Intermittent tick starting, what you think from the sound?

[olliec420]

09 LC9 182k, just started noticing a tick. Goes away pretty quick after warm up. What you say?

 

[B-train]

I'd probably try to run some MMO or ATF for a few hundred miles and dump the oil. If you are due for and oil change, then do that and substitute 1 qt with either of the mentioned and see how it sounds. If it goes away when the oil thins out and flow increases, then you might have good luck with something that will dissolve varnish, etc.

 

[Geotrash]

09 LC9 182k, just started noticing a tick. Goes away pretty quick after warm up. What you say?

Sounds fine to me. Both of mine will have occasional startup ticks that come and go and that's not loud enough to indicate a problem at this point. Any chance you're missing any exhaust manifold studs on either side? The fact that it goes away as the engine warms up is a telltale sign of an exhaust leak masquerading almost perfectly as a lifter tick.

 

[olliec420]

I'd probably try to run some MMO or ATF for a few hundred miles and dump the oil. If you are due for and oil change, then do that and substitute 1 qt with either of the mentioned and see how it sounds. If it goes away when the oil thins out and flow increases, then you might have good luck with something that will dissolve varnish, etc.

I'll consider that when I come up on next oil change thanks!

 

[strutaeng]

Sounds normal to me.

 

[lyncht1967]

 

[olliec420]

Sounds fine to me. Both of mine will have occasional startup ticks that come and go and that's not loud enough to indicate a problem at this point. Any chance you're missing any exhaust manifold studs on either side? The fact that it goes away as the engine warms up is a telltale sign of an exhaust leak masquerading almost perfectly as a lifter tick.

I had it in the transmission shop a few times this year... They jacked up the flange on the exhaust, maybe their manhandling could have caused something? I'll check the bolts next time I'm under there. TOO COLD IN FL THIS WEEK! brr

But lets say it is a lifter dying... I want to do the AFM delete and add some power (450-550 at crank ideally if possible without changing heads). But I don't want to get in to the bottom end. So, heads off, truck norris cam, new water pump, new oil pump, new lifters, new rockers, new pushrods?, new valve springs?, new head gaskets. Computer tune for performance and to disable AFM (don't know where to get this done properly). What am I missing or am I on the money?

 

[Geotrash]

I had it in the transmission shop a few times this year... They jacked up the flange on the exhaust, maybe their manhandling could have caused something? I'll check the bolts next time I'm under there. TOO COLD IN FL THIS WEEK! brr

But lets say it is a lifter dying... I want to do the AFM delete and add some power (450-550 at crank ideally if possible without changing heads). But I don't want to get in to the bottom end. So, heads off, truck norris cam, new water pump, new oil pump, new lifters, new rockers, new pushrods?, new valve springs?, new head gaskets. Computer tune for performance and to disable AFM (don't know where to get this done properly). What am I missing or am I on the money?

Post in thread '2012 Yukon XL Denali 6.2L Cam Swap Thread'
https://www.tahoeyukonforum.com/thr...nali-6-2l-cam-swap-thread.121671/post-1616690

Bon appetite!

 

[solli5pack]

Take the serpentine belt off and and start it up for a minute. If ticking goes away then you know it one of the pumps or idler/tensioner pulleys. If ticking stays then you verified its in the motor.

 

[iamdub]

09 LC9 182k, just started noticing a tick. Goes away pretty quick after warm up. What you say?

My bet is small exhaust leak.

 

[Foggy]

Sounds fairly normal... Change your oil to be on the safe side in case you've
got a lifter on the edge...
These things also make a lot of fuel injector noise... I've noticed mine more since
my engine cover plastic deal is off

 

[Steve Berg]

09 LC9 182k, just started noticing a tick. Goes away pretty quick after warm up. What you say?

Chevrolet had a buletin regarding this tick on the 5.3. It is the pistons when cold and harmless to the engine, just anoying. Should stop within 2 minutes and from there everything is normal.

 

[Geotrash]

Chevrolet had a buletin regarding this tick on the 5.3. It is the pistons when cold and harmless to the engine, just anoying. Should stop within 2 minutes and from there everything is normal.

I don’t believe that’s the case here. The sound in the video has a frequency of 1/2 crankshaft rotation speed. Piston slap frequency is at crankshaft rotation speed.

 

[easymoney]

Its very normal My 04 does the same thing…after about a minute it quietens down. I thought it was oil not at the lifters and once you run a minute its lubricated. I was going to try lucas oil stabilizer added to the oil and see if that helps but hadnt made it a priority. On cold days the noise is louder i have noticed that so exhaust bolt sounds possible too either way it doesnt sound serious

 

[olliec420]

Sounds fine to me. Both of mine will have occasional startup ticks that come and go and that's not loud enough to indicate a problem at this point. Any chance you're missing any exhaust manifold studs on either side? The fact that it goes away as the engine warms up is a telltale sign of an exhaust leak masquerading almost perfectly as a lifter tick.

I looked under the hood today, it looks like the bolt head is missing between 6 & 8. Must be exhaust leak.

 

[Geotrash]

I looked under the hood today, it looks like the bolt head is missing between 6 & 8. Must be exhaust leak.

Seems likely. You can pinpoint it with a cheap mechanic’s stethoscope from harbor freight