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What is the average engine temp of a 1991 olds 98 car gets up to about 204 degree and die wont start until its cooled off?

A normal operating temperature for a 1991 Oldsmobile 98, or most cars for that matter, is between 195-220°F (90-104°C). 204°F is within that range, so it's not necessarily *too* hot on its own.

However, the fact that the car dies and won't restart until it cools down strongly suggests a problem, and not simply a high average temperature. This points to a component failing when it gets hot, likely related to the ignition system or fuel delivery. Possible causes include:

* Ignition system failure: The ignition coil, ignition module, or crankshaft position sensor can malfunction when they get hot. This is common.

* Fuel pump failure: A weak fuel pump might not be able to maintain pressure when hot.

* Temperature sensor issues: An inaccurate temperature sensor could be causing the computer to make incorrect adjustments, leading to the engine shutting down as a protective measure. The sensor itself might fail when hot.

* Coolant leaks: While your temperature seems within range, a slow coolant leak can still cause overheating if the system isn't able to maintain proper pressure, leading to a system failure elsewhere.

* Electrical connections: Poor connections, corrosion, or loose wiring can worsen when hot, leading to intermittent failures.

You should not continue to drive the car. Further driving could cause significant damage. You need a mechanic to diagnose the problem. The fact that it's failing when hot points to a heat-related component failure, and delaying diagnosis could exacerbate the problem and lead to expensive repairs.