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Insufficiant air flow P401

Tiny
R&S
  • MEMBER
  • 1940 CHEVROLET
I HAVE A 1996 CHEVY LUMINA 3.1 V6. 112,000 MILES ENGINE LIGHT HAS COME ON. MY OB11 CODE READER SAID CODE P401, INSUFFICIANT AIR FLOW.
I HAVE REPLACED THE ELECTRONOC EGR VALVE WITH A NEW ONE BUT ENGINE LIGHT STILL COMES ON. WHAT ELSE COULD IT BE?


I noticed that wiith the egr valve plugged in but not bolted in place, the valve did not move when iI acclelerate with the old valve, or the new egr valve.
shoudnt the piston move up and down when you rev the engine. Also have checked the fuse for egr it is fine. What elso could it be not making the valve/piston on egr not move
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Tuesday, January 16th, 2007 AT 12:12 PM

2 Replies

Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
Yes you're right, the p0401 says: EGR system flow insufficient.
This is common mistake most peoples making.
You could save money, keeping your old egr valve.
Removed the new one you have installed.
You have 3 orifices down there between the exhaust and the intake manifold one or more of these small orifices are plugged. Use a scraper or screwdriver to scrap it until it's unplugged.
Do not forget to reset the code.
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Tuesday, January 16th, 2007 AT 12:53 PM
Tiny
RRASSIAS
  • MEMBER
  • 5 POSTS
Thanks i"ll try that.I did install anew egr vlv but didnt clean the orifices
bob
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Saturday, July 21st, 2007 AT 7:18 AM

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