It sounds like you might be starving for fuel. I had a 78 Chevy K-10 SWB
with a small block 400ci in it. I did some "modifications" to the motor
and didn't think to do anything to the carb. It would surge in corners
(only while accelerating or maintaining speed), and it would surge at
higher lean angles (off-road). The little Q-Jet just didn't have enough
fuel in the float bowl to keep up with demand when it was sloshing around.
I put a Holley 750CFM on it and solved the problem (and created a few more,
but that's another story). I would use an Edlebrock if I did it again
today. This is what I "think" was happening to the truck, the carb change
solved it, but I have no good proof that this was the "real" problem.
You might be able to check it by pulling it up on a set of ramps to see if
you can force the problem. Good luck with it.
Kevin Lake
56 GMC Suburban/napco
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> From: SHAWN & JO <YOOPERWANNABE@PRODIGY.net>
> To: oletrucks@autox.team.net
> Subject: [oletrucks] drivng rumble
> Date: Tuesday, April 27, 1999 3:03 PM
>
> All right guys, I need some help diagnosing a problem, its probably
> something simple but I'll still take advice cause it will cut down on
> the amount of time I have to work on it.
> I just bought a 1981 1 ton chevy with a 454 and 400 turbo. When I go
> 55-65mph the truck rns at a pulse/rumble. It happens mostly with the gas
> applied and not while coasting. It feels like a rythmic pulsing coming
> from the engine/trans. I had a F*rd that did the same thing. It wasn't a
> smooth ride at 65+ but a pulsing sensation...any ideas? The engine/trans
> only has 30,000 original miles (verifiable). Trans fluid is clean and
> doesn't smell burnt, same for engine oil.... Help!
> Shawn
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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