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Thread: Question for SanteeSwamper

  1. #1
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    Default Question for SanteeSwamper

    Got a question for our resident mechanics.

    My truck, 97 gmc k1500 is throwing a p1406 code ( egr valve pintle position)

    About two years ago around this time truck started acting a little funny with just a random misfire. Pulled the code and it was for the egr valve. It looked to be the factory original so I just replaced it. Couple months later I replaced the ECT sensor as well due to rough startup and rough idle. That all seemed to take care of the problem and she was back running like a top until last March when the egr valve code popped up again.seeing as how the valve was only a year old I took it to a reputable mechanic here in town and had him look at it. He said according to his computer and looking under the hood there were no other problems and to just try a new egr valve. put a new one on that afternoon and haven't had any problems up until last week when I noticed something didn't seem right, sure enough it was the p1406 code again.

    Question is, am I just having bad luck with egr valves ( in 1yr increments) or do I have an underlying problem causing this and what could that be? I took the valve off today and sprayed it out with carb cleaner until it ran out clean and there was no noticeable carbon buildup in the egr valve or the intake where it bolts on. The current egr valve is still under napped warranty until late next week as i still have the receipt
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  2. #2
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    I meant to put " question for KRT / SanteeSwamper " as the title


    Oh well
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    Deeeeeee....



    Lete.

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    Do you have a fluke meter? If so I'll get you the test on it. It could be electrical fault

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    Quote Originally Posted by CurLee View Post
    Deeeeeee....



    Lete.
    Delete what?

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    Quote Originally Posted by santeeswamper View Post
    Delete what?
    don't have a fluke but I do have a meter and am well versed in using it
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    That's fine long as it's multimeter. I'll get you the test in the am

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    That EGR valve is linear and not vacuum controlled. Basically the valve is controlled electronically. I'm not certain how a multimeter is going to tell you anything but reference voltages (5 wire system). I use a volt meter and a scan tool and power the valve open and see if You get 5 volts or close.

    It's a simple circuit on a Chevrolet. If passages are clean and a valve seems to last you a year I'd lean towards a valve. Replace it with AC Delco. If not you have a wiring issue but most likely the PCM is bad.
    More fuel = more boost!!

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    Quote Originally Posted by santeeswamper View Post
    That's fine long as it's multimeter. I'll get you the test in the am

    Sent from my Pixel XL using Tapatalk
    much obliged

    Quote Originally Posted by KRT View Post
    That EGR valve is linear and not vacuum controlled. Basically the valve is controlled electronically. I'm not certain how a multimeter is going to tell you anything but reference voltages (5 wire system). I use a volt meter and a scan tool and power the valve open and see if You get 5 volts or close.

    It's a simple circuit on a Chevrolet. If passages are clean and a valve seems to last you a year I'd lean towards a valve. Replace it with AC Delco. If not you have a wiring issue but most likely the PCM is bad.
    I will most likely get a new one regardless of any electrical test results since it is still under warranty. cousin-n-law runs the local napa and will swap it out for me no questions asked.
    If new valve gives me the same problem then you say I need to look at the powertrain control module?

    how can I tell if it is bad?
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    That's how we will tell if the PCM is bad with a multi meter. As he said above we will test the 5 volt references. That's why we need a fluke.

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    Quote Originally Posted by santeeswamper View Post
    That's how we will tell if the PCM is bad with a multi meter. As he said above we will test the 5 volt references. That's why we need a fluke.

    Sent from my Pixel XL using Tapatalk
    got ya,

    look forward to hearing from ya in the morning

    THANKS!!!
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    You would need a volt meter and a wiring diagram. Average person prob catch hell doing a pin test. I would have a reputable tech check PCM, but it's most likely culprit if valve is good.

    Easiest is switch out valve especially if under warranty.
    More fuel = more boost!!

  13. #13
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    EGR sucks

    EGR on a Ford really sucks.
    More fuel = more boost!!

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    Quote Originally Posted by KRT View Post
    You would need a volt meter and a wiring diagram. Average person prob catch hell doing a pin test. I would have a reputable tech check PCM, but it's most likely culprit if valve is good.

    Easiest is switch out valve especially if under warranty.
    somehow or another I managed to get a degree in industrial electronics, so if push comes to shove I can probably figure it out
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    Quote Originally Posted by Duck cutter View Post
    somehow or another I managed to get a degree in industrial electronics, so if push comes to shove I can probably figure it out
    Roger that. My bad.

    I don't have a degree in shit except screwing stuff up.
    More fuel = more boost!!

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    Quote Originally Posted by KRT View Post
    Roger that. My bad.

    I don't have a degree in shit except screwing stuff up.
    lol. I seriously doubt that
    Houndsmen are born, not made

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  17. #17
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    Well based on research I should have 5 volts coming into the gray pontentiometer wire of the egr valv. if I don't, check it at the pin to make sure there's not a break/open in the wiring harness and if no voltage at pin I have a bad pcm

    That sound about right to y'all?
    Houndsmen are born, not made

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  18. #18
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    But the easiest thing to do is warranty out the valve and see if that takes care of it
    Houndsmen are born, not made

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    I STAND WITH DUCK CUTTER!
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  19. #19
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    Quote Originally Posted by Duck cutter View Post
    But the easiest thing to do is warranty out the valve and see if that takes care of it
    Yep, like I said earlier, it's not really costing you anything to do that. If that doesn't do it you have bad wiring or a PCM. Most likely PCM.

    As far as the 5 volts.... that's reference voltage. You will need to power the valve open and check your voltage and see if it goes from .8 to 5 ish volts. Basically that voltage has to swing.
    More fuel = more boost!!

  20. #20
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    Quote Originally Posted by Duck cutter View Post
    lol. I seriously doubt that
    No, he was being very honest.
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