Question about 1991 Toyota Corolla

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I have a Toyota Corolla/91 1.6 L 4 cyl. DX When I start the car run but does not has power. I changed or replaced the fuel filter, air filter, sparks plug, check up the battery, alternator, fuel regulator for injectors and transmission. How I said before the car start but does not has power to run. Please, help me!.

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Check that the ignition timing is set correctly. Use a timing light and set the timing to 10 deg Before Top Dead Center (BTDC). Check the fuel pump pressure output. If you still lack power, it could be that the exhaust system is restricted.

One test you can do is to remove the oxygen sensor. With the sensor removed, start and run the car. The exhaust will be loud with the sensor removed, but see if the engine's power is improved. If it has greatly improved power, the exhaust pipe has a restriction. A very common restriction is that the catalytic converter is internally damaged. Changing the catalytic converter will be necessary if this is the problem. The internal honeycomb of the converter can melt down and turn to **** or it can break down into a coarse sandy substance that can clog the converter exit.

Posted on Apr 01, 2011

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PLEASE NOTE: This can be a real exercise in frustration, as the filter and the threads from the fuel pipe usually lock themselves together. Removing the filter almost always destroys the threads, on the fuel delivery tube, and you may have to replace the fuel line to the tank. I am telling you this up front so if and when you remove the filter, you can expect a 96% chance of needing to replace the fuel line to the tank.

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