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Old 08-08-2010, 06:58 PM
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Engine Knocking because of wrong knock sensors?

Hey guys,

So just when i thought i could finally get on the road, tragedy strikes in the form of engine knock.

My fans weren't kicking on due to a dead PCM output module. I swapped in my 94 Caprice PCM (in place of my 96 impala PCM) and the fans kicked on. I decided to drive to my local radio shack and pick up the resistors to do the PCM mod, which was about 10 miles away. I pick up the resistors and drive home. I pull into my driveway, and to my horror the engine is clattering away.

Is it possible i toasted my engine? What can be done? it definitely is clattering -- how badly, i don't really have a scale to compare. what should I do? if i have ruined the engine, how tough is the job to get it back in order?

any help?

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Old 08-08-2010, 07:04 PM
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Need more info. Did it overheat, did you run it dry of oil? Where is the sound coming from, bottom, top, rockers? Is it a knocking or clattering or ticking? What kind of engine in what car?
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Old 08-08-2010, 07:18 PM
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Oops:

It is a 1996 Impala SS LT1, stock. It currently is residing in a 1984 Jaguar XJ6. It sounds like a clatter-y sound, which goes in and out, but the longer the engine is on, the more prominent the sound. Engine didn't overheat, and the oil is new, freshly changed about a month ago. I'm not exactly sure where the knocking sound is coming from -- it is loud under the hood and hard to tell. I'd say the bottom front if I had to say it was anywhere.
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Old 08-08-2010, 08:10 PM
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Pull off the valve covers and check valve lash. Could be as simple as that. Was the engine recently rebuilt? Maybe you could put a video on youtube or something so we can hear the sound?
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Old 08-08-2010, 08:36 PM
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link to video

here's the link to the video -- the sound actually is getting worse now.. ugh!

http://www.youtube.com/watch?v=H_asyb6r7oE

cant really tell where the sound is coming from -- not sure if i could do the job myself -- i did the swap, but never had to do any internal engine work.

what do you think?


about a month ago it started making a high pitched "squeak" sound when the engine would rev -- i thought it was a pulley, but after watching a few videos on youtube, it sounds like the squeak could be related to the engine spinning a bearing... which would cause the engine knock, right? if that is the case, what is the job looking like?
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Old 08-08-2010, 08:40 PM
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AHHHHHHHHH! That sounds really bad man. How loud is it? Sounds like rod knock on the video.
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Old 08-08-2010, 09:01 PM
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its definitely gotten louder -- its a clacking sound. you can sorta hear it when you're in the cab -- definitely can hear it when you're standing in front of the car.

does a spun bearing produce that squealing sound that i'm hearing? What should i do next? rebuild kit?
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Old 08-08-2010, 09:06 PM
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It's difficult to tell exactly what the sound is because i can't hear it in person so i would suggest having a mechanic in your area come check it out. It really isn't hard to rebuild an engine and sometimes you can do it with the engine still in the car. But definitely have someone come check it out in person before you do anything. Good luck.
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