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Original Message
RE: Now it gets complicated.
By Gerry Proctor - 06/03/2004 12:30:50 PM; IP 207.133.188.254
I'm assuming you have a scanner capable of reading the datastream. Look at the relationships of the calculated load/coolant temp sensor/rpm/O2v. Unless you're using an alpha-N, the system wants to get to closed loop as quickly as possible. Higher advance increases cylinder pressure which increases exhust heat which gets the O2 sensor and converter up to temp faster. There is also engine stability involved since a rich mixture is harder to fire and burn completely (or as completely as possible), makes the engine rough and sets misfire codes. It takes longer for the rich mixture to burn and hydrocarbons have a nasty habit of clinging to cold cylinder walls and will leave unburned if the advance isn't bumped up.

Take it for what it's worth but from the driver's seat, a significant idle advance at startup makes the vehicle easier to drive while it's warming up.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=21694&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21694" onclick="return false;">More questions on timing...not answered below</a>&nbsp;-- <font color=#0000ff>Walker, <i>06/02/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21694', contentMargin: 60, icon: $('anchor21694') }); </script>  More questions on timing...not answered below -- Walker, 06/02/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21698&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21698" onclick="return false;">RE: More questions on timing...not answered below</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21698', contentMargin: 60, icon: $('anchor21698') }); </script>  RE: More questions on timing...not answered below -- Gerry Proctor, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21700&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21700" onclick="return false;">Why: it's DIS, so 'vacuum advance' is now MAP adv</a>&nbsp;-- <font color=#0000ff>Walker, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21700', contentMargin: 60, icon: $('anchor21700') }); </script>  Why: it's DIS, so 'vacuum advance' is now MAP adv -- Walker, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21701&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21701" onclick="return false;">RE: Why: it's DIS, so 'vacuum advance' is now MAP adv</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21701', contentMargin: 60, icon: $('anchor21701') }); </script>  RE: Why: it's DIS, so 'vacuum advance' is now MAP adv -- Gerry Proctor, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21702&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21702" onclick="return false;">But at STARTUP? need some explanation/theory</a>&nbsp;-- <font color=#0000ff>Walker, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21702', contentMargin: 60, icon: $('anchor21702') }); </script>  But at STARTUP? need some explanation/theory -- Walker, 06/03/2004
Collapse <b>RE: Now it gets complicated.</b>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>06/03/2004</i></font>RE: Now it gets complicated. -- Gerry Proctor, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21704&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21704" onclick="return false;">I thought RETARDING the timing raised temp's</a>&nbsp;-- <font color=#0000ff>Walker, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21704', contentMargin: 60, icon: $('anchor21704') }); </script>  I thought RETARDING the timing raised temp's -- Walker, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21705&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21705" onclick="return false;">RE: We're working many different things.</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21705', contentMargin: 60, icon: $('anchor21705') }); </script>  RE: We're working many different things. -- Gerry Proctor, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21706&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21706" onclick="return false;">Still looking for theory on advance timing.</a>&nbsp;-- <font color=#0000ff>Walker, <i>06/03/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21706', contentMargin: 60, icon: $('anchor21706') }); </script>  Still looking for theory on advance timing. -- Walker, 06/03/2004
Collapse <a href=../ForumFE/reply.aspx?ID=21712&Reply=21694><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor21712" onclick="return false;">RE: Still looking for theory on advance timing.</a>&nbsp;-- <font color=#0000ff>Gerry Proctor, <i>06/04/2004</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=21712', contentMargin: 60, icon: $('anchor21712') }); </script>  RE: Still looking for theory on advance timing. -- Gerry Proctor, 06/04/2004
 I was surprising myself every new cold day... -- Walker, 06/04/2004
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