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2006 chevy trailblazer_ss_ls
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313 Posts
Discussion Starter #1
i have noticed while running there is a light ticking/clicking noise coming from the valve covers...is that just the lifters? or is this thing knocking its way through the cover.
 

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2007 chevy
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180 Posts
LS engines are notorious for valvetrain noise.

When you cam it, or go with headers and a converter, it's even louder.

Sounds different than rod knock, thank God.
 

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2005 gmc envoy_sle
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11 Posts
Valve noise

I have had a few Envoy's with the I6 and a Jimmy with the V6 they all had more valve train noise than I would like but ran that way for well over 100k miles. The exhaust also makes a lot of ticking noises.

DGig
 

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2007 chevy
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180 Posts
I don't think I've ever heard an old Blazer (S10 style)/Bravada/Jimmy that DID NOT have ridiculous valvetrain noise. I thought it was a standard issue extra option.:dielaugh:
 

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2004 chevy trailblazer_lt
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201 Posts
LS engines are notorious for valvetrain noise.

When you cam it, or go with headers and a converter, it's even louder.

Sounds different than rod knock, thank God.
I agree. My Camaro sounded like a sewing machine. Ran well though :)
 

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2002 gmc envoy_slt
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The old joke was that the small block chevy engines have tapped since 1928.......they all have some valvetrain noise. Most engines have a faint valve tick noise to them, if you listen careful enough to hear it. My Envoy, my wife's Maxima and even the venerable Honda motor has a slight tick/tap in the valvetrain.
 

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2006 chevy trailblazer_ss_ls
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313 Posts
Discussion Starter #10
yea, but coming from a jeep (late night drunk fun) to powerful suv (no more late night drunk fun) its a lot louder. i wish ihad a actual car garage...because i like to tinker and learn. by far what is the most power robbing emissions equipment on the car.

anybody made there own catch can? i was wondering about doing that rather than buy one.
 

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2004 chevy trailblazer_lt
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yea, but coming from a jeep (late night drunk fun) to powerful suv (no more late night drunk fun) its a lot louder. i wish ihad a actual car garage...because i like to tinker and learn. by far what is the most power robbing emissions equipment on the car.

anybody made there own catch can? i was wondering about doing that rather than buy one.
If your truck is stock (judging by some of your other posts I would have to guess that it is) then a catch can is a waste of money and not worth it.

As far as emissions crap, just removing that isn't going to gain you anything. Add a set of long tube headers and a catback to let the motor breath and at that time delete your AIR system. That will be by far your best bang for the buck mods.
 

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2006 chevy
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86 Posts
my tbss just started ticking really bad at idle . Im sure its a lifter ! Just ordered all new lifters ls7 and chromolly pushrods . 90k miles
 

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2006 chevy trailblazer_ss_ls
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Discussion Starter #14
well the right side sounds a little louder than the left...so it could be something wrong.
 

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2004 gmc envoy_slt_xuv
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691 Posts
Also check for loose and or broken Exhaust Manifold bolts. There have been a lot of broken bolts out there, had (4) on the drivers side myself along with a stripped/cross-threaded nut on the flange connection. Caused lots of exhaust noises (sometimes sounds like a lifter)

I know the I6 was notorious for loose bolts and the V8s seem to be more broken bolts. I ended up getting most bolts out to replace with studs/nuts but had to replace the drivers side head because of broken bolts. This may only be true of the earlier V8s like mine not sure if yours would have this problem.

I have no longer have ticking noises since the exhaust repairs
 

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2003 chevy trailblazer_ls
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55 Posts
In my 20+ years of working with and on SBC engines the only time they stop ticking is when they stop running. Cast iron heads, Aluminium heads, roller cams, flat tappet cams, properly adjusted, improperly adjusted rocker arms, old springs, new springs, etc. I have even heard one bank a little louder than the other in healthy engines. Ifn the tick becomes extremelly lound under pressure, like climbing a hill or wide open throttle take offs, check your oil level and condition. Ifn both are ok then check the oil passages in the head.
 

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2003 chevy trailblazer_ls
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77 Posts
its your fan cluth, mine was doing the same ticking noise and when it started ticking i unhooked the harness going into the fan shroud and it stopped, thats how i figured out it wasnt a lifter
 

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2003 chevy trailblazer_ltz
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254 Posts
its your fan cluth, mine was doing the same ticking noise and when it started ticking i unhooked the harness going into the fan shroud and it stopped, thats how i figured out it wasnt a lifter
I wouldn't jump to conclusions that quick..

Ticking from I6's just like everybody else said, is normal, it gets pretty bad when they're cold I've noticed in mine. Once they warm up it reduces quite a bit.
 

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2006 chevy trailblazer_ss_ls
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Discussion Starter #19 (Edited)
im pretty sure its not the fan, i have listened with my head about a inch away from the valve covers and i can tell a drastic difference. but as the other guy stated its normal im guessing to have one side louder. the only thing that kinda is a give away is when i got this car with 42k on it, the lifters were not loud, now is about to roll over to 50k and i can hear them from outside of the hood. i have warranty so if something goes wrong then thats there to cover it, it's just i hate knowing something is wrong if it is. after work i will see if i can catch some audio of it and you guys can tell me if im just paranoid or if something doesnt sound good :) after reading some post before this, i checked the exhaust and there all tight and snug. i'll also go in and see if the lifters are torqued right.
 

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2007 chevy trailblazer_ss_3ss
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Ticking Noise In Engine - '07 TBSS

Mine started ticking about 6-8 months ago (~48K miles) but it only does it after it has been driven and then shut off, and then restarted several minutes later. It definitely is a lifter; confirmed by my local mechanic who had the same issue with his Tahoe. Told me he switched from Mobil ! to another synthetic (Wolfshead or Pennzoil, I believe) and the problem stopped. Amsoil appears to be a good substitute for Mobil 1 and it will not screw up your warranty, if this is still an issue.
 
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