1991 Dodge Ram failed emissions

Tiny
TADA
  • MEMBER
  • 1991 DODGE RAM
  • V8
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
I recently failed emissons the reading was NOx ppm too high. The tester suggested that I have my EGR cleaned and or replaced, however my repair shop said my cataliyc converter was bad and my muffler was loose. With a little reading I found that both issues could have cause my vehicle to fail emissions, but who's right?
Friday, June 13th, 2008 AT 6:50 PM

1 Reply

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
First need to manually engage the EGR valve with the engine idling, if it doesnt stumble real hard and almost stall the passages need to be cleaned, if it does it may be the cat. They both will affect Nox, but if the EGR isnt working properly, a cat wont be enough to fix it
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Sunday, June 15th, 2008 AT 8:55 AM

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