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Original Message
Thoughts to Ponder
By John - 01/03/2002 5:49:53 PM; IP 142.177.52.40
Your engine really isn't backfiring, as that word describes combustion coming back up through the carb. What you are describing is fuel igniting in the exhaust system. So the problem is unburnt fuel entering the hot exhaust system and igniting by the sounds of things. This can happen from a variety of causes such as burnt valves, etc, but is mostly due to one of the following....fuel probelm in the carb (my second choice) or faulty ignition (my first choice). Faulty ignition is usually plugs or wires, sometimes cap or rotor (carbon tracking on bottom side of rotor, or inside cap are a sure sign). Points systems need to be in good shape with good plugs, cap, rotor, coil, etc....but I have found by far the most common probelm is bad HV wires. Easy to check for...start the car at night with the hood open and look for arcing, blue sparks, glow, etc.

I doubt the timing would be off that much, and if a vacumn line was off or broken, the engine would either idle very high or not at all.

If the ignition checks out OK, then try a carb kit. I doubt you have mechanical damage yet, but if you don't solve the problem...well...hmmm...Good Luck!
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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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