Low engine power?

Welcome to 2CarPros.

Anytime a catalytic converter is partially plugged, it can cause power loss. Have you tried removing the O2 sensors to see if that is the possible issue? Take a look through this link.

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

As far as the crankshaft position sensor relearn, anytime an engine is replaced, it has to be done. And yes, that could be part of the problem.

Here are the directions:

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CRANKSHAFT POSITION SYSTEM VARIATION LEARN
Crankshaft Position System Variation Learn

Note: The Crankshaft Position System Variation Learn procedure is also required when the following service procedures have been performed, regardless of whether DTC P0315 is set:

* An engine replacement

* A engine control module (ECM) replacement

* A crankshaft balancer replacement

* A crankshaft replacement

* A crankshaft position sensor replacement

* Any engine repairs which disturb the crankshaft to crankshaft position sensor relationship.

Note: The ECM monitors certain component signals to determine if all the conditions are met to continue with the crankshaft position System Variation Learn Procedure. The scan tool only displays the condition that inhibits the procedure. The scan tool displays the signals of the following components:

* Crankshaft position sensors activity-If there is a crankshaft position sensor condition, refer to the applicable DTC that set.

* Camshaft position sensor signal activity-If there is a camshaft position sensor signal condition, refer to the applicable DTC that set.

* Engine coolant temperature (ECT)-If the engine coolant temperature is not warm enough, idle the engine until the engine coolant temperature reaches the correct temperature.

1. Install a scan tool.

2. Monitor the ECM for DTCs with a scan tool. If other DTCs are set, except DTC P0315, refer to Diagnostic Trouble Code (DTC) List - Vehicle See: A L L Diagnostic Trouble Codes ( DTC ) > Diagnostic Trouble Code Descriptions > Diagnostic Trouble Code (DTC) List - Vehicle for the applicable DTC that set.

3. With a scan tool, select the Crankshaft Position System Variation Learn Procedure and perform the following:

1. Block drive wheels.

2. Set parking brake.

3. DO NOT apply brake pedal.

4. Cycle ignition from OFF to ON.

5. Apply and hold brake pedal for the duration of the procedure.

6. Start and idle engine.

7. Turn the air conditioning (A/C) OFF.

8. The vehicle must remain in Park or Neutral.

Note: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine responds to throttle position after the learn procedure is complete.

9. Accelerate to wide open throttle (WOT) and release when the fuel cut-off occurs.

4. The scan tool displays Learn Status: Learned this Ignition. If the scan tool indicates that DTC P0315 ran and passed, the crankshaft position variation learn procedure is complete. If the scan tool indicates DTC P0315 failed or did not run, or another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle See: A L L Diagnostic Trouble Codes ( DTC ) > Diagnostic Trouble Code Descriptions > Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.

5. Once the learn procedure has successfully completed, and in order to store the crankshaft position system variation values in the ECM, turn OFF the ignition and verify all vehicle systems are OFF. This may take up to two minutes.
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Try that and let me know if it helps.

Joe

Let me know what you find. As far as the timing, that's not unexpected. Also, since you have a live data scanner, can you let me know what the fuel trims are running at, both short and long term?

Take care and I'll watch for your reply.

Joe

Welcome back:

That's it. The P0420 indicated a faulty converter. I'm glad to hear they got it figured for you. I'll keep my fingers crossed for you. Let me know how it's running.

Take care,
Joe

Hi WILLPAT100,

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Have a great weekend!

Renee
Admin

Happy to help.

Take care,
Joe

It sounds like the car is in limp in mode with means there is an issue with the transmission/engine traction control. This guide can help us fix it

https://www.2carpros.com/articles/engine-has-low-power-output

Please run down this guide and report back.

Hi,

That sounds like a fuel pump issue. Has the check engine light been staying on when the engine is running? If it is, the next step is to get the computer scanned for diagnostic trouble codes. Here is a quick video showing how it's done:

https://youtu.be/YV3TRZwer8k

I realize most people don't own a scanner, but often times a parts store will do it free of charge. So, if the light is staying on, have that done and let me know what codes are found.

Now, if the light isn't on, then we need to move to the next thing, fuel pressure. Here is a link that shows how to check it:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Here are the manufacturer's specs for pressure:

Fuel Pressure (Key ON, Engine OFF) .................... 384-425 kPa (56-62 psi)

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Let me know what you find or if you have questions.

Take care,
Joe

Hi,

Okay, then we need to check fuel pressure. Low fuel pressure can cause what you described. Let me know if you need help or have questions.

Take care,
Joe

Hi,

I doubt it is the transmission. If the transmission was causing this, chances are the engine RPM's would increase when it slows down indicating slippage.

Hi,

If the RPM's are increasing but the vehicle slows down, then it does sound like it could be transmission related and is slipping. Have you checked the transmission fluid level and condition? If you look at pics 1 and 2, it explains what to do.

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Let me know.

Joe