high altitude" crank angle sensor that advances the timing 8 crankshaft degrees, which is 4 dist. degrees.

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post #4 of (permalink) Old 05-18-2001, 07:18 AM
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Re: 98 TJ 4.0 timing

I appreciate the replies. I don't have a problem, just did routine maint. and was stumped when I saw label underhood that said no adj. necessary. Once again, thanks.

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