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Re: Engine vibration from about 2000 up.
Lothos #810134 January 26th 2024 7:28 am
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Both of my 454's like a +4 on the timing...


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Engine vibration from about 2000 up.
Lothos #810852 February 14th 2024 12:46 am
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I'm still trying to rack my brain on this. I've been working this week, so I havent tinketed as much as I would have liked since my ankle gave me trouble.

But I'm doing some thinking. any chance on the van having a clogged cat? Its one of the small aftermarket ones thats been patched into place. I'm trying to find out why I am getting 9 mpg, unloaded, and I drive very conservatively. Everything I've read says that I should be getting mid teens, and even frscke1 claims 13 from his 454's. Cat would explain the poor fuel mileage and 20 seconds to 60 seems slow even for a 5,000 lb van.

Barring that, I'm buying a compression gauge since I think mine is 600 miles away and I'm begining to suspect the worse.

Re: Engine vibration from about 2000 up.
Lothos #810853 February 14th 2024 12:53 am
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No air thru no Hp out the back ...A clogged cat can kill a motor !


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Engine vibration from about 2000 up.
Lothos #810857 February 14th 2024 4:42 am
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Sounds like your Cat is a Dog!


79 chevy G30 cobra camper conversion.
[Linked Image]
Re: Engine vibration from about 2000 up.
Lothos #810860 February 14th 2024 11:05 am
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Look on the bright side a clogged cat gives you a louder intake note.

Re: Engine vibration from about 2000 up.
Lothos #810865 February 14th 2024 11:29 am
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I am in Nashville Lothos...I know an exhaust guy.lol

Re: Engine vibration from about 2000 up.
Lothos #810866 February 14th 2024 11:31 am
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If the cat is is bad Monteagle will let you know, bad cat causes a fuel distribution problem .

Re: Engine vibration from about 2000 up.
Lothos #810869 February 14th 2024 2:25 pm
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Well, now that you mention it, I am in need of a replacement exhaust. The factory Y pipe is notoriously restrictive, and the tail pipe is rusting out in several places.

Duals wouldnt be the worst thing to happen. And maybe if someone other than myself looked at this van, they could provide some insight.

Last edited by Lothos; February 14th 2024 2:27 pm.
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