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Old 10-20-2004, 09:53 AM
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Exhaust Leak

Ok I've had this leak down where my collector to my header and my exhaust meets. I put a new donut, new gasket and still it is wanting to backfire. Could i just be back-pressure or do i still have a leak?

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Old 10-20-2004, 09:59 AM
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Da. Your the only one that could tell us if you have a leak.
A leak will not cause a backfire.

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Old 10-20-2004, 10:02 AM
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Then could my timing be off and cause it to do that?
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Old 10-20-2004, 10:07 AM
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Yes, check the dwell first.

Troy
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Old 10-20-2004, 10:15 AM
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My timing is already at about 10. Rpm at about 700. What about adjusting my air and fuel ratio.

If timing and rpm isn't correct, what should it be. Engines a 77 chevy 350 edelbrock intake and carb and an rv cam?
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Old 10-20-2004, 10:25 AM
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Unburnt fuel in your pipes will ignite causing backfires.
?is it when you throttle off ??
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Old 10-20-2004, 10:29 AM
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No i only does it when I'm in park or neutral reeving it. When i'm in drive and i let off the gas there is little pops out the exhaust pipes.
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Old 10-20-2004, 10:36 AM
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Set the timing to where it runs the best. Adj. the AF to where it idles the best. and CHECK the dwell.

Troy
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Old 10-20-2004, 10:42 AM
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Quote:
Originally posted by Yub350
No i only does it when I'm in park or neutral reeving it. When i'm in drive and i let off the gas there is little pops out the exhaust pipes.
Ya probly got exaust leak iff ya spark timing and fuel mixtures are correct,, unless you haxe a bad wire somewhere,,..
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Old 10-20-2004, 10:48 AM
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I'm pretty sure my wires on the distributer are hooked up right. I got the order from summit. But if anyone else knows the correct order and is working for them i could check it and would be appreciated. Its a 77 350 and i just need to know were the Numbers are on the distributer.
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Old 10-20-2004, 11:16 AM
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Sounds like you need a shop manual. Any one who is going to work on there own car, and has no knowledge about it should get a book and study it.

Troy
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Old 10-20-2004, 11:18 AM
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Popping out the exhaust when you let off the gas is the most common effect (in my experience) of an exhaust leak. Check your collector gaskets again as well as manifold gaskets! Be sure they are sealed. Intake leaks pop upon acceleration and idle whereas most small exhaust leaks pop upon deceleration.
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Old 10-20-2004, 11:28 AM
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the guy on "Trucks" recently showed what it sounds like you need. It is a pair of clamps that fit the exhaust connection at yer collector. A clamp goes on each side of the connection and keeps it snug to prevent leaks and blowouts right there. Shouldnt take much to find the company that makes them.
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Old 10-20-2004, 12:16 PM
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If it's an old set of headers, they may be rotted out where the 4 pipes join the collector, beween the pipes.
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Old 10-20-2004, 01:02 PM
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every things brand new and i have the book on it, but some suggested that the plugs might be on there wrong. so if anyone has a pic of the fireing order i can see if mine matches.
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