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Original Message
Check the compression.
By Dave Shoe - 01/02/2002 11:22:41 PM; IP 216.243.159.36
You may also want to check the compression to determine whether a head gasket has started leaking into a neighboring cylinder, and to also be sure your valves are in good shape.

When compression checks out OK, I'd revisit the plug wires and distributor cap. Look under the hood when it's very dark (at night - not in a garage) and idle the motor. If you are backfiring severely under load you should be able to see blue glowing or arcing at the cap or plug wires someplace, even at idle. If you see nothing, then have someone put it in gear and load the motor, while you stand off to the side looking under the hood. The heavier mixture will almost certainly cause a light show if the problem isnt on the inside of the distributor cap.

I mainly suspect it's high-voltage, but secondarily believe it may be a blown head gasket.

Shoe.
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=10381&Reply=10381><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10381" onclick="return false;">backfiring 428 cj</a>&nbsp;-- <font color=#0000ff>Greg, <i>01/02/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10381', contentMargin: 60, icon: $('anchor10381') }); </script>  backfiring 428 cj -- Greg, 01/02/2002
Collapse <a href=../ForumFE/reply.aspx?ID=10383&Reply=10381><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10383" onclick="return false;">RE: backfiring 428 cj</a>&nbsp;-- <font color=#0000ff>Tim B, <i>01/02/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10383', contentMargin: 60, icon: $('anchor10383') }); </script>  RE: backfiring 428 cj -- Tim B, 01/02/2002
Collapse <a href=../ForumFE/reply.aspx?ID=10384&Reply=10381><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10384" onclick="return false;">RE: backfiring 428 cj</a>&nbsp;-- <font color=#0000ff>Greg, <i>01/02/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10384', contentMargin: 60, icon: $('anchor10384') }); </script>  RE: backfiring 428 cj -- Greg, 01/02/2002
 RE: backfiring 428 cj -- Davy Gurley, 01/02/2002
Check the compression. -- Dave Shoe, 01/02/2002
Collapse <a href=../ForumFE/reply.aspx?ID=10390&Reply=10381><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10390" onclick="return false;">RE: backfiring 428 cj</a>&nbsp;-- <font color=#0000ff>Ross, <i>01/03/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10390', contentMargin: 60, icon: $('anchor10390') }); </script>  RE: backfiring 428 cj -- Ross, 01/03/2002
 Check for sticking advance plate too... -- Bill Conley, 01/03/2002
Collapse <a href=../ForumFE/reply.aspx?ID=10394&Reply=10381><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10394" onclick="return false;"> another update.....</a>&nbsp;-- <font color=#0000ff>Greg, <i>01/03/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10394', contentMargin: 60, icon: $('anchor10394') }); </script>   another update..... -- Greg, 01/03/2002
 Thoughts to Ponder -- John, 01/03/2002
Collapse <a href=../ForumFE/reply.aspx?ID=10400&Reply=10381><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10400" onclick="return false;">Compression test results</a>&nbsp;-- <font color=#0000ff>Greg, <i>01/03/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10400', contentMargin: 60, icon: $('anchor10400') }); </script>  Compression test results -- Greg, 01/03/2002
Collapse <a href=../ForumFE/reply.aspx?ID=10406&Reply=10381><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor10406" onclick="return false;">RE: Compression test results</a>&nbsp;-- <font color=#0000ff>John, <i>01/03/2002</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=10406', contentMargin: 60, icon: $('anchor10406') }); </script>  RE: Compression test results -- John, 01/03/2002
 RE: Compression test results -- salid, 01/05/2002
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