El Problema no esta en el termostato, es el sensor de Temperatura. Cambiarlo es muy Facil Pero Tiene Que desconectar la Bateria y luego el conector del sensor de aire (sensor de flujo de aire), Una Vez Que Haya lo Instalado, conecte el enchufe del sensor de flujo de aire y Despues La Bateria. La ECU reconocera de Inmediato el Cambio.
Its normal enough, but the coolant temp., sensor should have been replaced as well, was this done ? this sensor is critical to engine performance, air/ fuel mixture & idle, while engine warms up, it may also turn on rad fans, all the engine sensors work together to make sure engine performs as required. it doesn't just take temperature.
SOURCE: 2005 colorado 5 cyl auto
If the idling above 2500 occurs when the gears is engaged without any pressure on the gas, the issue could be just isolated in the transmission.
The first one that needs to be checked is the fluids. Check of the level is good and if it needs replacing. Oil is usually affected by heat and any dirt affects the internal components such as solenoids or the gear valves. When the transmission is at 'D' the computer decides on when to change gears. If contamination occurred, the solenoid may need cleaning.
Check for other symptoms such as inaccurate or erratic speedometer. It could be a bad velocity sensor.
Other than that it could be the PCM. I would suggest to inspect the wiring that goes from the transmission. Check for loose connections. If you can have a scanner connected to the car. Errors may be saved in the computer without the check engine light turning on. Some shops would let you borrow their scanners. The error would accurately identify the problem.
SOURCE: How many miles before I need to replace the auto
usually around 30,000 miles or more frequently if vehicle is towing things.
SOURCE: My 2001 Chevy S10 truck
Are you sure the coolant isn't heating up? I had the same issue once and the problem was i hadn't opened the high point vent on the cooling system. there for no liquid was getting to the sensor ie. it wasn't reading the true temp of the coolant. If that's not it try pulling the sensor out get enough slack in the wiring so you can get the sensor into a small pan of water. put scalding hot/boiling water in the pan have someone watch the guage put the business end of the sensor into the water and see if your temp rises. If not you were ether given the wrong sensor or a defective one.
SOURCE: check engine light on 2005 chevy colorado code p1133
This code is for insufficient switching of the oxygen sensor. Make sure you don't have any other codes, misfires, vacuum leaks and/or exhaust leaks as these will affect O2 readings. Here is some more info I found on the web. http://m.engine-light-help.com/?url=http%3A%2F%2Fwww.engine-light-help.com%2Fgm-trouble-codes.html#3331
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