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FAQ #1 EGR Code: 71,PO401

Discussion in '80-Series Tech' started by landtoy80, Feb 3, 2004.

  1. landtoy80

    landtoy80

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    If we are going to start a FAQ Sticky. This would be #1
    We are going to have a FAQ Sticky arn't we?

    What are the EGR codes for '95 and newer 80's?

    If everyone that has fixed their EGR problem post their fixes.
     
  2. Beowulf

    Beowulf

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    Kurt,
    Or you could do a search so we don't have to repost all the fixes. :D

    -B-
     
  3. landtoy80

    landtoy80

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    I am waiting for the down load function to work so I can down load all the EGR info and look search it when I am off line.
     
  4. landtoy80

    landtoy80

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    I can't find my old modulators :'( Any one have their old failed modulators?
     
  5. Darwood

    Darwood

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    You mean like these?

    [​IMG]

    [​IMG]

    [​IMG]

    I still have the thing as well.
     
  6. landtoy80

    landtoy80

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    Good.
    Do you have a way to test for leak by putting light air pressure on the bottom port. I would assume a vacuum tester would work but it works by exhaust pressure.
     
  7. Darwood

    Darwood

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    I have these on my site courtesy of B I think:

    [​IMG]

    [​IMG]

    I never checked my modulator since I was pretty sure it was toast. I just bought a new one (along with a new VSV valve the next week). I also replaced alot of the vacuum hoses to be on the safe side.
     
  8. Beowulf

    Beowulf

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    Derek,
    Those were courtesy of either photoman or landtank. I don't have a scanner.
    -B-
     
  9. Darwood

    Darwood

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    Sorry my bad...
     
  10. landtoy80

    landtoy80

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    I did a egr search and it only goes back to jan,2004.
    I think there were egr problems before that :-\
     
  11. landtank

    landtank SILVER Star

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    they look vaguely familiar ::)
     
  12. Darwood

    Darwood

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    [quote author=landtank link=board=2;threadid=10984;start=msg98759#msg98759 date=1075855798]
    they look vaguely familiar ::)
    [/quote]

    I hope you don't mind my stealing the scans landtank :D

    thanks ;)
     
  13. ParadiseCruiser

    ParadiseCruiser

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  14. mjos

    mjos

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    EGR VSV was the culprit on mine. 2K miles later and no codes :)
     
  15. RavenTai

    RavenTai

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    I hope we get a sticky of some sort, like a lot of forums there are a lot of repeat questions, some are pretty lame (same question few lines down) but sometimes it is hard to search for the answer when you don't know what you are looking for


    this might be a good addition has not been mentioned yet:


    [quote author=cruiserdan link=board=2;threadid=9952;start=msg88362#msg88362 date=1073765754]


    All of the recent activity pertaining to EGR troubles has reminded me of an instance our shop delt with a few years ago. Instead of posting this in an existing thread I thought I would start a new one in an effort to reach more members:

    The vehicle in question was a 96 80 series that had a check-engine light triggered by an EGR malfunction. One of our master techs battled the damn thing for several days and numerous visits. He did all of the standard "fixes" that have been posted here ad-infinum.

    He was about ready to push the SOB outside and set it on fire when he came to me. "are you driving your Cruiser today?" he asked. Smart a$$ me said, "Am I at work?" :D He said :flipoff2: "let me under the hood. I want to look at something"

    Off we go to my vehicle. I opened the hood and he went straight for the vacuum hose that leads from the EGR valve to the intake plenum. On the surface it appears that this hose is drawing vacuum from the intake plenum. IT IS NOT. In reality it is a tube that TRANSITS the intake plenum and the other end of it is an attachment for the VSV! He applied vacuum to the "bib" off of the plenum and it "breathed" freely. The tube in the vehicle he was working on DID NOT, it was plugged up solid. He bypassed it with a length of vacuum hose and the system was healed.

    This may or may not be something that would happen to other vehicles but I feel it is important enough to check out.


    :cheers: D-

    [/quote]
     
  16. RavenTai

    RavenTai

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  17. landtoy80

    landtoy80

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    Someone with a '95+ FSM post the codes for the EGR.
     
  18. Eduardo96FZJ80

    Eduardo96FZJ80

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    PO401 = insufficent EGR flow

    PO402 = excessive EGR flow

    is this the info you needed?
     
  19. landtoy80

    landtoy80

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    Yes.
    I want all the codes for the EGR system.
     
  20. Junk

    Junk

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    Now have replaced every componenet and still get P0401. Next component to be replaced is the whole pos truck.