4.7 engine bad sound - JeepForum.com
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post #1 of 7 Old 08-28-2013, 11:28 PM Thread Starter
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2000 WJ 
Join Date: Aug 2013
Location: Moscow
Posts: 2
Wj 4.7 engine bad sound

Hello everybody from Russia, Moscow!

I have 2000 WJ 4.7, and when i do cold start, the engine have a bad sound about 1-2 minute, when it hot, all is ok.

I change timing chain and tensioners, but sound stiil bad(
235k miles,Oil 10w30, pressure ok, fuel eco ok, no misings, jeep run good.


sound on my video.

sorry for bad English.

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post #2 of 7 Old 08-29-2013, 04:02 AM
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2000 WJ 
Join Date: Apr 2012
Location: orangville
Posts: 2,841
Welcome! And not to worry. Coherent, and punctuation. Can understand fine!

Now, I have the 4.0L, so others will better know the engine, but reminds me of my engine the way it sounded before things went really bad with it. Not to say, that that`s going to happen.

Can you pin point where the noise is coming from? Front or back? Top end? bottom end? etc. From what I've seen on here some noises are caused simply due to a broken manifold bolt and nothing else.

The beatings will continue until attitudes improve!

HID Quad bi-xenon + foglight retrofit
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post #3 of 7 Old 08-29-2013, 07:18 AM
Double E
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2000 WJ 
Join Date: Oct 2003
Location: Raleigh, NC
Posts: 5,225
I don't think that's the exhaust manifold leak. That manifold leak really sounds more like compression gasses escaping.

The sound clip sounds more like a top-end valve train or chain tensioner issue. Need light & location to better guess.

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
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post #4 of 7 Old 08-29-2013, 08:53 AM
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2001 WJ 
Join Date: Aug 2012
Location: South River
Posts: 218
My 4.7 sounds pretty much the same. I get good fuel economy and it runs very well aside from that sound on start up. It seemed to get worse after I switched to QS Defy. I have since run Penzoil 5W30 with Marvel Mystery oil in if for 1500 miles, then I went back to Mobil 1 synthetic... it still makes the same noise.

I found this thread on people chasing down that same noise:


I can't tell if it's my lash adjusters or possibly exhaust manifold leak. I had a ticking on start up, but now it's more of a clacking sound.... when I was out west I heard a Ford Explorer with a cracked manifold and it really makes a clacking sound like my 4.7...

It seems lots of these 4.7's make that sound and there is no straight forward answer on how to fix it.

2001 WJ V8 QuadraDrive Stock
1966 Ford Galaxie 500 LTD, 390 CI (6.4L) V8 4V, two door hard top, black on black
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post #5 of 7 Old 09-18-2013, 03:06 PM
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1999 WJ 
Join Date: Jul 2009
Location: sacramento
Posts: 21
Mine was a manifold leak. Very quiet after repair of driver side manifold.

99 and 05 JGC 4.7L
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post #6 of 7 Old 09-18-2013, 05:39 PM
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1995 ZJ 
Join Date: Sep 2013
Location: Wichita
Posts: 141
My Ram has had this problem forever, and my WJ does it too. Fact is, Chrysler V8's have traditionally made some lifter noise at startup, it's not something I sweat.

Do you have Marvel Mystery Oil in Russia? That seems to be best the thing to help treat it, but it won't fully "cure" it.

If you can, try that out. If you don't have Marvel Mystery Oil, I'll see if I can either find a comparable product that you can get, or we'll find a way to get you some. In exchange for some good vodka, of course.


1995 Jeep Grand Cherokee Laredo, 4.0L 2WD, 355,000 miles.
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post #7 of 7 Old 09-18-2013, 05:50 PM
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1995 ZJ 
Join Date: Sep 2013
Location: Wichita
Posts: 141
An excerpt from my 2000 WJ Factory Service Manual:


(1) Engine oil level too high or too low. This may
cause aerated oil to enter the adjusters and cause
them to be spongy.
(2) Insufficient running time after rebuilding cylinder
head. Low speed running up to 1 hour may be
(3) Turn engine off and let set for a few minutes
before restarting. Repeat this several times after
engine has reached normal operating temperature.
(4) Low oil pressure.
(5) The oil restrictor in cylinder head gasket or the
oil passage to the cylinder head is plugged with
(6) Air ingested into oil due to broken or cracked
oil pump pick up.
(7) Worn valve guides.
(8) Rocker arm ears contacting valve spring
(9) Rocker arm loose, adjuster stuck or at maximum
extension and still leaves lash in the system.
(10) Faulty lash adjuster.
a. Check lash adjusters for sponginess while
installed in cylinder head and cam on camshaft at
base circle. Depress part of rocker arm over adjuster.
Normal adjusters should feel very firm. Spongy
adjusters can be bottomed out easily.
b. Remove suspected lash adjusters, and replace.
c. Before installation, make sure adjusters are at
least partially full of oil. This can be verified by little
or no plunger travel when lash adjuster is depressed.

Perhaps that can help you along.


1995 Jeep Grand Cherokee Laredo, 4.0L 2WD, 355,000 miles.
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