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erratic popping snapping sound
#503632 October 11th 2011 8:18 pm
Joined: Jan 2011
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Erratic non-continuous popping / snapping type sound in the van. Mechanic took a look today and doesn't know what it is. Checked mufflers & nope, checked ujoints and they are good, is it the transmission?, or the teeth in the rearend? Keep in mind its not continuous and seems to happen under load when I am on the accelerator....???


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Re: erratic popping snapping sound
ianchevy #503660 October 11th 2011 9:11 pm
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Welcome! My experience with Chevy's is limited, I own Dodges now. It might be the cam shaft or even bad gas, just my 2%. Had the camshaft thing happen to one of my Chevy's,did the same thing.

Re: erratic popping snapping sound
ianchevy #503677 October 11th 2011 9:34 pm
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can you point where it's coming from at all. The front or rear? if it's the rear then may need axle work, possibly the brakes... but since under load I'm almost at a loss here, is there any sort of backfiring or misfiring? is it consistent or just random rattling? If it's random rattling I couldn't tell you other than it could be the catalytic converter is stuffed and needs replaced, if it's consistent with RPM's then it's something within the motor but under a load could be tranny. sorry I'm not much help but that my 1 cent.


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Re: erratic popping snapping sound
ianchevy #503680 October 11th 2011 9:36 pm
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Bubble wrap stuck under the gas pedal?


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The right to bear vans

65 ChevyVan Pontiac OHC 6/TH2004R
68 ChevyVan 108 454/4L80E
86 Dodge "Yeah, it's got a 318"
83 ChevyVan Shorty- B2%B Pt II
Re: erratic popping snapping sound
ianchevy #503683 October 11th 2011 9:48 pm
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Timing chain skipped a beat? Gets worse under load ?


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Re: erratic popping snapping sound
ianchevy #503684 October 11th 2011 9:50 pm
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The sound is for sure coming from the driveshaft area. Its not really really loud but loud enough to hear at 45 mph. Whats funny is its bad one day and the next not. But the other day on hwy it was really bad. So I know what ever the problem is that its getting worse. Its the type of sound that an experienced mechanic should be able to hear and know what exactly it is. I really hate for it to be the tranny. The ujoint sounds that I am hearing on youtube are not at all like the crackling popping I am hearing.


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Re: erratic popping snapping sound
ianchevy #503685 October 11th 2011 9:51 pm
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HMMM Doc thats the first someone has mentioned the timing chain. I'll make sure to check that.


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Re: erratic popping snapping sound
ianchevy #503690 October 11th 2011 10:12 pm
Joined: Feb 2006
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I did sometimes get a "metallic rustling" sound under a load in my Dodge. For me, the sound was attributed to a weak motor mount allowing the engine to torque twist enough for the headers to come into contact with the heat sheilding around the floor pan. There may be other het shields that are loose or coming into contact with movign items. Just another thought for whatever it's worth...
look for anything that may be loose, or see shiny metal anywhere that things may have been rubbing or bumping together...
Best of Luck...


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Re: erratic popping snapping sound
Natural_State #503729 October 12th 2011 12:08 am
Joined: Apr 2009
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Neighbors cat?????... lol


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