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the biggest problem these engines have is lower intake manifold gasket failure. this is because gm used nylon gaskets and the anti-freeze eats away at the gasket as the antifreeze gets older. LIM gasket service life can be extended by flushing your cooling system every 2 years and keeping up with cooling system maintenance.

another thing i have heard is they have head gasket problems. now i don't really believe this because my mom's boyfriend has own you Buick Skylarks with this engine and I now own a 95 Chevy Corsica with that engine as well. One Buick had 138,000 miles before we got rid of it and the other had 195,000. Both of those engines had the original head gaskets in them. my corsica only has 44,000 miles on it so i can't say much about it yet. but i can say that head gasket failure can be avoided by maintaining your cooling system as i stated earlier and if the car starts to run hot pull it over before it actually over heats. i replaced the oem 195* thermostat with a 185* thermostat to reduce the engine operating temps in my Corsica.

And one more problem that alot of GM's have is piston slap. there is a website out there called www.pistonslap.com that says that piston slap is this terrible thing and all that, its really not. remember the 195,000 mile Buick I talked about? it had it since it was bought at 60,000 miles and it ran fine at the high miles. piston slap really is harmless, its just a noise.

so if you keep up with the cooling system maintenance and the car your looking to buy has already had the LIM gaskets replaced...the engine is a fantastic engine. i love my Corsica that has it and I loved driving the Buick's too. It really has some get up and go.

Head gaskets and intake gaskets are to of the big problems with the 3100 but their is also the problem of the camshaft breaking

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Q: What are the potential problems of a 3100 GM engine?
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