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Unread 04-04-2015, 07:53 PM   #1
itz_fred
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2006 Jeep GC WK 3.7l engine noise

Hi everyone,

I have a stranged noise coming from my 3.7l. It really sound like a slapping/talling noise comming from the bottom of the engine. It is worst on cold start and a bit less with the engine is warm, but the noise never goes away. Also, the sound follows the RPM, i can hear it from 800 rpm to about 2500 rpm. After that, the engine is to lound to hear it.

Does anyone have any clue? I figured piston slap at first but the noise doesn't go away when warm. What else could make a possible sound? Oil as just been changed and was perfectly good. The engine runs really smooth..

Thanks!

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Unread 04-04-2015, 08:26 PM   #2
JRLT
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Make sure somebody didnt put a ziptie on your driveshaft.
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Unread 04-05-2015, 06:27 AM   #3
Nejeep
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You might pull off the drive belt and see if the noise is still there, just to rule out the accessories or belt. Might possibly be an exhaust leak, they usually change noticeably as the exhaust warms up and the load changes. Maybe something weird like a cracked flex plate??
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Unread 04-05-2015, 11:32 AM   #4
itz_fred
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Thaks for the replies!
A ziptie on my driveshaft?
The noise really sound like metal on metal. I doubt that it's a cracked flex plate because it really constant with the engine, not like a vibration that occur sometimes. I will try to remove the belt and update the tread!
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Unread 04-05-2015, 12:13 PM   #5
itz_fred
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Update! I remove the belt but the noise is still there, but just little bit less loud.

Here is a video (my camera cancel all the noise so it's easy to hear it).

http://www.youtube.com/watch?v=2kye...ature=youtu.be
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Unread 04-06-2015, 07:24 AM   #6
Nejeep
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Based on the video, it sounds like the noise is louder near the back of the engine. If so, a loose or damaged transmission flex plate could still be a possibility as it is bolted directly to the crankshaft. Some older Jeep engines would have this problem, but not so common on the WKs.
Otherwise it could be something internal like a damaged piston or a bearing. An engine teardown would be the best way to find out.

How many miles on your engine, any recent work on the engine or transmission?
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Unread 04-08-2015, 05:30 AM   #7
itz_fred
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Thanks for the reply.. the jeep has 94000 miles and the only work done recently was a new oil pan (done by a stupid garage where i bought the truck). I remember now that the "mechanic" told me he had to move the engine to take the oil pan off... maybe he destroy the flex plate.. is it as easy as on the XJ to check for loose bolts and cracks on this WK?
thanks
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Unread 04-08-2015, 05:36 AM   #8
itz_fred
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oh and by the way... the noise is louder when i'm driving the vehicule (like on drive) than when I'm on park. Seem like when the engine is not under load the noise is less loud.

Last edited by itz_fred; 04-08-2015 at 05:37 AM..
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Unread 04-08-2015, 08:11 AM   #9
yzjwk
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Quote:
Originally Posted by itz_fred View Post
Update! I remove the belt but the noise is still there, but just little bit less loud.

Here is a video (my camera cancel all the noise so it's easy to hear it).

http://www.youtube.com/watch?v=2kyeD...ature=youtu.be
I've heard that noise a couple times before .
Sounds to me like your bottom end is done. Google "rod knock"
That's squeaking noise you hear on top of the knocking is generally from a Spun crank bearing.
You might need to start looking at replacement engines.
Good luck
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Unread 04-08-2015, 04:07 PM   #10
Nejeep
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I tend to agree it sounds more like a bad rod bearing to me and they do sound worse under load. If you keep driving it, I expect you will soon find out but you may be left stranded on side of the road.

Why was the pan replaced, because of an oil leak? If the engine was run without oil, that would be a likely outcome.
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Unread 04-08-2015, 04:18 PM   #11
itz_fred
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I live in canada so with the snow and salt 6 month per year, it was all rusted. I talked to the previous owner and he said oil change where always made acording the service manual ( and hes not the one who sold it to me) so its a reliable source. If i try the pull all the sparks plug, the sound should be far less loud if it a rod right?
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Unread 04-08-2015, 07:10 PM   #12
itz_fred
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So i tried to unplug all 6 sparks plugs one at a time. i did not removed the boot only unpluged the connector is that ok? i did not noticed any change in the knocking sound.
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Unread 04-08-2015, 08:14 PM   #13
yzjwk
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I wouldn't think you would notice a change really as long as the engine is still spinning. The piston and rod without the spark plug doesn't stop moving. The only way I know of checking is to remove the oil pan and physically grab your rod knuckles and see if they move. You could try a vehicle stethoscope and poke around the block and see if you can pinpoint where the noise is coming from.
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Unread 04-09-2015, 12:44 AM   #14
joe989
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if you just bought this jeep go get your money back immediately, you have 30 days to do it unless you sign a paper saying "purchased as is"
the engine is very likely destroyed and has been run without oil in it.
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Unread 04-09-2015, 06:31 AM   #15
itz_fred
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i've had the jeep for 3 months now
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