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post #1 of (permalink) Old 10-20-2003, 11:07 PM Thread Starter
 
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Decelerating exhaust popping

What are the causes of exhaust popping noises on deceleration (i.e. down hills)?
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post #2 of (permalink) Old 10-20-2003, 11:51 PM
 
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Re: Decelerating exhaust popping

I got the same thing. our rigs look similar. it is probably the poor excuse for an inductions system that AMC designed.

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post #3 of (permalink) Old 10-21-2003, 12:42 AM
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Re: Decelerating exhaust popping

Exhaust leak or vacuum leak at the caburator, just to name a few I've experienced.
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post #4 of (permalink) Old 10-21-2003, 10:33 AM Thread Starter
 
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Re: Decelerating exhaust popping

Could the cam have anything to do with this? I've got a 4.0 Head in the shop. If I need to do anything to the cam, I might as well do it all at the same time.
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post #5 of (permalink) Old 10-21-2003, 12:05 PM
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Re: Decelerating exhaust popping

I had the same thing happen to me twice...
1st time was on a ford van that had sliped a notch on the timing chain (it caused more problems than just that)
and
2nd time on a ford mustang when I advanced the timing too much trying to get more hp out of the engine.
Have you adjusted your timing recently? [img]images/graemlins/givemebeer.gif[/img]
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post #6 of (permalink) Old 10-21-2003, 12:46 PM
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Re: Decelerating exhaust popping

If it's backfiring it would be timing or the like. If you have some mild "pop, pop," kinda more like air or compression noises that would be normal especially noticeable if you have an aftermarket muffler. Every truck or Jeep I've owned has done this after I've installed high flow exhaust. THe factory type mufflers usaully muffle this all out.
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