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Username Post: Failed smog high NOX        (Topic#280137)
72novadrvr 
Forum Newbie
Posts: 5
72novadrvr
Reg: 04-23-12
04-23-12 07:48 PM - Post#2218476    

Failed smog check today. Truck had a small fire from previous owner was told everything replaced. Noticed when I got home the EGR Solenoid was slightly melted and no vac line to EGR. Pushed egr and truck wants to stall. Replaced vac line to EGR and engine light came on and truck stalled. Replaced the solenoid and no engine light. (cleared light by disconnecting battery for a few mins)

Truck ran these numbers

15MPH
CO2% 15 - pass
%O2 .3 - pass
HC (ppm) 43 - pass
CO (%) .16 -pass
NO (ppm) 1115 - fail

25MPH
CO2% 15 - pass
%O2 .2 - pass
HC (ppm) 4 - pass
CO (%) .07 -pass
NO (ppm) 774 - fail

Do you think with new solenoid and egr actually hooked up it will pass now?
72 Nova 350, 700R4
94 Silverado 5.7L 2WD


 
someotherguy 
Moderator
Posts: 25143
someotherguy
Age: 43
Loc: Texas
Reg: 08-01-03
04-24-12 01:38 AM - Post#2218539    
    In response to 72novadrvr

Welcome to Chevytalk,

New EGR and solenoid certainly can't hurt - just be sure to buy quality brand parts, not the generic one-size-fits-many stuff. The TBI engines (assuming you're a TBI 5.7 or 5.0 since it's got a vacuum EGR) are very picky about the valve. Suggest strongly you get AC Delco or Delphi only. Check our FAQ post at the top of the forum for more info - including proper connection of the vacuum lines. One port on the solenoid is a vent and meant to be open.

Richard
94 C2500LD / 94 C1500 / 06 300C SRT8
Check out my truck shop projects


 
navygunner08 
"2nd Year" Silver Supporting Member
Posts: 758
navygunner08
Loc: Norfolk, VA
Reg: 02-13-11
04-24-12 05:52 AM - Post#2218572    
    In response to someotherguy

What is the operating temperature at?
1994 K1500 Z-71


 
72novadrvr 
Forum Newbie
Posts: 5
72novadrvr
Reg: 04-23-12
04-24-12 09:20 AM - Post#2218637    
    In response to navygunner08

Yeah solenoid on there the vent line was melted closed. Maybe why it kicked a engine code when I hooked it up.

New solenoid is a direct fit Borg-Warner. Called around and no Delphi. But I trust BW from past trucks and cars I have had.

Purrs like a kitten and doesnt get over 200. Thermo kicks in and brings it back down.

Going for a pre test in a bit. Gonna run it around and idle for a while to heat the cat up.
72 Nova 350, 700R4
94 Silverado 5.7L 2WD


Edited by 72novadrvr on 04-24-12 09:22 AM. Reason for edit: No reason given.

 
someotherguy 
Moderator
Posts: 25143
someotherguy
Age: 43
Loc: Texas
Reg: 08-01-03
04-24-12 12:22 PM - Post#2218682    
    In response to 72novadrvr

An inoperative EGR can definitely cause high NOx due to higher combustion chamber temperatures, so if you've got it working now, you stand a chance to pass. Let us know how you do...

Richard
94 C2500LD / 94 C1500 / 06 300C SRT8
Check out my truck shop projects


 
72novadrvr 
Forum Newbie
Posts: 5
72novadrvr
Reg: 04-23-12
04-26-12 04:30 PM - Post#2219450    
    In response to someotherguy

Passed with flying colors.


Side note had my drvr side caliper stick on the way there. Brand new caliper, pads, rotor. Got home after smog lucky only 2 miles away. Jacked it up pumped the brakes and shut off truck opened bleeder valve and fluid shot out. Replaced brake hose and all good now. Going repack the bearings (brand new as well) since they got hot.
72 Nova 350, 700R4
94 Silverado 5.7L 2WD


 
someotherguy 
Moderator
Posts: 25143
someotherguy
Age: 43
Loc: Texas
Reg: 08-01-03
04-27-12 07:25 AM - Post#2219635    
    In response to 72novadrvr

Great news! Thanks for posting back.

Be sure to replace the other flex hose too...if one was that bad, the other one isn't far behind.

Richard
94 C2500LD / 94 C1500 / 06 300C SRT8
Check out my truck shop projects


 
72novadrvr 
Forum Newbie
Posts: 5
72novadrvr
Reg: 04-23-12
04-27-12 02:42 PM - Post#2219736    
    In response to someotherguy

Yep got both did both.
72 Nova 350, 700R4
94 Silverado 5.7L 2WD


 
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