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Old 03-15-2014, 11:47 AM   #1
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Noise when cold...

I'm getting a noise when I start my tj in the morning. Sounds like something is hitting the radiator fan and it goes away when the engine is warn. It is also changes intensity with rpm .. At 2000 it stops, below it starts again. Anybody have this problem? I just stated to notice that in the past month but now it's getting louder.

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Old 03-15-2014, 12:14 PM   #2
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Would you say it's more of a tick or a knock?

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Old 03-15-2014, 12:38 PM   #3
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Tic
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Old 03-15-2014, 12:53 PM   #4
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Without hearing it, I would say a hydraulic lifter is on it's way out. How many miles are on your motor?
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Old 03-15-2014, 12:57 PM   #5
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Without hearing it, I would say a hydraulic lifter is on it's way out. How many miles are on your motor?
67k
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Old 03-15-2014, 12:58 PM   #6
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Without hearing it, I would say a hydraulic lifter is on it's way out. How many miles are on your motor?
I know that sounds like but it's more like external than internal.
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Old 03-15-2014, 01:10 PM   #7
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And everything in the engine compartment is square including the radiator and motor mounts?
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Old 03-15-2014, 01:32 PM   #8
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Yeah everything looks good! I'm thinking a pulley or water pump. It only does it when it's 100 cold/ several hours after shutdown. I've tested to see if it's only during start up but it's not ( I tested it 1 hour after shut down- noise)
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Old 03-15-2014, 01:46 PM   #9
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i get a tic on cold starts from time to time but from what i understand, thats just how the 4.0s are. i know everything is sound on my jeep and it only have 59,000 on it
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Old 03-15-2014, 03:40 PM   #10
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I know my jeep has its quirks too but this is something new, i dont want to chance something if i ignore it
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Old 03-15-2014, 03:55 PM   #11
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Now you didn't specify at what temp...I know when it's boneass cold here in New England.....it's my bones rattling when I go out in the morning to start up. No real answers. Maybe have someone else start it while you look under the hood to find the source? I am hoping for spring weather at some point.....what I really should be hoping for is temps above the freezing mark. An unusual 40F today, but that's shortlived as we head back to the 20's for highs next week. Good luck finding the alleged problem.
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Old 03-15-2014, 04:03 PM   #12
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Now you didn't specify at what temp...I know when it's boneass cold here in New England.....it's my bones rattling when I go out in the morning to start up. No real answers. Maybe have someone else start it while you look under the hood to find the source? I am hoping for spring weather at some point.....what I really should be hoping for is temps above the freezing mark. An unusual 40F today, but that's shortlived as we head back to the 20's for highs next week. Good luck finding the alleged problem.
Ok - sorry. I dont mean cold as in ambient, but cold engine. and we normally dont get colder than 40 or hotter than 95 here in oregon.
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Old 03-15-2014, 04:12 PM   #13
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My guess is an exhaust leak due to a cracked header...could be way off, though. They're usually a lot more noticeable when cold and then they tend to disappear or quiet way down when warm.
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Old 03-15-2014, 07:18 PM   #14
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I'm thinking a pulley or water pump.
Usually a bad pulley will sound similar to a belt squeak and a water pump will be a whine almost like a supercharger. If no one here can help ya definitively, I would post a video and go from there.
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Old 03-15-2014, 07:40 PM   #15
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With the engine off, grab the fan and try to wiggle it up and down and side to side. If it wobbles, might be a bad fan clutch or water pump bearing. I have several friends who have had 05 and 06 TJs and had the fan clutch fail around 60 to 70K. Just another thing to check.
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Old 03-15-2014, 07:52 PM   #16
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With the engine off, grab the fan and try to wiggle it up and down and side to side. If it wobbles, might be a bad fan clutch or water pump bearing. I have several friends who have had 05 and 06 TJs and had the fan clutch fail around 60 to 70K. Just another thing to check.
good call - I'll try that when I get home, plus I'll remove the belt and check the other pulleys.
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Old 03-15-2014, 07:53 PM   #17
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Usually a bad pulley will sound similar to a belt squeak and a water pump will be a whine almost like a supercharger. If no one here can help ya definitively, I would post a video and go from there.
I was thinking the same too... I'll def record it tomorrow morning so u guys can hear it too.
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Old 03-16-2014, 02:15 PM   #18
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No luck ... I got my camera all set up but The noise is gone. Hopefully for good!
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Old 03-16-2014, 02:35 PM   #19
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Has the neighbor's cat been seen lately? Was there fur under the jeep?
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Old 03-17-2014, 07:04 PM   #20
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Well - It did it this morning but I was running late so I had no time to play around with that.
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Old 03-17-2014, 09:31 PM   #21
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The more i think about it, might be a bearing going bad on the idler or tensioner pully. They are fairly cheap and easy to replace.
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Old 03-18-2014, 03:09 AM   #22
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I get this real loud tapping noise for a few seconds every now and again on cold starts to ,


this isn't a 05 06 oil drive pump thing problem right ?
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Old 03-18-2014, 11:41 AM   #23
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I get this real loud tapping noise for a few seconds every now and again on cold starts to , this isn't a 05 06 oil drive pump thing problem right ?
I hope not!!! What is this oil pump ticking you speak of?!?!
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Old 03-18-2014, 09:09 PM   #24
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I was told u will see ur oil gauge bounce back and forth when its ticking then u know its going out the oil pump drive thing , mine doesn't move its steady lil past half way , so I don't think my 04 has the (05-06) problem ?
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Old 03-19-2014, 10:00 AM   #25
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I was told u will see ur oil gauge bounce back and forth when its ticking then u know its going out the oil pump drive thing , mine doesn't move its steady lil past half way , so I don't think my 04 has the (05-06) problem ?
ok good- my oil press stays past half and goes up slightly when I speed up

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