Noise
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Noise - 10/6/2007 8:12:25 AM
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ZR2003
Posts: 9
Joined: 10/5/2007
Status: offline
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I have a rattle-type noise occuring in my engine compartment at 1400-2200 RPM. It only occurs when the trans is in gear and the motor is warm. It does not seem to be coming from the exhaust.
One mechanic dismissed it as noisy lifters, but don't these typically make more noise in a cold engine and quiet down as it warms up?
I see there is a TSB pertaining to the timing chain tensioner making a noise like this. Has anyone experienced this problem? And does it make sense that it would only do this after warming up?
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RE: Noise - 10/6/2007 11:18:18 AM
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swartlkk
Posts: 14308
Joined: 5/1/2005
From: Waterloo, NY
Status: offline
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There actually is a TSB on this very thing. Most likely it is the balance shaft making the noise. There is a quite extensive repair procedure that can be done, but... Let me read through it and see how long the TSB is. I may be able to post the whole thing.
_____________________________
Kyle-
2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto
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RE: Noise - 10/6/2007 12:54:00 PM
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ZR2003
Posts: 9
Joined: 10/5/2007
Status: offline
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Thanks. Any help would be greatly appreciated.
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RE: Noise - 10/6/2007 1:46:02 PM
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swartlkk
Posts: 14308
Joined: 5/1/2005
From: Waterloo, NY
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Here's the beginning of the TSB for this repair:
quote:
Engine - Engine Rattle at 1,800-2,200 RPM's
Bulletin No.: 03-06-01-024C
Date: August 30, 2006
TECHNICAL Subject: Rattle Noise In Engine (Install Timing Tensioner Kit)
Models:
1996-2003 Chevrolet Astro, Blazer, Express, S-10, Silverado and P Models
1996-2003 GMC Jimmy, Safari, Savana, Sierra, Sonoma
1996-2001 Oldsmobile Bravada
with 4.3L V6 Engine (VINs W, X - RPOs L35, LF6, LU3)
Supercede: This bulletin is being revised to add additional models. Please discard Corporate Bulletin Number 03-06-01-024B (Section 06 - Engine/Propulsion System).
Condition
Some customers may comment on a rattle-type noise coming from the engine at approximately 1800 to 2200 RPMs.
Cause
The spark, rattle-type noise may be caused by torsional vibration of the balance shaft.
Correction
If detonation noise is present, perform detonation/spark knock diagnostics first.
Install a new tensioner assembly kit using the procedure below.
So yeah, it is the balance shaft and is corrected by installing a timing chain tensioner.
< Message edited by swartlkk -- 10/6/2007 1:49:13 PM >
_____________________________
Kyle-
2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto
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RE: Noise - 10/7/2007 7:02:26 AM
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ZR2003
Posts: 9
Joined: 10/5/2007
Status: offline
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I listened to a mechanic friends advise and changed my oil, to his prefered brand... No more noise!
To say that I am amazed is a huge understatement.
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RE: Noise - 9/13/2008 9:04:11 PM
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muleman
Posts: 54
Joined: 9/27/2007
Status: offline
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my truck is doing this. it sounds like its spark knocking yet i have new plugs and wires, new dist. and cap and ran seafoam through it with no help. how should i go about getting the stealership to fix it....
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RE: Noise - 9/13/2008 9:43:14 PM
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icom
Posts: 6
Joined: 11/19/2007
Status: offline
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quote:
ORIGINAL: muleman
my truck is doing this. it sounds like its spark knocking yet i have new plugs and wires, new dist. and cap and ran seafoam through it with no help. how should i go about getting the stealership to fix it....
mines done it since I bought it..at least for 30,000 miles;I never did find a "cure".I''ve changed all those things too. It doesn''t do it all the time,but when it does its like it has bad gas/pre-ignition/spark knock and whimpy on power
ZR2003
what oil did you use ???
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RE: Noise - 9/14/2008 5:43:38 PM
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muleman
Posts: 54
Joined: 9/27/2007
Status: offline
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thats excatly what mine does right arouund 2k rpms. i think i am going to take it down to the stealership and see what they say. i know they are NOT going to want to own up and fix it.
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