cold start engine clicking - JeepForum.com

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post #1 of 24 Old 01-19-2011, 07:30 AM Thread Starter
islandwheeler
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Wj cold start engine clicking

I have a 2000 WJ 4.7, and I've been noticing lately that whenever I start it up, especially when cold, the engine makes a clicking sound until it has reached operating temperature. I've popped the hood to see if I could figure anything out and I thought it was something on either the fan or belt assembly. Any ideas? Does this happen to anyone else?


2000 WJ 4.7L - 4.5" 32" KM2
2000 TJ 4.0 5spd
2001 XJ 4.0 79k
2012 WK2 Altitude Hemi
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post #2 of 24 Old 01-19-2011, 09:07 AM
65Mustangs
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Does it have a mechanical fan? It could be the fan clutch rattling. With the engine off, see if you can spin/rattle the fan by hand (as if it's loose).

The other thing would be oil. Are you using the right viscosity (especially for your climate), and is it new or old? Some high mileage engines will begin to "rattle" or "click" when the engine oil is due to be replaced (this is due to worn out parts in the engine itself). This also depends on your local climate. There is a big difference when it's -20* below outside, vs. 40* and raining.
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post #3 of 24 Old 01-19-2011, 10:39 AM
miked5
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Mine does a slight ticking that I assumed was injector related. It starts ticking and slowly goes into an eight tick cycle with pauses in between the 8 tick cycles.
Never really thought to much about it but now I'm wondering.
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post #4 of 24 Old 01-19-2011, 10:44 AM
MONSooNmonkey
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Lifters click when cold and worn out.
Wrist pins\piston rings will 'tah tah tah tah tah tah tah' when cold and worn out
Bearings will 'tik tik tik tik tik tik tik' when cold and warn out
Bearings are associated with running hot.

What kind of sound is it? (sounds stupid but every engine issue makes a different sound)

Sadface :(
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post #5 of 24 Old 01-19-2011, 10:47 AM
65Mustangs
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I just had another thought, but sometimes an exhaust leak will sound like a tic or click. You can check your manifolds and collectors / flanges to see if all the bolts are tight. Might also stick your head under the car while it's making the noise.
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post #6 of 24 Old 01-19-2011, 10:50 AM
SplitNail
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Exhaust manifold gasket/broken studds?

1999 WJ 4.7L V8, 242 TC, Front Aussie Locker, 4 Inch RC X-Series lift, 17x8 w/ 4.5BS Black Rock Vipers, 285/70/R17 BFG KM2's, All AMSOIL Synthetic Fluids

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post #7 of 24 Old 01-19-2011, 11:46 AM
88yjproject
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I'm going with the broken exhaust manifolds bolts also. Common on 4.7 and 5.7 engines.

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post #8 of 24 Old 01-19-2011, 01:34 PM
86cj74.2L
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post #9 of 24 Old 01-19-2011, 02:01 PM
MONSooNmonkey
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Quote:
Originally Posted by 88yjproject View Post
I'm going with the broken exhaust manifolds bolts also. Common on 4.7 and 5.7 engines.
Would it go away when it warms up?

Sadface :(
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post #10 of 24 Old 01-19-2011, 02:14 PM
narnwv
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Quote:
Originally Posted by MONSooNmonkey View Post
Would it go away when it warms up?
as it heats, metal expands, so yes it would go away when warmed up (the manifold can reach 800+ degrees)
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post #11 of 24 Old 01-19-2011, 02:14 PM
CoolGuyDave
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Quote:
Originally Posted by MONSooNmonkey View Post
Would it go away when it warms up?
yes it is possible.... as your header/headers warm up, the metal expands and closes the gap.

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post #12 of 24 Old 01-19-2011, 02:16 PM
MONSooNmonkey
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Quote:
Originally Posted by CoolGuyDave View Post
yes it is possible.... as your header/headers warm up, the metal expands and closes the gap.
Fair enough but he would be able to smell exhaust as well as his o2 sensor should throw an error from the leak.

Sadface :(
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post #13 of 24 Old 01-19-2011, 02:22 PM
86cj74.2L
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read the post I linked to and look for the item circled in the picture. Put your hand on it when you hear the ticking and you will feel it clicking in time with the noise.

Mine does it too and the purge solenoid is the elusive ticking noise on mine....errr...my wife's. (I only get to drive it when it breaks, can't get her out of it)
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post #14 of 24 Old 01-19-2011, 02:23 PM
CoolGuyDave
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Quote:
Originally Posted by MONSooNmonkey View Post
Fair enough but he would be able to smell exhaust as well as his o2 sensor should throw an error from the leak.
not always... my roommates car has a cracked header..... it leaks when its cold, but seals when its up to temp. no CEL and you cant smell it unless your head is under the hood.

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post #15 of 24 Old 01-19-2011, 02:53 PM
kadetklapp
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The noise going away when it warms up is a GOOD SIGN for you. That usually means it's just a leaky exhaust manifold. In my case, my 2004 WJ with 113k on it has this noise all the time and it's more "metallic" for the lack of a better term. Pretty sure I have a bearing about to fail.

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