Who has Factory Service Manuals for '80s 4.2L/258? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-17-2004, 09:02 PM Thread Starter
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Who has Factory Service Manuals for \'80s 4.2L/258?

I would like to see the spark/advance curves for the 258 engine. Is this info in the FSM? Anywhere on the web?

Thanks,
Tom
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post #2 of (permalink) Old 01-17-2004, 11:10 PM
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Re: Who has Factory Service Manuals for \'80s 4.2L/258?

1. Here's one from a '72 FSM



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post #3 of (permalink) Old 01-17-2004, 11:41 PM
 
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Re: Who has Factory Service Manuals for \'80s 4.2L/258?


[img]images/graemlins/goodpost.gif[/img]
Here is a set of curves from the 89 electrical FSM

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File Type: jpg 1248628-4_2L advance.jpg (50.0 KB, 1 views)
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post #4 of (permalink) Old 01-18-2004, 09:01 AM Thread Starter
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Re: Who has Factory Service Manuals for \'80s 4.2L/258?

Great graphs!!!

Thanks for the help. Why are there to plots on each graph?

Later,
Tom
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post #5 of (permalink) Old 01-18-2004, 12:13 PM
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Re: Who has Factory Service Manuals for \'80s 4.2L/258?

Tom- those 89 graphs match the graphs in my 82 FSM exactly. I read all through the text and can find no explanation for the 2 plots-although the specs are listed as +/- 2 degrees.
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post #6 of (permalink) Old 01-18-2004, 12:52 PM
 
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Re: Who has Factory Service Manuals for \'80s 4.2L/258?

just think of it as one fat line.

the area between the two lines is where the actuall curve should lie.

it is very common in engineering documentation.
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post #7 of (permalink) Old 01-18-2004, 01:02 PM Thread Starter
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Re: Who has Factory Service Manuals for \'80s 4.2L/258?

Thanks guys.

The +/-2 degrees explains the double plot.

Later,
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post #8 of (permalink) Old 01-19-2004, 01:52 PM
 
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Re: Who has Factory Service Manuals for \'80s 4.2L/258?

Tom,
It looks like you got what you were looking for.....but if you need/want the numbers from a '76 FSM I've got 'em. (no graph, just a chart). I Could type them up like I did in the thread for CJclay and the 304.
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