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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > Technical Discussion and Customizing your H2

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Old 04-11-2012, 04:52 PM
markdoddridge markdoddridge is offline
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Default Faint rapping coming from the engine, kinda freaked out

I just pulled in to work about 20 minutes ago and as i was idling in the parking spot i noticed a faint rapping. More like a ticking actually. Ive never heard this before and its kinda freaking me out.

Is my H2 dying? shes an 04 and has 90k miles
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Old 04-11-2012, 06:10 PM
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tiny2012 tiny2012 is offline
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Default Re: Faint rapping coming from the engine, kinda freaked out

if its ticking i would check for broken exhaust manifold bolts,i just went thru this on my 05,had a broken bolt on both sides....usually on cold startup...
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Old 04-11-2012, 08:34 PM
markdoddridge markdoddridge is offline
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Default Re: Faint rapping coming from the engine, kinda freaked out

Quote:
Originally Posted by tiny2012
if its ticking i would check for broken exhaust manifold bolts,i just went thru this on my 05,had a broken bolt on both sides....usually on cold startup...

This sounds like a relatively easy fix, is it just a matter of replacing the bolts?
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Old 04-11-2012, 09:03 PM
Easy Ed Easy Ed is offline
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Default Re: Faint rapping coming from the engine, kinda freaked out

If it is the exhaust bolts, sometimes easy, sometimes not so easy......

http://www.elcovaforums.com/forums/s...ad.php?t=41269
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Old 04-11-2012, 10:54 PM
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Default Re: Faint rapping coming from the engine, kinda freaked out

Sounds easy Usually not so easy Be extra careful when taking the bolts out. Use penetrating spray well before even trying to take them out, otherwise you might brake one of (the stock ones are very weak). Good luck finding the problem, but it ticking is a symptom of a broken exhaust manifold or missing bolts. Usually though it is more apparent when the engine is cold, since when it heats up, the metal expands and usually seals small gaps.
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Old 04-11-2012, 11:01 PM
markdoddridge markdoddridge is offline
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Default Re: Faint rapping coming from the engine, kinda freaked out

Ok just went to lunch and the ticking is gone. Thanks for everything guys! At least i know i have a while to diagnose/fix the problem now
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Old 04-13-2012, 12:23 AM
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Default Re: Faint rapping coming from the engine, kinda freaked out

Also 6.0s have the cold start problems, Almost every 6.0 I hear about in the 2500's get the cold start up ticking, I'd suggest synthetic oil if you believe it to be that.
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Old 04-13-2012, 12:44 AM
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LoJac963 LoJac963 is offline
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Default Re: Faint rapping coming from the engine, kinda freaked out

I just hit 38k on my 06 and just heard this ticking the other day. My first thought was either idler or tensioner pully but it went away after a couple mins. I'm more familiar with the LS2 engine which is similiar and I know that engine never made sounds at startup. So as mentioned above it could just be our engines, exhaust mani, pully which I thought or something else.
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