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95 blazer 4.3 250k, ca emissions high NOX 15-25 MPH

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Old 01-13-2019, 09:43 PM
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Question 95 blazer 4.3 250k, ca emissions high NOX 15-25 MPH

Experience level (well above average DIY). i have owned this vehicle since 2k, and since 2012 have had same issue, sometimes pass smog sometimes not
replaced injectors, egr (electronic) valve, new cat, replaced PCM, decarbonized( removed Plenum fed wire), clamped off HVAC, checked electrical wiring,vacuum port and monitored MAP,CAT,FUEL TRIM, O2,vac measured other sensors(bench tested and diagnostic software) new 02, no problems found. High NOX 15-25, no codes, now I get code P0401 after replacing egr wire connector, 250K miles, paid professional diagnostic,dealer said bad 02,bad joke 02 was just replaced, paid another smog professional said bad cat, new cat. I now believe the engine pcm is programmed for this issue after 200k miles and the dealership can fix the problem by reprogramming the ECM for and amount more than the value of the vehicle, One smog pro said just retire the vehicle.Vehicle runs great and $1k barely buys for tires, CA emissions, engine has no carbon deposits in plenum and runs at 178 F

All suggestions welcome except (retire vehicle)
 
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Old 01-14-2019, 01:47 AM
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