Question about 1998 Cadillac Seville

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When driving the engine runs hot, replace spark plugs because of misfiring due to overhead and sparks plugs just started back misfiring had radiator flush refill with dexcool and have replace a thermostat but stills run hot

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Suggest you look on the drivers side of the engine in the front, there is a black metal guard that covers a pulley that drives the water pump. Make sure the belt is not broken and that the water pump turns freely. Have the cooling system checked for exhaust gases, That is the way to check for blown head gaskets. Is there any coolant in the oil? The Northstar engine is designed to shut down cylinders one at a time to protect itself when overheating. Hope this will help you.

Posted on Sep 10, 2010


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Hi, recently my radiator cap came off (maybe I didn't screw it on tightly enough, girl strength) anyway the car started to rev (in a surge kind of way), I stopped at a gas station and left it for 30mins to...

Try replacing your spark plug wires. It is probably just misfiring, which will cause the engine to "surge" and then back off. This will repeat until the misfire is fixed. I would start with replacing the spark plug wires, and if you have any more problems, let me know. The radiator cap coming off would have eventually caused the engine to overheat, but it sounds like you didn't let it get that far. The spark plug wires may have gotten wet due to the radiator cap coming off, and now the spark plug wires are shorting out worse than they probably already were.

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The engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wire, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the the problems were faulty fuel injectors. 

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

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