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Car losing power

Tiny
MGM11
  • MEMBER
  • 2011 MERCURY MARQUIS
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
Hello,

My car lunches pretty good and drives fresh until I reach twenty km/h or so. Then the car starts to drive slower. The car feels strong but drives slow. At 1500 rpm I used to reach ninety km/h. Now I cannot get to seventy km/h with 1500 rpm. I changed fuel filter 6,000 miles ago. I changed spark plugs and cleaned the throttle body. The intake filter is clean. There is a tiny unstable vibration feeling on the car chassis. Fuel injectors are working. And I cannot seem to find out why is this happening. P.S there is no check engine light.

Regards,
Hani
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Monday, April 2nd, 2018 AT 9:36 PM

1 Reply

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

It sounds like you have a clogged catalytic converter. When the engine cannot breathe from a restriction, it will not produce power.

A shop can confirm by doing a back pressure test by removing the O2 sensor and inserting a gauge into the hole and measuring that pressure.

Roy
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Tuesday, April 3rd, 2018 AT 4:22 AM

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