Do Big Engines with custom exhaust vibrate ??

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RCjesse - 21 Feb 2007 04:19 GMT

I'm about to buy a 96 firebird 5.7 LT-1. I test drove it today, but it felt
kind of rough when in idle, but as soon as I steped on the gas, that thing
would spin tires. Is this a normal vibration with big motors? The oil
pressure would be at a quarter when idling, then half way or a little more
when cruising at normal speeds. Engine seemed normal, no smoke or noises.
Thanks for any comments since I have never ever driven big sport muscle cars
before. Thanks.

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WayneC - 21 Feb 2007 06:21 GMT

> I'm about to buy a 96 firebird 5.7 LT-1. I test drove it today, but it felt
> kind of rough when in idle, but as soon as I steped on the gas, that thing
[quoted text clipped - 3 lines]
> Thanks for any comments since I have never ever driven big sport muscle cars
> before. Thanks.

No, I don't think that's normal, an LT-1 V8 should idle very smoothly
unless it's had a cam change. If you're equating noise with smoothness,
however, that might be a different story because headers and
a loud exhaust may give you the impression of roughness without the
vibrations of a rough idle.

Invest the money (<$100) to have the car inspected by a shop familiar with
the LT-1, then there's a lot less likelihood of having buyer's remorse.

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