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Old 02-28-2011, 08:01 AM
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knock sensor problem.....:(

So i though this would be a good time to take out my knock sensors and put in new ones. They say it only takes a few hours.

That wasn't the case for me. ( image 1)
It was more like where is the rear knock sensor, under all that rust and dirt.

After a few days, I got it out, thank God for that.

I cleaned the cavity, but found the walls were damaged, partly due to rust and partly me. ( see image 2).

Cant tell if the walls are punctured or OK.

Question - would there be a problem if I put in the new knock sensors, wires etc. if there is a a few small holes in the cavity of the valley cover?

I would really appreciate an answer form those who really know their stuff.

Thanks in advance.
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Old 02-28-2011, 10:25 PM
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let me put it a different way.

If there are a few small hole in the valley cover plate, would that be a problem?? ( click image )
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Old 02-28-2011, 11:48 PM
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Try this site more in to this type of thing www.fullsizechevy.com
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Old 03-01-2011, 10:46 AM
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Does anybody here know anything about what goes on under the the valley cover under the intake manifold??

Here is my guess work on this scenario.

1. The area under the valley cover is pressurized.
2. The area under the valley cover contains oil at high temps.
3. the possibility of small holes in the knock sensor cavity will cause oil to seep into the cavity flooding the knock sensor, and eventually run over the front and rear of the engine and transmission, onto the ground.
4. I will have to to go back in and do a big clean up job and repair.


How does that sound ??
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Old 03-03-2011, 04:21 AM
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The valley cover seals the crankcase. If there are holes in it, it should be either repaired or replaced.
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Old 03-03-2011, 04:43 AM
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thanks for that cobolt.

I heard the gasket can be reused, what do you think?
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Old 03-03-2011, 04:53 AM
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Yes, you can reuse it. Obviously it needs to be in good shape, but I wouldn't worry a bit about reusing it.
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Old 03-03-2011, 05:10 AM
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Thats good news!

Question once in there, is there anything else I should be also looking at ??
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Old 03-03-2011, 05:26 AM
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Quote:
Originally Posted by old yukon
Thats good news!

Question once in there, is there anything else I should be also looking at ??
Not really.

Some guys have said converting the LS1 PCV system to the LS4 system is a better way to go about it. This requires some grinding of the block under the valley cover to use the LS4 valley cover. The LS4 cover has an oil separation chamber that is used instead of the valve cover mounted LS1 PCV system. But if the engine's not using oil or having PCV-related problems, I would keep on using the set-up the way it is.
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Old 03-03-2011, 05:32 AM
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Sweet !

I dont need to go down that road.

leave it as is.
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