Poor MPG had loss of power

Tiny
TONIA HAMM
  • MEMBER
  • 1990 CADILLAC DEVILLE
  • 4.5L
  • V8
  • FWD
  • AUTOMATIC
  • 8,000 MILES
When I got it about a year ago it had been sitting for five years one year ago we put new plugs wires and oil change fuel flier and put a pipe though the catalytic converter because it had loss of power and poor mileage and now it has no power. It is in the road because we have been trying to fix it and it does not have the power to pull its self. Please helpful.
Sunday, August 6th, 2017 AT 12:42 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Hello,

It sounds like it could be one of two things; first the ignition timing could be off causing the low power. Next it could be old gas which will never allow the engine to run right.

Here is a guide that can help as well:

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

and

https://www.2carpros.com/articles/symptoms-of-low-engine-power

Please let us know what you find.

Cheers, Ken

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Monday, August 7th, 2017 AT 3:17 PM

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