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Loss of power

Tiny
MICHAEL LECONA III
  • MEMBER
  • 2004 MITSUBISHI LANCER
  • 2.0L
  • 4 CYL
  • 2WD
  • MANUAL
  • 19,000 MILES
When I drive some times it jumps and will not accelerate. If I give it more gas and makes it worse. No check engine light is on. It actually has 190,000 miles on it.
Sunday, April 12th, 2020 AT 12:49 AM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I would do some basic checks first.

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

I would check the fuel pressure.

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

I would also do a cat converter test to be sure the catalytic converter is not clogged not allowing the engine to breathe.

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

Roy
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Sunday, April 12th, 2020 AT 2:09 AM
Tiny
MICHAEL LECONA III
  • MEMBER
  • 18 POSTS
How do I check the catalytic converter?
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Sunday, April 12th, 2020 AT 6:56 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You would need a back pressure gauge. You can get one at a parts store and remove the O2 sensor and install it. Start the engine and it will read a pressure. Anything greater than 1.5 pounds means it is clogged.

Otherwise, you could drop the head pipe to the exhaust manifold and then take it for a drive and see if it still has the issue.

Roy
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Sunday, April 12th, 2020 AT 7:02 AM
Tiny
MICHAEL LECONA III
  • MEMBER
  • 18 POSTS
Up upstream or downstream?
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Sunday, April 12th, 2020 AT 7:10 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Upstream sensor.

Roy
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Sunday, April 12th, 2020 AT 7:12 AM
Tiny
MICHAEL LECONA III
  • MEMBER
  • 18 POSTS
Someone told me that I can test it by taking the up stream o2 off to check it. Do you think it safe to do?
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Sunday, April 12th, 2020 AT 7:17 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
That is not enough of a leak to test the back pressure.

Dropping the pipe is the best way to test it. Or, get the gauge and put it in the upstream O2 sensor hole and measure the back pressure.

Roy
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Sunday, April 12th, 2020 AT 7:19 AM

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