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1999 Chevy Suburban ceeps loosing power until stalls

Tiny
JOSEPHRHODA
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
Engine Performance problem
1999 Chevy Suburban V8 Four Wheel Drive Automatic 107k miles

Truck runs great when cold. After normal temp and driving on freeway for five or 10 min. You start losing power. And keeps getting worse. Map sen. Has a reading of 1.8 on high side so put new and no change. Checked cat. Converters w/ camera and they to look good.
? What is my problem? Im stuck on this one.
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Tuesday, August 11th, 2009 AT 12:07 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,740 POSTS
Has the check engine light come on? Has the fuel pressire been tested? Even if the converters look good, check them by running the vehicle to get it hot and check them to see if they are glowing red hot.

Here is a how to for checking fuel pressure:

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

Let me know what you find.
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Wednesday, August 12th, 2009 AT 6:00 PM

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