What is the proper timing at idle? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-05-2001, 08:11 PM
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What is the proper timing at idle?

I recantly tuned up my 4.2L, and it runs better than I barganed for.(even with the carter)
I was curious to see what the timing was at idle, it was at around 0-1* BTDC. I reved it and it advanced like normal.
On the return it went down to 1100RPM and 4* and abit later the timing kicked back down to around 0-1* and 650RPM.
Is this supposed to happen?
Does it hurt it to run at soo little advanced?
Any suggestion would be great, because I dont want to blow this motor at this time.

88 YJ 4.2L 2"body

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post #2 of (permalink) Old 01-05-2001, 08:43 PM
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Re: What is the proper timing at idle?

The timing should be between 9 and 11 degrees BTDC at 1600 RPM. I would stay between these, you will get backfiring /dieseling and alll kinds of wiered things happening if you are off too much.

89 YJ 258, lime green, 4" lift, no track bar, manual axle disconnect
post #3 of (permalink) Old 01-05-2001, 09:49 PM
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Re: What is the proper timing at idle?

I set the timing to within those specs.
and at 1600RPM it is always at those marks.
But I want to know how far down it should go at 650RPM, as I said, mine is at 1-2*. All I want to know is if that is safe?

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