Hi and thanks for using 2CarPros.
This can be a couple different things. For example, a weak fuel pump, a plugged catalytic converter, and many other things.
If the check engine light stays on when the engine is running, I suggest having the computer scanned for diagnostic trouble codes. Here is a quick video that shows how it is done:
I realize most people don't own a scanner, but most times a parts store will check it for free. If the light is on all the time, have that done and let me know the codes which are found. If you find a P0420 as one of the diagnostic trouble codes, then my next suggest becomes very relevant.
Next, and after reading your post, my first suspect is a partially plugged catalytic converter. Take a look through this link:
Here is a link that shows how to test a converter:
Try these things first. If you find the converter is bad, here are the directions for replacement. The attached pictures correlate with these directions.
CATALYTIC CONVERTER REPLACEMENT
The three way catalytic converter is serviced by replacing the entire assembly. Always replace the gasket at the front flange when servicing the three way catalytic converter. Never reinstall the original gasket.
1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
2. Disconnect the heated oxygen sensor electrical connector.
3. Remove the exhaust manifold pipe stud nuts.
4. Remove the catalytic converter bolts.
5. Remove the three way catalytic converter.
6. Remove the heated oxygen sensor. Refer to Heated Oxygen Sensor (H02S) Replacement (H02SI) or Heated Oxygen Sensor (HO2S) Replacement (H02S2) in Computers and Controls.
1. Install the heated oxygen sensor. Refer to Heated Oxygen Sensor (HO25) Replacement (H02S1) or Heated Oxygen Sensor (HO2S) Replacement (H02S2) in Computers and Controls.
2. Install a new exhaust manifold pipe gasket.
Notice: Refer to Catalytic Converter Movement Notice in Service Precautions.
3. Install and support the three way catalytic converter.
4. Install the catalytic converter bolts.
Notice: Refer to Fastener Notice in Service Precautions.
5. Install the exhaust manifold pipe stud nuts.
- Tighten the exhaust manifold pipe stud nuts to 32 Nm (24 ft. lbs.).
- Tighten the catalytic converter bolts to 45 Nm (33 ft. lbs.).
6. Connect the heated oxygen sensor electrical connector.
7. Inspect for leaks and underbody contact.
8. Lower the vehicle.
Let me know if this helps or if you have other questions.
Images (Click to enlarge)
Thursday, September 17th, 2020 AT 11:50 AM