NEED HELP Got a tick I want to lick

[02FailBlazer]

An engine tick, to be exact. Hoping this is just the timing chain telling me it's tired or some other relatively non-destructive issue. Looked for 4.2L engine noise videos on YouTube and didn't find anything similar.

It produced this sound before and after a drive, so being warmed up or not makes no real difference.

Video link here.

 

[northcreek]

Tell you the truth, I couldn't hear anything that I would be concerned about on a 02 vehicle.

 

[azswiss]

Rather than a tick I would call it more of a click. Does not appear to be related to RPM, sounds more like solenoid or relay.

 

[movietvet]

https://twitter.com/x/status/2041629315394150740

 

[movietvet]

That noise in your video sounds like the a/c compressor is cycling, on and off. Turn the defroster off or a/c off or just shut down the entire heating-a/c system and see if noise goes away.

 

[Mooseman]

All I heard was an odd click here and there, as @movietvet said, like an A/C clutch cycling. Try pulling the A/C clutch relay. To see if it's something belt driven, take the belt off and start it. No noise, then it's something belt driven. Would also be a good time to check stuff like the water pump, PS pump, pulleys, etc.

And I also remembered something specifically for 02. They did have a ticking issue with the fan clutch. GM issued a PCM update for that as well as un updated fan clutch but I would imagine it would have been replaced by now. The update might fix it.

 

[Mooseman]

 

[Mooseman]

Thread 'clicking sound near fan clutch'

Apr 7, 2012

I am glad I found you guys. It has been several months since I used the other site and was kinda out of the loop. Didn't know you moved

Sorry but I have a "fan clutch" ?? for you.
I had a clicking sound on my 03 trailblazer (100K miles) that disappeared when I disconnected the link to the fan clutch.
Then I started getting SES messages. It was the engine coolant temperature warning that indicates bad therm or coolant sensor. I replaced them both and then I replaced the fan clutch and serpentine belt. Took me all day but I got it done.
Now:
No more SES warnings and temperature is rock...

• gkrenzer
• Replies: 7
• Forum: Engine & Drivetrain

 

[02FailBlazer]

Guess I should have specified which noise I was referring to. My bad. I meant the persistent noise heard throughout the video that in retrospect is better described as a "rattle" than a "tick". It's a bit more noticeable IRL, phone camera doesn't do a great job picking it up.

The sound I'm referring to fades when I pan the camera left, and gets a bit louder when I pan it right.

Doesn't sound like there's a serious problem, though now I'm noticing the other "tick" or "click" that I think everyone else latched on to. I was so focused on the engine noise I didn't even notice it.

 

[Mooseman]

You mean like a sewing machine noise? Maybe the timing chain? Was it ever quiet before? Kinda sounds like mine actually.

 

[movietvet]

You mean like a sewing machine noise? Maybe the timing chain? Was it ever quiet before? Kinda sounds like mine actually.

When I first road tested my girl's 2002 TB, I posted on here in December of 2022 and asked about the engine noise being normal. I was told my a member, I forget who, that the engine sewing machine sound was normal. IMO, that is a normal sound for the 4.2 because her TB runs perfect.

 

[02FailBlazer]

You mean like a sewing machine noise? Maybe the timing chain? Was it ever quiet before? Kinda sounds like mine actually.

Yeah, something like that. Listening to videos of other engines timing chain noise is the closest sound I've found. I swear it was quieter in the past but maybe I'm just being paranoid or noticing things I haven't paid much attention to before now that I'm really going through the whole vehicle.

Anyway, sounds like I don't need to concern myself with this right now.

 

[c good]

Mine makes a clicking sound when it's warming up. It's the heat shield and the exhaust manifold coming up to operating temperature. It stops when it's warmed up.

I know you said it was there all the time so it's probably something else.