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Re: 2002 Chevy Tahoe Oil Pressure
Oil pressure drops when rpm's drop to .well..zero...so no... oil pressure is a result not a cause likely....did you overheat it ? drive it to 107mph and have the rev limiter kick in? does it start and run now ?
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The oil light is not an indication of oil level; rather it is an indication of oil pressure. If the oil pressure is low enough to light the oil light, you should be hearing some rattling in the engine. Otherwise, it is possible that the oil pressure sending unit is defective. You are lucky if that is the case, because some vehicles are wired that if the oil pressure sensor indicates low pressure, the engine will shut down to protect itself. You should have the oil pressure checked with a mechanical gauge ASAP and take whatever corrective measures are necessary.
Newer cars use what is referred to as "Drive by Wire. Instead of a throttle cable that goes to the throttle body, there is a sensor on the gas pedal and another on the throttle body. The signal from the pedal is sent to the ECM, analyzed, and transmitted to the throttle body to perform the desired operation. If something in that chain breaks down, the car is disabled as a safety feature, so that you wouldn't have, say, a wide open throttle issue to deal with. That is what the "starting disabled, service throttle" means. As far as the oil light and low oil pressure indications, if the key is on, and the engine is not running, these are normal indications since there is no oil pressure in the engine when it is not running.
The oil light does not indicate the car is low on oil (based on your discription) it indicates the oil pressure is low, the no start is most likely due to this low pressure and the fuel pump has been cut off to prevent damage to the engine from low oil pressure. Please have a shop locate the cause of the low oil pressure warning and repair it as needed. It could be a false light or a real one, which means if you drove it very far you may have damaged the engines bearings.
did you install the oil pressure switch origional to the tahoe? The tahoe uses a low oil pressure shutdown, instead of an inertia switch to shut off the fuel pump in the event of an accident. If the pressure circuit does not close within 3 seconds after the engine starts the fuel pump shuts off. This is in case the truck is on its side or upside down the pump will shut off.