2nd Gen S-series (1995-2005) Tech Discuss 2nd generation s-series (1995-2005) general tech topics here.

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

Old 01-13-2019, 09:43 PM
Starting Member
Thread Starter
Join Date: Jan 2019
Posts: 1
4jdh2 is on a distinguished road
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)
Old 01-14-2019, 01:47 AM
error_401's Avatar
Join Date: Nov 2007
Location: Zurich
Posts: 1,114
error_401 is on a distinguished road

First welcome to the Blazerforum.

Thread has been moved to the appropriate section as per the rules in the New Member Section.
Related Topics
Thread Starter
Last Post
General Chat
10-16-2013 09:07 AM
1st Gen S-series (1983-1994) Tech
03-21-2011 09:31 PM
1st Gen S-series (1983-1994) Tech
09-09-2010 07:35 AM
2nd Gen S-series (1995-2005) Tech
08-29-2010 11:25 AM
1st Gen S-series (1983-1994) Tech
05-05-2008 03:14 AM

Thread Tools
Search this Thread
Quick Reply: 95 blazer 4.3 250k, ca emissions high NOX 15-25 MPH

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.