92 Camaro RS 5.0 failed CA emissions, NO PPM too high

Hello, 92 Camaro, 141K miles, 5.0 V8. Throttle Body, NO PPM @15 mph max 772, ave 237 Meas was 871. Never failed smog in 12 years. Recently replaced EGR valve, the
diagnostic code showed egr failure. No other codes are present. The HC was pretty close, Max is 110 and Meas was 109. Car was totally warmed up. Any suggestions as to how to make it pass smog?
Thanks.
D.
--
http://www.AutoForumz.com/ This article was posted by author's request
Articles individually checked for conformance to usenet standards
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
"D" wrote: > Hello, > 92 Camaro, 141K miles, 5.0 V8. Throttle Body, NO PPM @15 mph > max 772, ave 237 Meas was 871. > Never failed smog in 12 years. Recently replaced EGR valve, > the diagnostic code showed egr failure. No other codes are > present. > The HC was pretty close, Max is 110 and Meas was 109. > Car was totally warmed up. > Any suggestions as to how to make it pass smog? > > Thanks. > > D.
The timing was off. S/B 0 degrees and it was at 3 or 4. Adjusted the timing and the NOx fell within range. So there you go.
--
http://www.AutoForumz.com/ This article was posted by author's request
Articles individually checked for conformance to usenet standards
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Hmmm,
Sounds familiar. I offer few suggestions.
1. ChaNGE THE OIL - believe it or not this helps more than you'll ever know
2. PUT HIGH OCTANE FUEL IN IT- this will inerently lean out the mix
3. CHANGE THE EGR AGAIN - you could have gotten a bum valve
4. CHECK YOUR CAT, IT'S PROBABLY TOAST - check for "carsound" cats, they are around 60 bucks.
5. If you hear noisy valves, they may not be closing all the way. Could be cam or burnt valves. Passenger side tends to go first. A clue is if you are adding water a lot. If you are, it is time for a valve job. My 90 is in the shop right now for it. That is 2400 out the door.
Good luck
Jim
mph max 772,

http://www.AutoForumz.com/Camaro-92-RS-failed-CA-emissions-PPM-high-ftopict71285.html
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.