1995 Chevy Blazer Low Idle Codes

1995 CHEVROLET TRUCK
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SPONGER
  • MEMBER
  • 22 POSTS
I have 95 Chevy Blazer 4.3L I had posted a question asking weather I had an OBD 1 or 2. I found out I had an OBD 2 which goes against the "96 or newer has an OBD 2 rule". Anyhow, I bought an Actron pocket scanner and pulled three codes. P0134, P0141, and P1406. I have the first two codes figured out. They are O2 sensor issues. The third code refers to and I quote from the CD that came with the scanner: "Manufacturer Contrl Auxiliary emission Controls" the caps and spelling were exactly as I have it in quotes. The CD doesn't give me any explanation and neither does my Haynes manual nor my owner manual. Do you have any insight to this?
May 1, 2006 at 12:22 PM
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SDALTON19
  • ✓Experienced Mechanic
  • 87 POSTS
first of all i dont know who told you 96 and up were all obd2 thats not true ford started testing the american version of the obd2 as early as 93 and used in 94 i know some foriegn car manufacturers started even earlier than that second about your codes p1406 is an egr pintle issue more than likely (and these vehicles were notorious for this) the egr valve has been jammed by a clump of broken carbon maybe as simple as taking it apart and cleaning it or could be a faulty valve or wiring. third i'm not convinced the other 2 codes mean that the oxygen sensors are bad seems strange to me that both o2 sensors are failing on one side you might want to take a look at the fuel injection system i believe has a spider style injector that was real bad about leaking fuel and could cause those 2 codes to set if you need more info about this just ask
May 27, 2006 at 1:20 PM
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SPONGER
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Hey. Thank you for your information. I had already figured out the 1406. I replaced the EGR to a more updated version which shouldn't trap as much carbon. I had the O2 sensors replaced and it still idles a little low. I had a guy tell me it was the catalytic converter and the rattling from low idle damaged the new O2 sensor. Do you think it would be cheaper and/or easier to check injectors or catalytic converter?

P.S. I would also like any information you have on the injection.

Thank you again.
May 28, 2006 at 9:05 AM
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Suggested Repair

For P1406, inspect the EGR valve for carbon jamming the pintle; clean it or replace the valve or related wiring if needed. For P0134 and P0141, do not assume both oxygen sensors failed. Check the spider-style fuel injectors for fuel leaks that can set those codes and contribute to a low idle.

Conversation Summary

The owner of a 1995 Chevy Blazer 4.3L pulled codes P0134, P0141, and P1406 and asked what P1406 meant. The expert said P1406 points to an EGR pintle problem, often carbon buildup, a faulty valve, or wiring, and suggested the paired oxygen-sensor codes could come from a leaking spider-style injector rather than two failed sensors. The owner later replaced the EGR and oxygen sensors but still had a low idle and asked whether to check the injectors or catalytic converter; that follow-up was not answered in the thread.

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