Does anyone else have a 4.7 that when started cold ticks? - JeepForum.com
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Unread 12-04-2013, 11:17 PM   #1
jnsnams
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2001 WJ 
 
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Location: Blanchard, Oklahoma
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Does anyone else have a 4.7 that when started cold ticks?

Have had several wj 4.7 limiteds that when cold and stated tick/knock till warm? Is this normal? I have had them from 70k-150k and all 4 that I have had have done this...

My most recent is a 2001 and I noticed today it was doing the same thing, passenger side up front. Almost like it was a ac compressor doing it.

Any ideas? I run full synthetic Mobil oil. And lucus. If that makes a diff.

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Unread 12-04-2013, 11:21 PM   #2
FastSUV
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mine does...I have heard it is quite common with that motor?
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Unread 12-04-2013, 11:35 PM   #3
jnsnams
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Quote:
Originally Posted by FastSUV
mine does...I have heard it is quite common with that motor?
Same passenger side up front?
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Unread 12-05-2013, 01:18 AM   #4
MadderThanMax
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Check your exhaust manifold. It maybe cracked and as it heats up it expands thus the tick disappears...
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Unread 12-05-2013, 05:48 AM   #5
HiPERnx
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My WG does.
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Unread 12-05-2013, 06:15 AM   #6
xman2yman
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Mine does and my exhaust mani was already fixed a month ago. Has it ever turned into a major problem?
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Unread 12-05-2013, 06:43 AM   #7
ellenberger
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Mine probably does but I never notice cause my dd is an 03 Subaru wrx and those all tick, its the nature of the Subaru so I dont notice anymore. I'm sure its nothing serious.
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Unread 12-05-2013, 08:38 AM   #8
MadderThanMax
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It can lead to burnt valves and a reduction in performance but other than that...

Get a piece of Tissue paper and some long pliers and go round the manifold and check for leaks...the exhaust gas escaping will puff the paper and confirm it.
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Unread 12-05-2013, 08:51 AM   #9
04beachwheeler
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Mine does the same. I though it was the AC compressor as well. It hasn't worried me too much. I also thought it was coming from the injectors or intake manifold.
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Unread 12-05-2013, 10:32 AM   #10
Jeeples
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The wife's '03 has a ticking coming from the driver's side (presumably the exhaust manifold) that is more prominent in cold temps, interestingly enough I can hear it coming from the tailpipe as well. Her 4.7 has 133k on it currently.

My '00 is quiet as a cemetery with 167k on it, even with the belt driven fan it's sometimes difficult to hear that it's running.
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Unread 12-05-2013, 11:08 AM   #11
jnsnams
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Jeep led got the one good wj motor that came out...lol..yea its not the manifold, I stefascoped it. It's the front cycle dee doing something weird. And it's been like that on all the jeeps I have had.. Strange.
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Unread 12-10-2013, 08:50 PM   #12
jnsnams
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Anyone else have this issue? Trying to see how common this is for everyone.

Also what kind of modded upgrades are there for the 4.7?
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Unread 12-10-2013, 10:09 PM   #13
Prickett10
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178,000 on the odo now and its done it since 78,000 never been an issue.
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Unread 12-10-2013, 10:25 PM   #14
jnsnams
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Quote:
Originally Posted by Prickett10
178,000 on the odo now and its done it since 78,000 never been an issue.
Wow..ok.. Mine has 120k and seems it got a little worse but it's been colder here than normal too.
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Unread 12-11-2013, 01:20 AM   #15
Archermahly
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If I read correctly in one of the stickies…it's got something to do with the emissions system, and is perfectly normal.
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