Hey ,my 84 LG4 has been making a very odd (to me anyway) sound for the past week or so. To me it sounds just like when the bearings on my alternator went, and in part the noise was (i loosened the belt and the sound lightened), but the rest of the noise is coming from cylinder 7. the sound is either inside the cylinder or inside the valve covers i'm assuming/hoping valve covers. theres no noticeable loss in power if that indicates anything. anyway my question is what exactly could this sound be? rocker, pushrod??? also what can i do to remedy it? thanks, derek

 

It could be that theres so much play in the rocker to valve clearance that it's chattering. I'd take the cover off and check for clearances.

 

Yeah, I agree, its probably from too little lash on your rocker arms. Just pull off the valve covers. I'll send you a file on the best way to do that.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Accel High Flow TPI Baseplate, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, Jet TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET: 14.32 @ 97.7mph
(corrected for elevation)

 

I had tapping commin from my valve covers but it was only a exhaust leak. Dose it get louder with the engine load? can u hear it at idel or what?

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I Love Smokin Tires
(stangs fear me)

 

yeah it gets louder on load and yes i can hear it at idle

 

Might be a stupid response but... are you sure the car has oil??

 

Usaully if it is a lifter tick it would be loud all the time and the sound wouldn"t change that much on a load it just gets faster.A exhaust leak can almost sound the same as a lifter tick or loose rocker tapping sound,but can go from being quite, and hardly noticeable to getting very loud at higher rpms.

------------------
I Love Smokin Tires
(stangs fear me)

 

and oh yeah...it doesnt stink or anything under the hood like i would think an exhaust leak would...just thought id mention that

 

thanks for the response...im not exactly sure if it gets louder...ill go listen while someone revs it for me and see...i think mostly it just does get faster...not sure though because now that you make me think about it i cant remember...anyway thanks for all the responses

 

k just checked...the sounds just gets faster, not louder its not very loud as it is...have to get your head pretty close to the valve covers to hear it...but it is there...so anyway does that mean its loose rocker?

 

Have you checked your oil level lately? Are you using unacceptably low viscosity oil, like 5W-30 or 0W30? Has the oil been changed within the last 3,000 miles?

Just asking...

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Later,
Vader
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Justice and Freedom will Prevail

 

its 10-30, changed 500 miles ago and right under the full line

 

Sounds like it is time to run through the rocker (valve lash) adjustments to me.................

 

thanks for all the input guys, ill check out the valve stuff tomorrow morning first thing

 

Dan87IROC-Z - Can you send me the file as well? I would really appreciate it. Thanks. hirspat@hotmail.com

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Pat Hirsz
www.iit.edu/~hirspat/MyPage2.htm
88 305TBI
Mods:Hooker Aerochamber 3" exhaust, no cat,SLP 1 5/8" headers and y-pipe March pullies, no smog, 180 thermo,
14x4 K&N, 3.42 gears(open), Ultimate TBI Mods,AFPR,MSD(ignition,coil&wires),Edelbrock TBI Manifold, 190ltr/hr fuel pump,
Eibach springs with KYB's all around,
Centerforce dual friction clutch
Harwood cowl hood, Z-28 wing, fresh paint(black)
120,000 miles, 5spd, T-tops
0-60mph-7.0s-Gteched

92 RS, 305TBI, auto, 3.08 gears, 180 thermo, glasspack (no muffler)

 

What? The owners manual says use 5W-30... now i'm confused

 

does any one have that file... i think i need to adjust valve lash some one told me when u adjust ur timing u got to... i hear some loud ticking from bothe VC