4.7 Clackity-clack noise on acceleration - JeepForum.com

 
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post #1 of 5 Old 10-20-2015, 11:19 AM Thread Starter
distantdog
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4.7 Clackity-clack noise on acceleration

Over the past few months, I've noticed that, usually at hiway speeds, when I accelerate, I can hear a "clackity-clackity" noise coming from the engine. Sorry, thats the best way I can describe it.

I THINK its the engine, but its hard to be sure. Seems central behind the dash.

I mostly notice it under load (going uphill) at higher speeds.

FWIW - Early this year I had a head gasket replacement job done by a shop. Heads were resurfaced as well.


2004 WJ Laredo Special Edition V8 4x4

SOLD: 2001 TJ Sport
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post #2 of 5 Old 10-20-2015, 11:25 AM
WJCO
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The conditions under which it happens based on your description, leads me to believe it is pinging. But, I wouldn't describe that as 'clickity-clack.' If it is pinging, try some higher octane gas to see if it goes away or run a decarb through the intake. BG 44k is a good chemical to run in your tank from time to time.

If pinging isn't your issue, post a video of the noise you're hearing if you are able to.

Zone 4,33s,Herculined,roofrack,Zeon 8s,grill guard,washer relocated,DIY tire carrier,sliders.
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post #3 of 5 Old 10-20-2015, 12:25 PM
Double E
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Also sounds somewhat like the driver's side exhaust manifold bolts snapped.

Get under the hood when cold, engine running. Tug on the throttle cable under the airbox to rev the engine a little and if you hear it from the driver's side, by the heat shield, Bob's your uncle.

Common issue and plenty of threads on the topic.

2000 Laredo 4.7L Selec-Trac. 177K miles, Leather, 245 tires, tow package, crappy CD changer, full size spare, roof cross-rails & sunroof.
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post #4 of 5 Old 10-28-2015, 08:05 AM Thread Starter
distantdog
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Ran a tank full of high octane and a bottle of fuel system cleaner and the noise is gone.

Haven't looked at the manifold, but since the noise is gone, I am hoping its ok.

2004 WJ Laredo Special Edition V8 4x4

SOLD: 2001 TJ Sport
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post #5 of 5 Old 10-28-2015, 09:06 AM
WJCO
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Sweet. Glad to hear. Hope it stays that way.

Zone 4,33s,Herculined,roofrack,Zeon 8s,grill guard,washer relocated,DIY tire carrier,sliders.
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