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09-04-2005, 12:53 PM #1
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My life is a- Ben Stiller movie.
tap tap tap tap tap tap tap tap tap tapping
here's the scenerio:
car club was in a parade, naturally revving engines/making noise. I probably went to 6500 and 7000 regularly [imagine doing that about 90 times over the course of a mile] Pulled into a parking lot afterwords to hear i'm the only car with a really high pitch tapping / pinging noise coming from the engine....shut off the car, lifted the hood to cool it off for a good 45 minutes. Turned it on....noise is still there. Oh, someone said that since i'm running fully synthetic oil that could be the problem?
What'd i do? What do i do? what's it gonna cost?
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09-04-2005, 01:20 PM #2SShArK>Guest
maybe a pushrod?
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09-04-2005, 01:20 PM #3
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Black- 383 Procharged & N20 Vert
6500 to 7000? I hope you have an aftermarket drivetrain.
Other wised you floated the valves and they tapped the pistons.
Bent valves.
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09-04-2005, 04:01 PM #4
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My life is a- Ben Stiller movie.
local car guru says it's a lifter. anyone know if an LT1 lifter can replace an LS1 lifter?
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09-04-2005, 05:06 PM #5
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Black- 383 Procharged & N20 Vert
Stock valvetrain?
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09-04-2005, 05:32 PM #6
sounds like a bent pushrod or a bent valve tapping the piston, I would pull the heads off and inspect before you run the car again.
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09-04-2005, 05:45 PM #7
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My life is a- Ben Stiller movie.
Originally Posted by Ed Blown Vert
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09-04-2005, 06:28 PM #8
It sounds like a pushrod to me. It's a light tap/tick noise that increases with RPM...you'll also notice a loss of power over ~5k rpms. I bent a couple a few months ago when I shifted from 3rd to 2nd @ 100mph...whoops!
It is a very easy fix. Remove emissions crap, coil pack brackets, valve covers. Remove rocker arms and the pushrods pull right out. When you roll them on a flat surface you'll notice which are bent - they won't roll smoothly. New pushrods are very cheap. When you reinstall don't forget correct torque specs & loctite on the rocker arm bolts.
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09-04-2005, 07:26 PM #9
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My life is a- Ben Stiller movie.
kelli, my savior! thanks-yes thats what it does too, increases with rpm
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09-05-2005, 09:45 AM #10
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Light Pewter Metallic- 2000 Camaro SS M6
Whoa...! Don't do that kind of revving with the stock valvetrain.
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09-05-2005, 09:51 AM #11
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Black- 383 Procharged & N20 Vert
Originally Posted by dipherentdesign
Ok, its either bent pushrods or valves.
Don't rev it over 6k on a stock valvetrain. You probably aren't making anymore power over 5800 anyways.
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09-05-2005, 09:52 AM #12
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Red Tint Jewelcoat- 2008 Trailblazer SS
Originally Posted by keliente
If it is only one pushrod bent, PM me. I have one still in wrapper from GM.
If you go with aftermarket pushrods, they won't bend to save your valves. If you go around revving like that you will pop a valve stem with hardened pushrods.
I wouldn't do revving like that WITH an upgraded valvetrain. You are gonna break something doing that. Overall, try not to free-rev.2008 Trailblazer SS
Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
Lowered, HID's, tinted.
1999 Pontiac Trans Am WS.6 #1747 SOLD
531.1 RWHP 481.3 FT/Pounds all motor.
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09-05-2005, 07:34 PM #13
6500-7000 RPMs? did u mess with the rev-limiter with a programmer or something because to the best of my knowledge it wont let u rev that high from the factory right?
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09-05-2005, 07:38 PM #14Originally Posted by LS1Power06
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09-05-2005, 09:20 PM #15
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anybody know where i can get stock pushrods OVERNIGHTED to me?
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09-05-2005, 09:29 PM #16
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Black- 383 Procharged & N20 Vert
I have a set, but don't think I can get them out tomorrow.
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09-06-2005, 02:17 PM #17Originally Posted by dipherentdesign
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09-06-2005, 07:12 PM #18
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Originally Posted by sscrazy
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09-08-2005, 03:00 PM #19
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How were you able to rev it that high without hitting the limiter?
*EDIT* My bad, completely missed about 5 posts there.2001 WS6, M6, Black/Black
!Baffles to sealed airbox, MTI lid with K&N, Bo White ported TB, Pacesetter coated LTs, TSP catted-Y, Flowmaster catback, Pro 5.0 shifter, BMR STB and SFCs
343hp and 357tq before ported TB on HPTuners
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09-09-2005, 06:31 PM #20
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OK HERE'S THE UPDATE!!!!
so my buddy an i crackopen the valve cover on the passenger side to see that rocker #2 is EXTREMELY loose. So we inspect the pushrod; it's fine. Inspect the rocker; it's fine...oh shit...gotta keep digging-it was a broken LIFTER! it took us like 6 hours of unscrewing, unbolting and digging....we had to take off the manifold covers, the intake and the headders to finally reveal a single broken lifter. It sucked that we had to do all that but it was better than being charged 700+ in time/parts to have the pros do it.
i've learned a lot about this engine just in doing all of this...
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