runs rough and there is no power and oil light is on and check engine is on?

2004 CADILLAC CTS
800,000 MILES
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FERID1977
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i have a 2004 cadillac cts i replaced the engine and the cars runs and drives but runs rough and there is no power and oil light is on and check engine is on.
Jul 24, 2011 at 12:55 AM
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SQM
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Hello,

An engine can have low power output due to a number of reasons. It could be for having a clogged air filter, weak fuel pump, worn mass air flow sensor. One of the most common reasons for low power is a dirty throttle actuator.
Over time dirt and derbies will build up inside the throttle actuator and that will make the sensor send incorrect data to the ECM. Which can trigger a low power mode.

https://www.2carpros.com/articles/reduced-power-limp-mode

Many times cleaning out the throttle body can improve the drivability and restore the power.

https://www.2carpros.com/articles/throttle-actuator-service

Since the engine light is illuminated, it will be a good idea to scan the vehicle and retrieve the code(s). Knowing the codes can help with the diagnostics.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.
Dec 16, 2021 at 8:00 PM