No power check engine on

KRATOS1988

MEMBER
2001 TOYOTA RAV4
2.0L
4 CYL
4WD
AUTOMATIC
200 MILES

Hello,
i have the vehicle listed above with 1azfe 2.0 engine.
I replaced all the parts in my engine after engine problems.
I tested first when it was standing. Every think was okay.
idle okay rpm goes up to 6,000 and sounds great.
when I got to the road and go over 2,000 rpm. The engine start to lose power. It is like I have an engine misfire or little fuel in the engine and the check engine comes on.
when I read the faults its was knock sensor and o2 sensor bank1 and o2 sensor bank 2.
i replaced the knock sensor and didn't fix the problem.
i read the faults again and it was the o2 sensors (no knock sensor fault).
i replaced the 2 o2 sensors with new Toyota sensors and I still have the same problem with o2 sensors fault.
i tried to go with no o2 sensors on my engine still no power but with no chick engine light this time.
i noticed something when the engine is cold it runs okay. When it get hot the problem comes on.

11 Replies

SCGRANTURISMO

CERTIFIED MECHANIC

Hello,

Do you have the upstream O2 sensor, by upstream I mean the one before the catalytic converter, closest to the engine in and hooked up?

Thanks,
Alex
2CarPros

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Saturday, July 27th, 2019 AT 4:56 AM

KRATOS1988

MEMBER

I change the 2 in the top and I still have a fault on them.
See the picture.
Thanks

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Sunday, July 28th, 2019 AT 12:39 AM

KRATOS1988

MEMBER

Hello again.
Thank you so much. I will try that and let you know.

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Tuesday, July 30th, 2019 AT 1:31 AM

KRATOS1988

MEMBER

Hello again,

so I check it and found that my o2 sensors was not good. I replaced them with new ones.
The problem now is the knock sensor fault, and still have the same problem no power and no torque.
Thanks

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Friday, August 2nd, 2019 AT 3:04 AM

SCGRANTURISMO

CERTIFIED MECHANIC

Hello again,

This could be a problem with your throttle body being dirty and your vehicle going into limp mode. Here are a few links for you to go to down below:

https://www.2carpros.com/articles/how-a-throttle-body-works
https://www.2carpros.com/articles/throttle-actuator-service
https://www.2carpros.com/articles/reduced-power-limp-mode

Please go through these guides and get back to us with what you can determine from your vehicle.

Thanks,
Alex
2CarPros

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Friday, August 2nd, 2019 AT 8:13 AM

KRATOS1988

MEMBER

Hello.
Thank you so much. Cleaning my throttle body helps too much and 90% of my engine power comes back. I still felling when I drive that the power comes and go (high rpm idle when driving) it is like something stops my car for a little then letting go all the time, in slow driving and fast driving.
Any ideas?
Thank you Alex

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Monday, August 5th, 2019 AT 1:58 PM

SCGRANTURISMO

CERTIFIED MECHANIC

Hello again,

I would do a Keep Alive Memory (KAM) relearn of your Power-train Control Module (PCM) by unhooking the negative battery cable for at least 5 minutes. This will wipe the KAM of the PCM clean. Then I have included the relearn procedure for your vehicle's Idle Air Control (IAC) Valve in the diagrams down below. Follow the guide and drive your car normally. It should relearn itself, but this time with a clean throttle and throttle body.

Thanks,
Alex
2CarPros

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