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Extreme power loss. Engine tries to make power, even pushes

Customer Question
rpm s to 4000 yet...
extreme power loss. Engine tries to make power, even pushes rpm s to 4000 yet car wont go. Engine light came on with po420 code popping up then light went out. Changed plugs and mass airflow sensor, changed cat and upstream o2 sensor last year.
Submitted: 2 years ago.Category: Toyota
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Answered in 14 minutes by:
10/31/2015
Toyota Mechanic: Amedee, Toyota Technician replied 2 years ago
Amedee
Amedee, Toyota Technician
Category: Toyota
Satisfied Customers: 26,802
Experience: ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector
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Hello and welcome! My name is ***** ***** I can assist you with your question. What is the engine vacuum at idle and at 2500 rpm?

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Customer reply replied 2 years ago
I have no idea- have no way to check it right now
Toyota Mechanic: Amedee, Toyota Technician replied 2 years ago

Ok, no problem. I can wait until you run this test and report back. It does not have to be done today. I will be looking forward to your reply.

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Customer reply replied 2 years ago
Not sure if i can do the test today. But took it for a ride yesterday and after a few minutes it couldnt get out of its own way. Put my foot to the floor and it wouldnt even get above 25 on a hill. Kind of hard to explain- no check engine light came on. And I dont think I mentioned that the car just rolled over 200,000 miles and has been running fine till then. I would think that if something like an intake leak was there it would set off a code- someone mentioned that last night.
Toyota Mechanic: Amedee, Toyota Technician replied 2 years ago

Hello! I understand what your trying to explain to me. I have experienced this many many times and I am very good at diagnosing this sort of issue. Was the muffler replaced? If not that can cause this issue as well if it is plugged up. There is no code for "Plugged muffler"

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Amedee
Amedee, Toyota Technician
Category: Toyota
Satisfied Customers: 26,802
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Experience: ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector

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