1993 Saturn SL2 Loud knocking Engine

Start the engine up while it's knocking take one plug wire off the spark plug at a time then put it back on.If the noise stop's then you have the knocking coming from the bottom end.If that's the case the most cost effective repair would be to replace the engine.

[quote:42459f153d="djcornett"]Engine Performance problem
1993 Saturn SL2 4 cyl Two Wheel Drive Automatic 100000 miles

Car hasnt been driven for 2 years. Was running fine when parked. Took to shop and there's a loud knocking in the engine that doesn't stop. They want to put in a new engine (cost $1500.00) Are there other things that it coud be? Would it be more cost effective to just put the in a new engine?[/quote:42459f153d]

My guess ... you didn't drain the fuel/use stabil, and the fuel broke down in the tank. Next time you store a car that long, use stabil, and ask around for other recommendations as far as what to do to prevent damage.

[quote:34f0919274="saturntech9"]Start the engine up while it's knocking take one plug wire off the spark plug at a time then put it back on.If the noise stop's then you have the knocking coming from the bottom end.If that's the case the most cost effective repair would be to replace the engine.[/quote:34f0919274]

So, if the noise doesn't stop and it isn't from the bottom end what would that mean if not a new engine?

If it doesn't stop from pulling off the spark plug wire's it's most likely not from the bottom end of the engine.Then you would have to take a long screwdriver and place it around different part's of the engine and listen to where it's coming from and go from there.

[quote:ddaf86a783="djcornett"][quote:ddaf86a783="saturntech9"]Start the engine up while it's knocking take one plug wire off the spark plug at a time then put it back on.If the noise stop's then you have the knocking coming from the bottom end.If that's the case the most cost effective repair would be to replace the engine.[/quote:ddaf86a783]

So, if the noise doesn't stop and it isn't from the bottom end what would that mean if not a new engine?[/quote:ddaf86a783]

Could be knock on all cylinders, or coming from another internal engine component. Might not, but I'm still betting on engine knock.