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brianpam
User
Apr 26, 2010, 5:55 AM
Post #1 of 12
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catalytic converter
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can a badly plugged cat, blow an engine? bend a crank, or piston?
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nickwarner
Veteran
/ Moderator
Apr 26, 2010, 8:04 AM
Post #2 of 12
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Re: catalytic converter
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no, but it can make it so it doesn't have enough power to get out of its own way, sucks gas like crazy and misses like no other
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brianpam
User
Apr 26, 2010, 11:37 AM
Post #3 of 12
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Re: catalytic converter
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ok. thank u. well, I turned on my truck one day, and it went bang. something near the crank, and top end, knocks like a tractor. 97 1/2 ton silverado, with a 5.0. And I cant figure out what happened. my cat was so plugged that i assumed thats what did it. And yes my oil was good at the time. fluids never mixed at all. Any suggestions?
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nickwarner
Veteran
/ Moderator
Apr 26, 2010, 6:09 PM
Post #4 of 12
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Re: catalytic converter
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sounds like you might be looking at a new motor
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matchmatt
Novice
Apr 27, 2010, 4:36 PM
Post #5 of 12
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Re: catalytic converter
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Um it is a chev buddy...what do you expect? haha
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 27, 2010, 5:08 PM
Post #6 of 12
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Re: catalytic converter
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That was helpful info matchmatt - not.
Chev small block V8s can (heard of once) have starter work so hard to crank because of some other fault that they break a chunk of engine block off where starter mounts. Didn't see it myself but passed on thru another tech of such a wild happening,
T
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matchmatt
Novice
Apr 27, 2010, 7:23 PM
Post #7 of 12
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Re: catalytic converter
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lol, I'm just buggin'
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Sidom
Veteran
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Apr 27, 2010, 7:32 PM
Post #8 of 12
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Re: catalytic converter
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As Nick implied, it doesn't sound good. If it's knocking while running, that isn't a good sign.
Tough to diag online but a trained ear should be able to narrow it down fairly quickly......
Matchmatt...... While you may think its funny I'm sure brianpam doesn't share your sentiment......
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re-tired
Veteran
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Apr 27, 2010, 7:39 PM
Post #9 of 12
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Re: catalytic converter
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I have something similar Tom . I was present when a starter broke its nose piece. I've also seen flexplates shatter .
LIFE'S SHORT GO FISH
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brianpam
User
Apr 28, 2010, 5:56 AM
Post #10 of 12
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Re: catalytic converter
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thank u all 4 your help. its not the starter though.... i'm pretty familiar with my truck, except internally. the knock almost goes quiet after i get it up to speed and let off the accelerator. i know the engine needs to be pulled and repaired, im just not to familiar with the bottom end....
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 28, 2010, 6:50 AM
Post #11 of 12
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Re: catalytic converter
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Refresh: Sudden bang and subsequent loss of power but noise can diminish without load?
This seems like something plain broke rather that wear out. Even lack of oil pressure would have tell-tale symptoms and if all of a sudden no oil pressure wouldn't last long before engine just locked up.
Seems this was fine until that start up. That leads us to think of things that could happen even if rare right away on start up. The starter is stronger than most realize and it could break itself or anything involved with it seen or unseen.
Can only guess at this as we can't hear it. Hydraulic lock from a fluid getting in a cylinder would cause wild problems - either engine would turn and stop at that, or piston, rod snap, bend or something that would continue to make a noise.
Will take a professional ear and some diagnosis such as cancelling one cylinder at a time and other tests to see if this is a fatal problem for that engine or what??
T
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brianpam
User
Apr 28, 2010, 8:48 AM
Post #12 of 12
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Re: catalytic converter
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hours before it went bang, the oil gauge did flip flop a little. I kept an eye on it, but because i knew my fluid levels were right, i didnt think anymore about it...
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