EGR Question

Discussion in 'Volvo Forum' started by 325TahoeSS, Jun 16, 2013.

  1. 325TahoeSS

    325TahoeSS Light Load Member

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    Feb 11, 2012
    Roma, Tx
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    If my EGR valve is bad will it cause my truck to lose power & waste more fuel? And what more less will it cost to get one installed? And how long will it take to get it installed?
     
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  3. 325TahoeSS

    325TahoeSS Light Load Member

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    Feb 11, 2012
    Roma, Tx
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    I ask if the EGR valve has anything to do with my fuel consumption because I can BAIRLY get 5.3 MPG with a load that weighs 78,000 on a box trailer driving around 70MPH! I've tried driving 65MPH & I get the same 5.3 MPG! This is a V-12 with a 13 speed
     
  4. snowwy

    snowwy Road Train Member

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    i've got a straight 6 and get the same thing. that's half the cylinders so quit yer complaining. LOL.
     
  5. marek4792

    marek4792 Light Load Member

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    Mar 21, 2011
    Chicago, IL
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    you probably mean a VED-12, and yes a bad or a improperly functioning EGR can cause a loss of power as well as anything to do with the VGT as these two seem to communicate together, atleast in Cummins they do.. are you blowing black smoke out the back? experiencing a noticeable loss in power prior to the issue?
     
  6. 325TahoeSS

    325TahoeSS Light Load Member

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    Feb 11, 2012
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    Yea ved 12, I've noticed a huge power loss but no black smoke! I use to get 6.3 - 7 MPG now only high 4's to low 5's mpg
     
  7. VisionLogistics

    VisionLogistics Road Train Member

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    Many do indeed see an improvement in MPG. If it's not throwing codes yet, it's probably still functional, so try unplugging it in the closed position and see if your MPG average improves a little. Here's the quick steps on how:

    1. Wait until the engine is cool, preferrably after it has sat overnight without running.
    2. Turn the key to ON, but do not start the engine. Let it sit for about 1 minute. We want to make sure the valve closes if it was open. This step should do that.
    3. Turn key back to OFF.
    4. Open hood, locate the EGR and unplug it. On cummins, there is a plug connector that goes into the back of the valve body, and a position sensor plug that is on a wire lead. Unplug the one that goes into the back of the body, leaving the other alone. Tape the plug connector off so contaminants don't get into the holes.
    5. Drive the truck normally for a few days and see if it is getting better mileage. It will probably throw a code, and the Check Engine Light will come on. If you run it like this permanently, I'd have the valve welded shut so you can plug it back in to silence the codes / light. Some folks opt to block it with a plate instead, which also works. For a temporary solution, you can buy a scangauge D for $159 on ebay (new with warranty) or other outlets. The scangauge D will allow you to read the codes in the ECM, clear them, and also ignore them. So with the EGR, since it will constantly throw codes while unplugged, you can ignore the codes for that condition, and the scangauge will alert you to other codes. This is useful because if your check engine light is on constantly, without a scangauge or other diagnostic tool, you wouldn't know if new DTC's (diagnostic trouble codes) were being thrown.

    I run with mine unplugged, and gained nearly a point on my MPG. I was averaging 5.3 or so, too. Now I average around 6 with the same conditions. The engine runs a lot cleaner, and has more power, too. It also *sounds* like it runs better.

    Good luck.
     
    Johny41 Thanks this.
  8. 325TahoeSS

    325TahoeSS Light Load Member

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    Where would the EGR valve plug be located on my Volvo engine?
     
  9. VisionLogistics

    VisionLogistics Road Train Member

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    The valves are located on the right side of engine attached to the exhaust manifold just above the turbo, there are two of them. The valve wires run under the heat shield to the left side of engine where they plug in behind the alternator. I've never disconnected them on a VED-12 so your results may vary. Perhaps someone who has can chime in with their experience in the matter.
     
  10. vikingswen

    vikingswen Road Train Member

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    Jun 14, 2012
    In the Stratosphere
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    How is your boost pressure? I just experienced the same thing with a D-13 500hp and the I-shift transmission. Lost power, same drop in fuel mileage. I finally got my windex bottle out sprayed down all the boots and charge air cooler with the engine running at high idle. One of the crimped steel clamps from the factory was leaking right after the turbo. Since I could not get it off on the side of the road I added a hose clamp and boost pressure went up and fuel mileage went up by almost 2mpgs.
     
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