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muffler blow out

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Nov 22, 2009, 2:01 PM

Post #1 of 3 (2923 views)
muffler blow out Sign In

what would cause my muffler on my 94 s10 to blow out? also the truck bucked with bouncing rpms for about two weeks then today, pop!


Nov 23, 2009, 6:56 PM

Post #2 of 3 (2910 views)
Re: muffler blow out Sign In

Could possibly be a timing belt issue. If timing jumped, that would give the bucking and the radical RPM changes. Could have fired out of time and blew the muffler off. We used to do something like that with cars of the 50's or so. Get them going pretty good, then turn the key off and let it coast down- turn key back on and a big loud bang would result.

Hammer Time
Ultimate Carjunky / Moderator
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Nov 23, 2009, 7:19 PM

Post #3 of 3 (2907 views)
Re: muffler blow out Sign In

It's a timing issue but not due to timing belt. It's ignition timing duing that not valve timing. Since you see the RPMs bouncing. I would be highly suspect of the Crank sensor or the ignition module, mostly the crank sensor.


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