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· Registered
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Discussion Starter · #1 ·

I have a 1995 4X4 3500 Long Bed Crew Cab Silverado with the 7.4 engine. The way this baby drinks gas you'd think it was Budweiser.
Does anyone know of an after marker device that will mimic Chevy's AFM system? Can the engine be programed to switch from 8cyl. to 4cyl.?
I know there are plenty of devices that will increase the performance but are there any that will significantly increase fuel economy.
Cadillac had a 4-6-8 system a while back, I wonder if someone could figure out a way to get one off a junker and modify it for our beasts?

· Premium Member
1,786 Posts
That old Caddy system sucked, from what I heard they had more trouble with it than any other system they ever used.

You would be hard pressed to fined one that works in a bone yard so I wouldn’t even attempt it.

Give it a full tune up.

You have GM’s biggest motor available, did you think it would get good mileage?

Sorry but just what is bad mileage?

The AFM system would be your best bet, but you will have to change motors I believe to do that.
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