For all those with that "mystery rattle". - The 1947 - Present Chevrolet & GMC Truck Message Board Network

86SILVERADO · 02-04-2004, 09:45 PM

Well,

I was breaking in the new cam in my REBUILT 305!

LOL.......I like 20 MPG remember?... and I heard this rattle which I had been hearing through the 305 before I did the re-build, the 350 that was in there for a bit and is now in the dump, and two different transmissions. I am kind of one with all the grinds and growls, bumps and rattles that just seem to go with these old trucks but I do have a pretty good idea of what they come from and so they never get to me much. This noise had been bugging me for a while though because it sounded alot like the flexplate rattling against the dust cover or a loose converter bolt or something and I kept checking but found nothing amiss down there. Well while I was breaking in the cam I was sitting in the drive in neutral with the door open and wouldn't you know it but there is this sound again consistently at 1700 rpms. I put my head down alongside the cab to listen and out of the corner of my eye I saw the gas tank filler door vibrating. I let the throttle drop down to 1500 and sure enough it stopped. back up at 1700 there it was again. So before you go replacing your next torque converter take a look at the filler door and you may end up saving yourself some time and $$$.

**swervin ervin** · 02-04-2004, 09:46 PM

You get 20 mpg from a 305?? How??

bigd65 · 02-04-2004, 10:04 PM

I wanna know that as well, Mike. i may be interested in going back to a 305 (not really)

86SILVERADO · 02-04-2004, 10:41 PM

LOL... the way I drive.
I could put a block off plate over the secondaries and never know the difference. Also overdrive and 2.73's help. The carb came off my 86 California truck. I think that has something to do with it as well. As much as you love to hate all the electronics and emissions crap (and believe me I do) it does make a difference.

Remember those days mike?

C-10volvo · 02-04-2004, 10:52 PM

i get atleast 15 in the city and 17 on the highway. gotta love all thoes vacuum lines!!

86SILVERADO · 02-04-2004, 11:08 PM

All country roads around here. 35 to 55 speed limits. I pretty much just get on those roads and cruise. I don't think I have ever driven my trucks into the city once. That's what the volvo is for.

I am a volvo fan as well. Have had a couple 240's and now the 1980 diesel 264.

86SILVERADO · 02-04-2004, 11:23 PM

About the vacuum lines,

That is why I bought the 67. Now that is how an engine bay should look. Ahhhhhhh

Russell · 02-05-2004, 12:35 AM

I hooked all my vac stuff back up too, but I organized it all, and it actually doesn't look all that dirty at all. That looks like a Carter Q-Jet, the same as the one on my truck, mine needs a rebuild, but works pretty good, gives a real kick when you open those secondaries!

02-04-2004, 09:45 PM	#1
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	For all those with that "mystery rattle". Well, I was breaking in the new cam in my REBUILT 305! LOL.......I like 20 MPG remember?... and I heard this rattle which I had been hearing through the 305 before I did the re-build, the 350 that was in there for a bit and is now in the dump, and two different transmissions. I am kind of one with all the grinds and growls, bumps and rattles that just seem to go with these old trucks but I do have a pretty good idea of what they come from and so they never get to me much. This noise had been bugging me for a while though because it sounded alot like the flexplate rattling against the dust cover or a loose converter bolt or something and I kept checking but found nothing amiss down there. Well while I was breaking in the cam I was sitting in the drive in neutral with the door open and wouldn't you know it but there is this sound again consistently at 1700 rpms. I put my head down alongside the cab to listen and out of the corner of my eye I saw the gas tank filler door vibrating. I let the throttle drop down to 1500 and sure enough it stopped. back up at 1700 there it was again. So before you go replacing your next torque converter take a look at the filler door and you may end up saving yourself some time and $$$. __________________ 86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club!

02-04-2004, 09:46 PM	#2
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	You get 20 mpg from a 305?? How?? __________________ Mike 1985 Chevy C-10

02-04-2004, 10:04 PM	#3
bigd65 Registered User Join Date: Mar 2000 Location: Clute, TX. Posts: 1,935	I wanna know that as well, Mike. i may be interested in going back to a 305 (not really) __________________ 2004 Silverado Crewcab 1972 Chevy Monte Carlo 2017 Chevy Tahoe

02-04-2004, 10:41 PM	#4
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	LOL... the way I drive. I could put a block off plate over the secondaries and never know the difference. Also overdrive and 2.73's help. The carb came off my 86 California truck. I think that has something to do with it as well. As much as you love to hate all the electronics and emissions crap (and believe me I do) it does make a difference. Remember those days mike? Attached Images __________________ 86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club! Last edited by 86SILVERADO; 02-04-2004 at 10:56 PM.

02-04-2004, 10:52 PM	#5
C-10volvo Registered User Join Date: May 2003 Location: Lake Oswego, Oregon Posts: 1,028	i get atleast 15 in the city and 17 on the highway. gotta love all thoes vacuum lines!! __________________ Ken Morgan For fun: 1964 Volvo 122 For slow: 1984 Chevrolet C-10 For everything else: 1997 BMW M3

02-04-2004, 11:08 PM	#6
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	All country roads around here. 35 to 55 speed limits. I pretty much just get on those roads and cruise. I don't think I have ever driven my trucks into the city once. That's what the volvo is for. I am a volvo fan as well. Have had a couple 240's and now the 1980 diesel 264. __________________ 86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club! Last edited by 86SILVERADO; 02-04-2004 at 11:16 PM.

02-04-2004, 11:23 PM	#7
86SILVERADO Registered User Join Date: Dec 2002 Location: Hills of Western Mass Posts: 626	About the vacuum lines, That is why I bought the 67. Now that is how an engine bay should look. Ahhhhhhh Attached Images __________________ 86 Silverado C10 back to 305 power! 67 C30 Dually Dump, with 350 transplant, Rockhauler 05 Duramax 3500 "If at first you don't succeed, try a bigger hammer" Member of the 1-Ton club!

02-05-2004, 12:35 AM	#8
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	I hooked all my vac stuff back up too, but I organized it all, and it actually doesn't look all that dirty at all. That looks like a Carter Q-Jet, the same as the one on my truck, mine needs a rebuild, but works pretty good, gives a real kick when you open those secondaries! __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

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