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SUV has problem getting up to 30 40 mph

Tiny
MJWSR
  • MEMBER
  • 2000 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 350,000 MILES
Hard to get vehicle to go, can be turned off and restarted to go for a bit, then struggle to go.
Took to nearby rpm shop, they say it's the transmission.
I drove recently over 50 miles around town and on freeway, no signs of transmission problems.
I had front end alignment done maybe 1,500 to 2,000 miles ago, the mechanic drove it around to check on front end, no problems in transmission then were noticed.

I suspect the catalytic converter.
Rpm says that's not the problem.

My grandson drives it daily on interstate highway 60 miles round trip to school.
Was driving it.
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Monday, January 6th, 2020 AT 1:15 PM

1 Reply

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

Yes, it could be but needs to be tested to confirm.

A back pressure test will confirm if the catalytic converters are clogged. You remove the O2 sensor and insert the gauge. If it read above 1 pound, the catalytic converter is clogged not allowing the engine to breathe.

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

Roy

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Monday, January 6th, 2020 AT 2:21 PM

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