My Oldsmobile Starfire starts up but doesn't stay running. What could be the problem?
If your Oldsmobile Starfire starts just fine but doesn't want to stay running, then there might be a problem with the engine temperature sensor. When your car's engine is started cold, this component sends a signal to the DME control unit to provide a richer mixture. If the engine temperature sensor is faulty, it sends an inaccurate temperature signal to the control unit. This component then leans the fuel mixture, thinking that the engine is at normal operating temperature, causing the engine to run rough. To confirm that the problem is indeed the engine temperature sensor, you might need to run your car through an emissions test. If you fail, then it's most likely caused by a broken sensor. You should also check for a leaking coolant in case this has caused the engine temperature sensor to behave erratically. It is also possible that the check engine light is illuminated when this happens; if so, then you must take your car to a qualified mechanic so they could diagnose the problem properly.
My Oldsmobile Starfire has always run hot ever since I got it, which leads it to overheat rather quickly. What could be causing this?
First, check if your car is also constantly losing coolant. If so, then there might be a leakage in your cooling system, particularly in the vacuum lines. But first, check the pressure cap. The gasket on the cap deteriorates over time, letting pressure escape, which in turn causes the cooling system to malfunction and your car's engine to overheat. You should also check if the electric cooling fan is coming on. To fix this, repair or replace the fan and the wiring, and replace the cooling fan temperature sensor. It is also possible that your car's overheating problem doesn't have anything to do with the cooling system at all. It could also be due to late timing caused by a malfunctioning ignition system, a plugged radiator, a slipping accessory belt, a collapsing bottom radiator hose, and even low oil level. Simply inspect these possible problem components and replace any faulty parts you find.
The 394 HP engine of my Oldsmobile Starfire is on its last leg. Is it still worth saving or should I look for another engine to replace it?
The best option you have is to rebuild the engine. There are still a lot of rebuild kits and parts for both the engine and transmission that are readily available on the market. You might want to hire a competent machinist to do this. Also, find an advanced curve, a properly jetted carburetor, and optimum gears for the application, and you should have an engine that feels good as new. Should you want to install a new, bigger engine, you might have to fabricate new brackets to match the engine mounts, as well as a new cross member to match the previous mount at the rear of the transmission. You might also have to shorten the drive shaft and change the yoke. If possible, move the radiator outlet to the right side so that a bigger engine can fit.