by BigT5357 on March 2nd, 2007

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I have a 350 engine in my Chevy truck. Last time I drove it I was going about 70 mph down the highway and it started knocking real bad. I never lost any power, just knocks real loud. Could it be a bad oil pump?

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by Anonymous on March 2nd, 2007
It would take someone who knows such things better than I, actually listening to and examining your engine in person, to give you any kind of reliable diagnosis.

However, based on your description, my first guess would be that you have a “rod knock”. This means that one of the bearings that joins a connecting rod to the camshaft is beginning to fail. This kind of failure is very noisy, and you have noticed, but usually does not otherwise have a noticeable effect on performance — that is, until it fails completely; at which point your engine will be instantly converted into a very expensive piece of scrap metal.

There's no way of knowing how long your engine will last with this condition. You might be able to continue driving it like this for years; or it may self-destruct the very next time you try to start it.
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- And if/when it does, it will NOT be pretty, especially if you happen to be on the highway, at speed, and many miles from home.
  
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  by 8 Jan 2004-10 Dec 2009 on March 2nd, 2007
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by geek860 on March 2nd, 2007
Oil pump won't cause knock. It is a problem with the combustion. Try a higher octane gas. In addition, make sure that the distributer is in good shape the timing is correct.

Does it only happen above 70 or at all speeds?
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- It knocks even at a idle. If you were to drain most of the oil out of the engine and then start it, it knocks like that.
  
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  by BigT5357 on March 2nd, 2007
- Sorry I've never heard an engine running without oil. Can't help ya
  
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  by geek860 on March 2nd, 2007
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You're reading I have a 350 engine in my Chevy truck. Last time I drove it I was going about 70 mph down the highway and it started knocking real bad. I never lost any power, just knocks real loud. Could it be a bad oil pump?

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I have a 350 engine in my Chevy truck. Last time I drove it I was going about 70 mph down the highway and it started knocking real bad. I never lost any power, just knocks real loud. Could it be a bad oil pump?

Answers. 2 helpful answers below.

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I have a 350 engine in my Chevy truck. Last time I drove it I was going about 70 mph down the highway and it started knocking real bad. I never lost any power, just knocks real loud. Could it be a bad oil pump?

Answers. 2 helpful answers below.

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