Does anyone else have a 4.7 that when started cold ticks? - JeepForum.com

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post #1 of 50 Old 12-04-2013, 10:17 PM Thread Starter
jnsnams
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2001 WJ 
 
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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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post #2 of 50 Old 12-04-2013, 10:21 PM
FastSUV
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mine does...I have heard it is quite common with that motor?

ZJ - 5.9 Limited
WJ - '04 4.7 Laredo
WJ - '04 4.7 H.O. Freedom
WJ - '04 Overland
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post #3 of 50 Old 12-04-2013, 10:35 PM Thread Starter
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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post #4 of 50 Old 12-05-2013, 12:18 AM
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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post #5 of 50 Old 12-05-2013, 04:48 AM
HiPERnx
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My WG does.

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Jeep WG -99 v8, see ^ for full info
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post #6 of 50 Old 12-05-2013, 05:15 AM
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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post #7 of 50 Old 12-05-2013, 05:43 AM
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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post #8 of 50 Old 12-05-2013, 07:38 AM
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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post #9 of 50 Old 12-05-2013, 07:51 AM
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.

04 WJ: 4.5' Clayton F, 4" IRO R, IRO adj front control arms, Ruffstuff OTK one ton tie rod, OBA.
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post #10 of 50 Old 12-05-2013, 09:32 AM
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.

His: '00 WJ 4.7 Limited- Some stuff

Hers: '03 WJ 4.7 Laredo- Some more stuff

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Quote:
Originally Posted by wjjeep19 View Post
It is what Jeeples has *PARTIALLY* stated.
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post #11 of 50 Old 12-05-2013, 10:08 AM Thread Starter
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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post #12 of 50 Old 12-10-2013, 07:50 PM Thread Starter
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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post #13 of 50 Old 12-10-2013, 09:09 PM
Prickett10
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178,000 on the odo now and its done it since 78,000 never been an issue.

2002 TJ I6 5speed
JK wheels, 32"BFG T/A's, JK headlight conversion

Better to be mute than dispute with the ignorant.
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post #14 of 50 Old 12-10-2013, 09:25 PM Thread Starter
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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post #15 of 50 Old 12-11-2013, 12:20 AM
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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