I have a really loud clacking noise coming from my engine that changes w/ engine RPM, I thought it was the lash on the rockers b/c they were a little loose and it's much louder w/ valve covers off. I tightened them up and it got louder? wtf? What else might be making this racket?



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-=1987 Formula 350=-

Member Greater Cincinnati F-Body Association

 

I'm having the same sound, mine is coming from the drivers side and is louder under the car.

 

I am having a loud noise also 88GTA with stock 5.7 liter. It sounds like something is inside of the tpi unit bouncing around. It does it for a little while and stops then starts up again. I checked the pushrods and valves and everything seems fine. What the heck is it? If you place your hand on top of the TPI unit, you can definatly feel something clanking.

 

I heard somewhere that if you have a 700-R4,that is the oil pressure reg. in your auto tranny.

 

Regulator in the tranny?

If it was a tranny problem, wouldn't the noise come from the tranny, not the engine?

 

The 700-R4 is often the source of clacking. Something to do with the pressure and the torque converter. Mine stopped when I put in a new converter.


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1986 Trans Am
carbed 350 - .30 over with 9.75:1 comp.
+- 315hp/390ft lbs.
700-R4 with 2500 stall
3.27 (ick!) gear
SLP 1 3/4" headers w/MAC catback and cat.
96 5 stars
SFC's, braces, arms, and a bunch more expensive stuff
no timeslips yet

 

Well if it is coming from the engine, it could be a collapsed lifter.
On the subject of the converter, since I got a tranny rebuild and used NON lockup converter I have had a clacking noise to near the converter or the exhaust not really sure though.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B Megashifter, 5" Autometer Tach w/shift lite
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage
"There is nothing more addicting than speed"

 

Can't you use an automotive stethascope(sp?) on the valve covers to check for a bad lifter or such?