1992 gmc sierra 5.7l egr valve

  #1  
Old 11-12-2014, 07:25 PM
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Default 1992 gmc sierra 5.7l egr valve

hello, im having trouble getting my truck to pass emissions so i changed the egr valve today, after i changed it now the truck runs rreally rough for about 30 seconds after you start it. it revs up and down and struggles to stay running immediatly after starting for about 15-30 seconds then it seems to smooth out. any help? also while messing with it trying to fiugre out the problem i snapped the little bent black plastic tube that comes off the valve. i rigged it with some shrink tube but cant find that little tube available anywhere. any help on that also?
 
  #2  
Old 11-12-2014, 07:36 PM
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the egr should be closed at idle. If its running properly, its should not impact idle quality.
what failed on your emission test, nox? Post all the results and specs if you have them.
 
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Old 11-12-2014, 07:45 PM
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yes nox was 10.4 standard is 3.0

i cant help but think it has something to do with the egr valve though because the truck ran great literally 10 mins before wen i started and drove it into my garage, i change the part and now it runs really messed up for about 30 seconds
 
  #4  
Old 11-13-2014, 07:06 AM
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how is the egr controlled. I know you said it had a vacuum port. I'm wondering if there are different types and you have the wrong one. my old car from the 80"s had 2 options; positive and negative backpressure controlled valves.


is your repaired vacuum line leaking. block off the source port and try a start up.
 
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