Broke something in the engine?

[napkin]

I'm new to the world of cars and recently purchased a 91' Shelby Daytona 2.5L I think it is T1 and has the stock turbo. It was running like crap, plugs were bad, a plug wire was practically ripped in half, 2 vacuume hoses were disconnected. Got that all fixed and it ran pretty good but it was overboosting a lot. Romped on it a little which was dumb and then I heard a weird sound and the check engine light came on and it sort of stalled out. Makes kind of a weird grinding sound, but I was able to drive it the 1/6 of a mile home. My friend said he thinks I may have bent a valve stem. Engine isn't leaking any oil so didn't throw a rod through the engine or anything like that. What do you think happened? The stock boost gauge was a little past the max of 15psi and it was spinning wheels in 3rd so it much have been overboosting pretty bad. Do you think I need a new wastegate actuator?

[napkin]

Just drove it again, wont go higher than 3,000 RPMs and there is a huge loss in power, engine kind of sputters, but no check engine light and it does run. Something wrong with the valves?

[JDre]

Make sure all lines behind the engine are correct, leading to the solenoids, and check timing belt hasn't slipped, which could knock the cam and distributor out of time. I have no idea what is grinding. Wastegate actuator needs pressure applied to it to move, I rigged something with a bike tire pump to test it. You could see if it is seized.

[napkin]

I found a vacuum line going to the actuator that had broken, so hopefully that fixes the overboost problem. A friend I talked to thought that maybe I had blown the head gasket.

[JDre]

It is possible with that much boost. Check for exhaust in coolant, oil in coolant, loss of compression.

[big_P]

I think your timing may have jumped.

[raccoon]

i agree, check the timing, DDG- Quick and easy timing belt check

also do a compression test