is200 Is200 down on power

[Jhandy]

Hi

I have a Lexus Is200 down on power

the lambda sensor was giving a fault so I put in a second hand one it was still giving a fault so I bought a brand new one. Was still giving fault so I assumed the cat was blocked, I then changed the cat and car struggled to start so I disconnect the new cat still wouldn’t start. I then changed the fuel pump and spark plugs car still wouldn’t start. I eventually toed the car and rolling started it. It started and haven’t had an issue with starting it ever since but is very down on power struggles to get up a hill. I changed the coil packs, injectors, throttle body, disconnected the lambda sensors, changed the map sensor changed the air filter.. I’m running out of ideas any help is appreciated. Only fault that comes up on the system is the lambda sensor 

[jbi507]

Have you checked your clutch doesn't need changing? 

After 11 years of ownership of my is200, I noticed acceleration was no longer the same and then as time went on I could feel the biting point was much sooner. 

After it was replaced it was prefect. 

[Jhandy]

I got it sorted after was the cam tensioner was wore and had timing off slightly.. just put new belt and tensioner in and she’s flying it now 

[Robbins.Is200.mk51]

My auto is200 is hit and miss with power what should i try first?.

[Mihanicos]

Check the wiring including the connector from the lamda sensor. Follow the wiring and look for short or open ciruit. If you have the circuit diagram, check that the output of the sensor reaches its destination. 

This sensor monitors the air to fuel ratio and continuously adjusts the amount of fuel injected to the engine. For peak performance, it is important the engine ecu reads the lamda sensor.

Chris.