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Username Post: L29 7.4L 454 noise        (Topic#348079)
Big Chevy 
Forum Newbie
Posts: 3
Big Chevy
Reg: 11-06-17
11-06-17 11:37 AM - Post#2713438    

I recently bought my brother's '99 Suburban, that's been sitting for a very long time. It has a ticking noise that I just can't figure out. I added an oil treatment a few weeks ago, and 'stethoscoped' everything I could, and nothing. The noise is everywhere it seems. Anyone have any answers?



Edited by Big Chevy on 11-06-17 11:39 AM. Reason for edit: No reason given.

 
someotherguy 
Moderator
Posts: 28694
someotherguy
Age: 48
Loc: Texas
Reg: 08-01-03
11-06-17 12:46 PM - Post#2713446    
    In response to Big Chevy

Welcome to Chevytalk,

How many miles on it, and do you know how it was maintained previously?

These engines have non-adjustable rockers. Instead of a stud with a locknut, they are simply bolted in and torqued to spec.
So if they are worn, they will tick. Could also be a bent pushrod (or several) if the engine has been over-revved. Finally, if the tick is significant, it could be a failed lifter.

Comp Cams sells an inexpensive kit to convert the rockers to adjustable. It has studs with the correct sized threads to screw into the heads, spacers to go into the stock rockers, and new locknuts. It's about $100. I will caution you that I had trouble with this kit the first time I bought it and the locknuts damaged the threads on a couple of the studs. I put everything back together stock for a while but the ticking got to me and I bought the kit again and took my chances; worked out OK second time around.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
Big Chevy 
Forum Newbie
Posts: 3
Big Chevy
Reg: 11-06-17
11-07-17 11:19 AM - Post#2713576    
    In response to someotherguy

I made the mistake of going through private email, Richard. Don't know if you got it, but here's the recap: The truck only has 60k miles on it, has been terribly neglected/not even driven in the last 6 years. It has sat in my brother's yard mostly unattended, and may have rat damage. I'm sure everything on it is original from the factory, except a few things I've done for it to date. The previous owner before my brother apparently worshiped the vehicle, and if the paint is any evidence, he must have garaged it if he wasn't driving it. The original/first owner, I haven't any idea how they took care of it, but it was a special order, with every option for towing/camping. I'm beginning to think my ignition system may have rat damage, and the noise I'm hearing is external spark action. When I feel like spending more money on it, after new tires, shocks, stereo and odds and ends, I'm going to invest in new wires and plugs. I just don't want to believe I may have piston slap, or even rocker issues. I can't hear anything in there, and this sound is everywhere, and nowhere in particular. I suppose I could wet the ground, stand in my bare feet and grab hold of the block and see if I don't get launched out of the puddle... otherwise, it's easier to just replace these components than to test each wire individually.

Sam



 
someotherguy 
Moderator
Posts: 28694
someotherguy
Age: 48
Loc: Texas
Reg: 08-01-03
11-07-17 11:30 AM - Post#2713577    
    In response to Big Chevy

Yeah, at 60K I would seriously doubt any wear/damage in the valvetrain unless the truck showed signs of real abuse.

One method that can help find leaking spark is to run the engine in a dark garage, and mist it with a spray bottle. Just take care not to get too close to any moving parts in an unfamiliar engine bay in the dark!

Don't overlook leaking exhaust joints or leaks elsewhere. Truck may be low mileage but if it sat a lot, and was just cranked up every now and then, a lot of condensation may have sat in the exhaust and rotted through somewhere.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
Big Chevy 
Forum Newbie
Posts: 3
Big Chevy
Reg: 11-06-17
11-07-17 12:02 PM - Post#2713580    
    In response to someotherguy

Very god suggestion! Never thought about the dark and a spray bottle. And, yeah, fans and such can really make for a bad experience! Eventually, I'm going to go with some headers and dual exhaust, anyhow. Thanks again!

Sam



 
454cid 
Valued Contributor
Posts: 2854
454cid
Age: 45
Loc: West Michigan
Reg: 02-18-12
11-07-17 05:22 PM - Post#2713606    
    In response to Big Chevy

  • Big Chevy Said:
I recently bought my brother's '99 Suburban, that's been sitting for a very long time. It has a ticking noise that I just can't figure out. I added an oil treatment a few weeks ago, and 'stethoscoped' everything I could, and nothing. The noise is everywhere it seems. Anyone have any answers?



What did you use for a stethoscope? My uncle likes to use a piece of heater hose. I have not had any reason to do it myself, yet.

What kind of oil treatment did you use? A lot of that stuff is just a money grab, in my opinion. If I use anything besides engine oil, it's Marvel Mystery Oil.

My engine ticks a bit when cold, but I don't notice much after it warms up. I have over 275K miles on my engine.


99 K3500 RCLB


 
bowtie44s 
Valued Contributor
Posts: 3965
bowtie44s
Age: 35
Loc: wv
Reg: 08-29-12
11-08-17 03:44 AM - Post#2713635    
    In response to 454cid

  • 454cid Said:
What did you use for a stethoscope?



You can get a mechanic's stethoscope at Harbor Freight for around $4. They actually work pretty well.

Jeff

'88 Chevy K3500, aluminum head roller cam 511inĀ³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
someotherguy 
Moderator
Posts: 28694
someotherguy
Age: 48
Loc: Texas
Reg: 08-01-03
11-08-17 08:56 AM - Post#2713656    
    In response to bowtie44s

Dunno about the HF one but I bought one years ago from Lisle. Anyway the metal probe end of it is really useful as it lets you know pretty clearly when you've touched it on whatever is making noise.



Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
454cid 
Valued Contributor
Posts: 2854
454cid
Age: 45
Loc: West Michigan
Reg: 02-18-12
11-08-17 12:35 PM - Post#2713664    
    In response to bowtie44s

  • bowtie44s Said:
  • 454cid Said:
What did you use for a stethoscope?



You can get a mechanic's stethoscope at Harbor Freight for around $4. They actually work pretty well.



The advantage of the hose is that it's all rubber. You can't short anything with it, and if it gets caught in the belt drive it likely won't do any damage.


99 K3500 RCLB


 
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