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#503632 - October 11th 2011 8:18 pm erratic popping snapping sound
ianchevy Offline
newbie

Registered: January 24th 2011 12:44 am
Posts: 40
Loc: Southern California
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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#503660 - October 11th 2011 9:11 pm Re: erratic popping snapping sound [Re: ianchevy]
loosweel Offline
enthusiast

Registered: February 27th 2004 12:00 pm
Posts: 208
Loc: Queensbury, NY
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.

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#503677 - October 11th 2011 9:34 pm Re: erratic popping snapping sound [Re: ianchevy]
aftoyboy Offline
old hand

Registered: July 20th 2011 1:07 pm
Posts: 969
Loc: Las Vegas, NV, US of A
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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#503680 - October 11th 2011 9:36 pm Re: erratic popping snapping sound [Re: ianchevy]
Vanner68 Offline
pooh-bah

Registered: December 23rd 2000 12:00 pm
Posts: 3676
Loc: Eastpointe, MI ,yewessay
Bubble wrap stuck under the gas pedal?
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#503683 - October 11th 2011 9:48 pm Re: erratic popping snapping sound [Re: ianchevy]
Doc 2% of Canada, EH!!!! Offline
Vanner

Registered: June 10th 2003 12:00 pm
Posts: 12712
Loc: Burlington, On, Canada Eh !!!!
Timing chain skipped a beat? Gets worse under load ?
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#503684 - October 11th 2011 9:50 pm Re: erratic popping snapping sound [Re: ianchevy]
ianchevy Offline
newbie

Registered: January 24th 2011 12:44 am
Posts: 40
Loc: Southern California
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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#503685 - October 11th 2011 9:51 pm Re: erratic popping snapping sound [Re: ianchevy]
ianchevy Offline
newbie

Registered: January 24th 2011 12:44 am
Posts: 40
Loc: Southern California
HMMM Doc thats the first someone has mentioned the timing chain. I'll make sure to check that.
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#503690 - October 11th 2011 10:12 pm Re: erratic popping snapping sound [Re: ianchevy]
Natural_State Offline
old hand

Registered: February 06th 2006 12:00 pm
Posts: 1148
Loc: Fort Wayne, IN
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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#503729 - October 12th 2011 12:08 am Re: erratic popping snapping sound [Re: Natural_State]
LostSheep Offline
pooh-bah

Registered: April 13th 2009 6:36 pm
Posts: 3464
Loc: Dixie, USA
Neighbors cat?????... lol
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#503906 - October 12th 2011 5:25 pm Re: erratic popping snapping sound [Re: ianchevy]
ianchevy Offline
newbie

Registered: January 24th 2011 12:44 am
Posts: 40
Loc: Southern California
IT WAS THE REAR UJOINT!!! hanks guys for all the help. Running smooth now.
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