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GM P1406 code with new EGR valve


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Marco1974
Novice

Sep 29, 2018, 4:09 PM

Post #1 of 6 (190 views)
GM P1406 code with new EGR valve Sign In

1996
GMC C1500 Suburban
5.7L

Does anyone know if anything other than a bad egr valve will cause a P1406 code? This is a Jegs crate engine with about 40 miles on it, all new sensors (including the egr valve). I was just curious if there could be another issue before i try testing the new egr valve.

Any tips are greatly appreciated!
-Marco


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 29, 2018, 5:17 PM

Post #2 of 6 (182 views)
Re: GM P1406 code with new EGR valve Sign In

That code is for a bad pintle position. Since that valve is self contained with the sensor included, it can only be the valve or the wiring. It's common on an older engine to have chunks of carbon break off and get caught in the pintle, holding it open.

You wouldn't need to replace the valve, simply clean the carbon out but don't be surprised if there is more carbon in the engine and it happens again.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Marco1974
Novice

Sep 30, 2018, 10:28 AM

Post #3 of 6 (160 views)
Re: GM P1406 code with new EGR valve Sign In


In Reply To
That code is for a bad pintle position. Since that valve is self contained with the sensor included, it can only be the valve or the wiring. It's common on an older engine to have chunks of carbon break off and get caught in the pintle, holding it open.

You wouldn't need to replace the valve, simply clean the carbon out but don't be surprised if there is more carbon in the engine and it happens again.


Thanks, Carbon shouldn't be an issue since the entire motor is newly rebuilt, but i think i have the old EGR valve still that i might swap out since i know that one was working before.. I just wanted to make sure there wasn't anything else that could be causing the valve not to work right..

-Marco


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 30, 2018, 9:32 PM

Post #4 of 6 (142 views)
Re: GM P1406 code with new EGR valve Sign In

Marco: "Rebuilt" is light years from new which is just once. Look at the pintle and test it off just push on hard wood you might even see some junk fall out or not carbon or other junk. IDK - might be able to save the gasket if you carefully grease it or the next if needed to swap with your known (thought to be) good one?


T



Marco1974
Novice

Oct 1, 2018, 3:35 PM

Post #5 of 6 (124 views)
Re: GM P1406 code with new EGR valve Sign In


In Reply To
Marco: "Rebuilt" is light years from new which is just once. Look at the pintle and test it off just push on hard wood you might even see some junk fall out or not carbon or other junk. IDK - might be able to save the gasket if you carefully grease it or the next if needed to swap with your known (thought to be) good one?


T


Thanks Tom,
By rebuilt I mean it was a crate longblock from Jeg's. everything besides the intake manifold is new and though I had the manifold cleaned it did still have some carbon on the top half so I will take a closer look at the EGR.. Also as a side note, it doesn't throw the code at idle. If I clear the code, it only shows up when I get the truck up to around 50mph+

I am also going to check for a vacuum leak as soon as I get some time to dive back under the hood.

-Marco


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 1, 2018, 4:09 PM

Post #6 of 6 (122 views)
Re: GM P1406 code with new EGR valve Sign In


Quote
lso as a side note, it doesn't throw the code at idle.


Of course not. The EGR doesn't engage at idle.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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