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98 Jimmy, trouble code PO404, replaced EGR, still not fixed

Tiny
SGGRIFFEY
  • MEMBER
  • 1998 GMC JIMMY
98 jimmy, 4wd, bucks and jumps, just started doing it, not gradual. Nothing changed after replacing EGR valve.
Any other ideas?
Tuesday, September 18th, 2007 AT 3:06 PM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
I'll see if I can help, now what engine and Jimmy are we dealin with? S or K?
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Tuesday, September 18th, 2007 AT 3:43 PM
Tiny
SGGRIFFEY
  • MEMBER
  • 2 POSTS
Just got a reply from another site. I was told the catalytic was possibly melted together causing back pressure. I removed the O2 sensors in front of the catalytic and it drove great (just loud). I'm on my way to replace the catalytic converter right now!
Thanks!
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Tuesday, September 18th, 2007 AT 4:15 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Have a nice day, but any codes? We don't want to wreck another converter do we? This will happen when the check engine light is flashing.
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Tuesday, September 18th, 2007 AT 6:00 PM

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