How does the comupter on 4.2 controll timing - JeepForum.com
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Unread 04-05-2002, 07:05 PM   #1
dcbeer
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Join Date: Mar 2002
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How does the comupter on 4.2 controll timing

just wondering how the computer on a 258 controlls the ignition timing...

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Unread 04-26-2002, 06:39 PM   #2
ade
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The 258 has vacuum advance timing so the engine Rpm decifers the advance
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Unread 04-26-2002, 06:47 PM   #3
johny1i
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That is a bit of a mystery subject, but one way is by the computer taking an input from the knock sensor mounted on the intake manifold. If the computer senses any pinging, it will retard the timing. There are probably other factors, also, but I haven't been able to find them.
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