Question about 2004 Toyota RAV4

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Hi! i have a rav4 2002 model 4x4 2.0,when the engine is still not hot it goes smooth running and when the temperature go up in the middle gauge level the car started to bump in, bump in while im on the 2nd gear to the 3rd & 4th gears and continues on and on you can't accelate the gas straight away cause of this problems please help, thanks in advance...

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2 possible origins for your problem:
1 - the fuel/air mixture in your engine is not correctly done at higher temperatures - it's too lean - so the engine lacks torque so it stumbles when gearshifting occurs. This can be caused either by a bad temperature sensor or by a failing fuel pump (or pressure regulator). To identify the failing part you will have to connect the car to a diagnostic machine and retrieve the error codes.
But it's much more likely that it's this
2 - the transmission oil has aged and its characteristics have degraded so much that it's no longer doing its job when heated. You will have to replace it immediately - the transmission will be severely damaged if you continue to use it as is.

Posted on Mar 25, 2011

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