XG350 fuel injector and now EGR problems

Discussion in 'Hyundai Grandeur / Azera / XG' started by Dan K, Apr 18, 2008.

  1. Dan K

    Dan K Guest

    I had a fuel injector go bad the other day on my 2002 XG350 - apparently it
    was spraying gas all the time. I was able to limp home and then got screwed
    by the local garage when they fixed it. $600 to replace a fuel injector and
    do shoddy work like forget to plug one of the electrical connectors back
    together, leave the back 7 bolts on the plenum lose, forget to tighten one
    of the hose clamps on the air snorkel altogether, and over tighten the oil
    filter when they changed oil (that I didn't authorize). But all that is in
    the past, or is it?

    A few days later the check engine light lit up and the code is P0401, EGR
    flow insufficient. Needless to say, I don't want to bring the car back to
    that garage (I'm sure they could scam some more money out of me - they were
    really slick). From what I could get out of the web site and my service
    book, this almost looks like a low vacuum problem rather than an EGR valve
    problem. Any recommendations as to how to fix it? I have a second 2002
    XG350 that I can swap parts back and forth with. Also, If the EGR valve is
    a suspect, how does it come off? There are 2 bolts that hold it to the
    polonium, but then there is a big nut connecting it to a tube...looks like
    there isn't enough room back there to get a wrench on the nut. If the nut
    does come off, is there some sort of thread sealant required when you
    re-install? sparkplug antiseeze compound maybe? Also the manual stated
    that the EGR gasket should be replaced. How important is this? - I've done
    spark plugs a couple times and have never bothered with the EGR gasket.


    Dan K, Apr 18, 2008
    1. Advertisements

  2. Dan K

    hyundaitech Guest

    Check the small things first. Make sure the shop connected the vacuu
    lines properly and that the EGR solenoid is plugged in. The shop may hav
    removed or disconnected the EGR valve when removing the plenum to acces
    the injector.

    A quick check of the vacuum lines is to use needlenose pliers to pinch of
    the hose with the yellow stripe while the engine is idling. This shoul
    cause the EGR valve to open and the engine to run rough. If this occurs
    you can pretty much conclude that the hoses are run correctly and that th
    EGR valve and passages are functioning normally, leaving the EGR solenoi
    and vacuum bleed-off valve as possible culprits.

    It's doubtful that the EGR valve is the problem, but I've seen it occur.
    Before swapping parts, use the other XG to verify the proper installatio
    of all parts
    hyundaitech, Apr 18, 2008
    1. Advertisements

  3. Other competancy issues aside, it was probably a good idea to change the
    oil. If there was a lot of gas being sprayed in the cylinders, it may have
    gotten down into the cranckase.
    Edwin Pawlowski, Apr 18, 2008
  4. Dan K

    Dan K Guest

    Thanks Hyundaitech and others, turned out to be a broken nipple on the EGR
    solenoid. Whoever broke it then placed the vacuum hose back in position so
    nobody would notice. I had been over that whole circuit at least twice and
    did not see anything wrong. Not until I started troubleshooting and
    touching things did the problem become evident. I was able to glue the
    solenoid back together, but I'm going back to that garage tomorrow, armed
    with pictures and the price of a new solenoid ($52.20 plus tax) to do
    battle. This was a deliberate attempt to cover up a mistake on their part.
    For all I know, they knew I'd be back in a few hundred miles so they could
    try and get some more money out of me.

    Dan K, Apr 21, 2008
  5. Dan K

    Randy Pape Guest

    i feel sorry for you and i got ripped off for the tune of 800.00 at a local
    garage also. i swear i will never take mine into one of these type of shops
    again, even if it's highly recommended , like this one was.
    Randy Pape, Apr 21, 2008
  6. Dan K

    Old_Timer Guest

    As automobile diagnosis and repair became much more technically
    oriented most old time shade tree mechanics such as myself admitted to
    themselves that they do not have the skills required for repairing
    cars especially those manufactured since the OBD system came about.

    There are small independent repair shops in business who quit
    obviously also do not have these skills.

    I use my judgment of the skill level required before deciding to take
    my vehicles to a in dependant shop or to the dealer. For example, I
    will take it to an independent that comes well recommended for brake

    If it is a problem that requires some indepth analysis and diagnosis,
    I go to the dealer. (not to say a dealer mech can't screw up, but the
    odds are far better than at Jiffy Lube)

    From an Old_Timer who worked on Model A Fords before they became
    collector cars.

    Old_Timer, Apr 22, 2008
  7. Dan K

    Randy Pape Guest

    i admire your candor Mr. old timer :) you at least are big enough to admit
    when to say when .
    i agree with you ,i'm only 49 yrs old ,but I've learned a tremendous amount
    about troubleshooting these newer cars and have some good general diagnostic
    equipment, but my last ordeal, would have been done months earlier and for
    less money, if i would have gone to the dealer first thing. the moral of my
    story is, just because someone has a 7000.00 scan tool, doesn't mean they
    know how to use it.
    Randy Pape, Apr 22, 2008
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.