'96 Sls: P1406: Egr
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Northstar Engines and System Technical Discussion Discussion, '96 Sls: P1406: Egr in Cadillac Engine Technical Discussion; Following is part of a post I came across: So that code is telling you that the computer is unable ...
  1. #1
    mimusgilvus is offline Cadillac Owners Member
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    '96 Sls: P1406: Egr

    Following is part of a post I came across:

    So that code is telling you that the computer is unable to accurately sense the EGR valve position. It means that either the EGR valve is bad or wiring to the EGR valve is damaged or the EGR valve needs to be cleaned.

    I think the P1406 code on my '96 SLS is due to faulty wiring. This EGR valve had been replace several times in the last year for me by a shop, but the P0401 code keeps coming. I finally took a lookat it myself and noticed that the wire jacket (male part) that plugs into the EGR valve (female part) was falling apart and the red lead actually came out while in my had. An electrical engineer friend of mine took the male jacket apart, soldered the leads back to the metal connectors, replaced the plastic jacket. The "service engine" light went off for two days then came back on. My guess is the male plug is still compormised. That's when I ran OBDII and got the P1406. Additionally, there is some transparent, gummy substance in jacket of the female plug that seems to melt into a fluid when the engin gets hot. Is that supposed to be there? Maybe its some sort of thermal insulator or something?

    Anyways, anyone could give me ideas on the "gummy stuff" in the EGR valve plug? And tell me what the name of that male part is that plugs into the EGR valve? And where I could buy one (AutoZone couldn't figure it out). I think if I replaced that male plug the problem may be fixed (since the valve is new it shouldn't need cleaning or replacing).

    Thanks....

    P.S.: I'm new to this site. So, hope I'm posting this to the right place...

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    Re: '96 Sls: P1406: Egr

    The connector should be clean & dry. This may be what you are looking for.
    ACDELCO Part # PT1154 More Info {5-WAY FEMALE LIGHT GRAY #15306027}
    CONNECTOR,SOL-EGR PWM VLV $22
    Go to http://www.rockauto.com. Open the parts catalog and when you get it open to your year and model click on electrical connectors.

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    mimusgilvus is offline Cadillac Owners Member
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    Re: '96 Sls: P1406: Egr

    Hey...That's exactly what I need...I guess I had the "male" and "female" mixed up (...not funny...)...

    So, if the Male part (on the EGR itself) has all that gummy stuff in it, should I try cleaning it out with some sort of alcohol solvent, or do i just buy a new EGR....

    I think I'l try cleaning it out....

    Thanks alot....Great Help!!

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    Re: '96 Sls: P1406: Egr

    Spray it with Brakleen or electrical parts cleaner and wash the stuff out. I'd take the EGR valve off and hold it upside down while doing it so as not to allow any solvant to run into the "can". It can dissolve the insulating varnish on the windings and render the EGR useless.

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    mimusgilvus is offline Cadillac Owners Member
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    Re: '96 Sls: P1406: Egr

    Can I use Brakleen to clean the actual valve (pintle)? May as well clean it if I take the unit of...right?

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    Re: '96 Sls: P1406: Egr

    Brakleen should work, but something for carbon is probably better, like Gumout, carb or TB cleaner.

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    mimusgilvus is offline Cadillac Owners Member
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    Re: '96 Sls: P1406: Egr

    Yeah....Gumout seem to be what's suggested everywhere I look....

    Thanks....Will let you know how it goes....

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    mimusgilvus is offline Cadillac Owners Member
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    Re: '96 Sls: P1406: Egr

    Hey,

    Never gota round to cleaning that EGR valve...Too busy...Am I to undertand that i should spray the Gumout on the outside of the pintle only and not in the other hole? Nor should I spray while depressing the pintle?

    Maybe I'll get around to cleaning it this week....

    I actually have MAP (manifold absolute pressure) and MAF (Mass air flow) code now (code P0108)...

    We'll see........

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    Re: '96 Sls: P1406: Egr

    No, spray the pintle and depress it. Just hold it up right (as mounted) so that the fluid runs down.

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    mimusgilvus is offline Cadillac Owners Member
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    Re: '96 Sls: P1406: Egr

    So, I took of the valve and cleaned it....OBD still shows 3 codes.....
    Got two EGR problems to deal with....1) the valve seems to have something "rattling" around in it. Is that normal, or is the valve defective? 2) is there anyway to test the "electrical integrity" of the valve, or is cleaning the pintle the most I could do with it?

    I'm starting to think i might have to just buy a new one...

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    Re: '96 Sls: P1406: Egr

    Not quite sure how to test it. I don't ever recall any rattling.

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    mimusgilvus is offline Cadillac Owners Member
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    Re: '96 Sls: P1406: Egr

    well..after attachinghte new connector and cleaning hte EGR unit, I finally reset the codes and they haven't come back on yet....been3.5 days...Hopefully it'll stay off for a while.

    Thanks,

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    mimusgilvus is offline Cadillac Owners Member
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    Re: '96 Sls: P1406: Egr

    Check engine light came back on about a week ago.....I figured out how to use the built in OBD. So, I don't have to run down to Autozone every time now. The code is now P0717 Input speed Sensor. I cleared the code and it hasn't returned yet. I'm planning on buying one if it comes back on. It's only about $13.00. Does anyone know if this sensor could be cleaned or tested, etc.?

    Happy Thanksgiving....

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    Re: '96 Sls: P1406: Egr

    Input speed sensor? That is the $20 part, $2000 deep in the trans.

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    mimusgilvus is offline Cadillac Owners Member
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    Re: '96 Sls: P1406: Egr

    Yeah...? For some reason I didn't think it was a transmisson mounted sensor....but, looks like you're right. Hmmm.....Well....so much for that idea...

    Thanks for the quick reply. Any turkey today? Hope it was good.

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