help! whats this sound?!?! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ocbaud · 05-07-2005, 08:12 PM

http://www.ocbaud.com/pics/clicking.AVI

its coming from the rearengine/flexplate area. i checked the flexplate and torque conveter bolts and none are loose. nothing is hitting and it all LOOKS fine. whats happening? this started yesterday. my oil pressure is just like normal, running really high like always.

Russell · 05-07-2005, 09:15 PM

I betcha your flexplate is cracked...

Mine made the exact same noise, and when I took the flexplate off, it was totally broken around the whole way, save an inch wide portion... Another start or two, and my flexplate would have broken clean off and ruined at least something...

ocbaud · 05-07-2005, 09:19 PM

its not cracked. I had the flexplate on my old 305 crack and it sounded completely different. I turned the engine at the flexplate while under there and checked with a light and i saw NO cracks anywhere. Its also a touch ass TCI flexplate too thats SFI approved.

jermasaurus · 05-08-2005, 01:20 AM

I had a metric 200 make that noise and it was a cracked torque converter stator support.

1974gmc · 05-08-2005, 10:39 AM

ya i agree, a cracked flexplate sounds different than that.

NeCrOmAnCeR · 05-08-2005, 11:25 AM

Does the sound change when the truck is placed in gear? Does it change upon deceleration etc?

Slonaker · 05-08-2005, 11:27 AM

I don't know, but I have it too.

Mine does it a little slower, but I probably have a slower idle than you with my stock 305.

I thought it was my flexplate, but since I was about to pull the transmission, I wasn't too worried about it. I pulled the flexplate off, and it was perfect. After I put the transmission back in, it didn't make that sound for a week. I thouht it might have been coming from the transmission, and been repaired, but then it came back.

It does not really sound like a knock, at least any that I have ever heard. I doesn't really sound like a lifter, either.

I hope someone here has some good ideas.

Slonaker

ocbaud · 05-08-2005, 01:02 PM

Quote:

Originally Posted by NeCrOmAnCeR

Does the sound change when the truck is placed in gear? Does it change upon deceleration etc?

same sound, it does speed up when i accelorate and slow down when i decelerate.

**old Rusty C10** · 05-08-2005, 04:23 PM

loose cat converter cover?

ocbaud · 05-08-2005, 04:26 PM

Quote:

Originally Posted by old Rusty C10

loose cat converter cover?

no cats or cover

its in the drivetrain somewhere. either my engine is screwed or my tranny is screwed

Newt408 · 05-08-2005, 05:09 PM

I've got the same noise. I was told it was piston slap. Readjusted my rocker arms twice and replaced my lifters once because I thought the noise was comming from the top of the engine, but it sounds just as bad from the bottom.

ocbaud · 05-08-2005, 05:24 PM

Quote:

Originally Posted by Newt408

I've got the same noise. I was told it was piston slap. Readjusted my rocker arms twice and replaced my lifters once because I thought the noise was comming from the top of the engine, but it sounds just as bad from the bottom.

YEAH, i thought it was a lifter. so i readjusted them really good yesterday, and it just kept making the noise. its actually a lot louder under the engine than on top

ocbaud · 05-09-2005, 05:27 PM

its the tranny. i unbolted the torque conveter and ran the engine and it made no noise. as soon as i bolted back up the torque conveter, the noise started again.

PHOENIX · 05-09-2005, 06:00 PM

Stethoscopes work well for pin pointing noise.

NeCrOmAnCeR · 05-09-2005, 09:17 PM

Bad pump??

05-07-2005, 08:12 PM	#1
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	help! whats this sound?!?! http://www.ocbaud.com/pics/clicking.AVI its coming from the rearengine/flexplate area. i checked the flexplate and torque conveter bolts and none are loose. nothing is hitting and it all LOOKS fine. whats happening? this started yesterday. my oil pressure is just like normal, running really high like always.

05-07-2005, 09:15 PM	#2
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	I betcha your flexplate is cracked... Mine made the exact same noise, and when I took the flexplate off, it was totally broken around the whole way, save an inch wide portion... Another start or two, and my flexplate would have broken clean off and ruined at least something... __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

05-08-2005, 10:39 AM	#5
1974gmc In Progress Join Date: Feb 2005 Location: Kamloops, BC, Canada Posts: 312	ya i agree, a cracked flexplate sounds different than that. __________________ 1993 Chevrolet K2500 454 4L80E 1974 GMC 1/2t 2wd Stepside 305 auto sold 1985 Ford Mustang GT 5.0 5spd

05-08-2005, 11:27 AM	#7
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	I don't know, but I have it too. Mine does it a little slower, but I probably have a slower idle than you with my stock 305. I thought it was my flexplate, but since I was about to pull the transmission, I wasn't too worried about it. I pulled the flexplate off, and it was perfect. After I put the transmission back in, it didn't make that sound for a week. I thouht it might have been coming from the transmission, and been repaired, but then it came back. It does not really sound like a knock, at least any that I have ever heard. I doesn't really sound like a lifter, either. I hope someone here has some good ideas. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

05-08-2005, 04:23 PM	#9
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,280	loose cat converter cover? __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

05-07-2005, 09:19 PM	#3
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	its not cracked. I had the flexplate on my old 305 crack and it sounded completely different. I turned the engine at the flexplate while under there and checked with a light and i saw NO cracks anywhere. Its also a touch ass TCI flexplate too thats SFI approved.

05-08-2005, 01:20 AM	#4
jermasaurus Registered User Join Date: Dec 2004 Location: New Lenox, IL Posts: 442	I had a metric 200 make that noise and it was a cracked torque converter stator support.

05-08-2005, 11:25 AM	#6
NeCrOmAnCeR Registered User Join Date: Feb 2004 Location: Hodgenville, Ky Posts: 735	Does the sound change when the truck is placed in gear? Does it change upon deceleration etc?

05-08-2005, 05:09 PM	#11
Newt408 Registered User Join Date: Feb 2004 Location: west texas Posts: 71	I've got the same noise. I was told it was piston slap. Readjusted my rocker arms twice and replaced my lifters once because I thought the noise was comming from the top of the engine, but it sounds just as bad from the bottom. __________________ The way of a fool is right in his own eyes:but he that hearkeneth unto council is wise. Proverbs 12:15

05-09-2005, 05:27 PM	#13
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	its the tranny. i unbolted the torque conveter and ran the engine and it made no noise. as soon as i bolted back up the torque conveter, the noise started again.

05-09-2005, 06:00 PM	#14
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	Stethoscopes work well for pin pointing noise. __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

05-09-2005, 09:17 PM	#15
NeCrOmAnCeR Registered User Join Date: Feb 2004 Location: Hodgenville, Ky Posts: 735	Bad pump??



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