Question about 1997 Chevrolet Venture

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Code po401 chevy venture LS 1997

The code take's a while to set , then i reset it and it takes about a week of driving for it to reset , is there a blockage problem with the EGR and is there a passage that leads to the egr on the throttle body ,, should i clean all i find ? no drivablity problems when i the light is on ,,108,000 mile runs super nice even when code is set

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  • Paul Lima Aug 12, 2008

    thanks Jesse i'm giving it a try today , i;ll get back to u on what i found

  • Paul Lima Aug 14, 2008

    completly blocked EGR port,, in the intake manifold peleum right behind the throttle body ,,,, easy cleaning with carb cleaner and a pick to pick at the carbon build up.. took about an hour worth of work , gasket 5 dollars can of carb cleaner 3.50 and its done!!!,, the PCM = computer uses the Map sensor to check flow, its voltage go;s up to 9.0 this is a sign to the PM that very low to none of the EGR gas'es have reached the Intake and to the combustion chamber.. takes about 9 drives cycles for the PMC to see that the fix took ,, then everything should be ok , code gone and ready for Emisson testing, PS the PCM is very good with EGR releted curcit promblems ,, with other codes that would be your EGR valve is bad ,, so the EGR gas flow will almost be always a blockage of the system with the code PO401

  • Paul Lima Mar 10, 2014




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I would definitely clean out any residue i find in the exhaust passaged-cloggage can cause definite problems-clean all you find and go from there,if that doesnt work and code come back-replace the egr valve

Posted on Aug 12, 2008


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