better mpg and weird rattling - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ocbaud · 12-01-2002, 01:24 AM

earlier tonight for a stop, when i hit the gas about half way, there was this loud rattling coming from behind me on the drivers side. i was thinking it was the exhaust supports coming loose, buts its not that. could it possibly be a bearing in the rear end?

oh and i'm now making 9.85 mpg

about 1 mpg over what i made before my new plugs. i'm hopeing that since i wont be messing with the timing anymore,and if i keep my foot out of the gas, i should break 10 mpg!!!

79BIG10 · 12-01-2002, 03:56 AM

Was it from more underneath the truck or near the back? Maybe a bolt loose somewhere in the bed's bolts? Maybe TC bolts? I would get under there and see what might be making the noise.

ocbaud · 12-01-2002, 03:57 AM

it was coming from under the truck, near the back

i'll check stuff tommorow(bolts and the like)

Big Paul · 12-01-2002, 04:44 AM

Check your wheels too. Just go around all four sides and pull back and forth on the tire. Could be a loose wheel, i've had rattling problems because of that.

Check U-joints as well. Could be worn out and shaking around.....

**swervin ervin** · 12-01-2002, 11:09 AM

One thing I've learned with these trucks is noises are almost always, never what you think they are. The worst noises are the ones that only happen at certain times, like when driving at certain speeds. These will drive you nuts trying to find them.

It might be something with the brakes. It could be a ton of things.

Good luck with the search.

12-01-2002, 01:24 AM	#1
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	better mpg and weird rattling earlier tonight for a stop, when i hit the gas about half way, there was this loud rattling coming from behind me on the drivers side. i was thinking it was the exhaust supports coming loose, buts its not that. could it possibly be a bearing in the rear end? oh and i'm now making 9.85 mpg about 1 mpg over what i made before my new plugs. i'm hopeing that since i wont be messing with the timing anymore,and if i keep my foot out of the gas, i should break 10 mpg!!!

12-01-2002, 03:56 AM	#2
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	Was it from more underneath the truck or near the back? Maybe a bolt loose somewhere in the bed's bolts? Maybe TC bolts? I would get under there and see what might be making the noise. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

12-01-2002, 04:44 AM	#4
Big Paul Iamnotanofficerofthelaw Join Date: Feb 2002 Location: Turlock, California Posts: 352	Check your wheels too. Just go around all four sides and pull back and forth on the tire. Could be a loose wheel, i've had rattling problems because of that. Check U-joints as well. Could be worn out and shaking around..... __________________ ~Paul~ '96 C1500 Silverado- Vortec 5.0L/Exhaust/Stock '87 S-10 Ext Cab- 2.8L/700r4 KIA Caught fire 12/7/03

12-01-2002, 11:09 AM	#5
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	One thing I've learned with these trucks is noises are almost always, never what you think they are. The worst noises are the ones that only happen at certain times, like when driving at certain speeds. These will drive you nuts trying to find them. It might be something with the brakes. It could be a ton of things. Good luck with the search. __________________ Mike 1985 Chevy C-10

12-01-2002, 03:57 AM	#3
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	it was coming from under the truck, near the back i'll check stuff tommorow(bolts and the like)



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