vnl 670 leak problem

Discussion in 'Volvo Forum' started by maconhadalata, Dec 26, 2014.

  1. maconhadalata

    maconhadalata Light Load Member

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    Dec 11, 2014
    newark, nj
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    I have a 2006 670 w/ ved 12 engine.i bought this truck and after 2 weeks all problems started . truck had engine light and code for egr valve#2 but was doing ok(power and mileage).All of a sudden i started hearing a air leak noise by the turbo and truck went on derated mode.Replaced the egr valve , check engine light went off.Ran the truck on interstate 95 for miles hooked to a vcad .boost pressure a little over 30(dont remember how many kpa).Tech said everything was looking good but that leaking sound wouldnt go away.He said that was probably my exhaust that was leaking.
    hooked up my trailer and got back on the road. as soon as i start climbing a hill and my turbo spools i hear that sound and my mileage barely gets to 6(only pulling less than 20K)
    Now truck is sitting in a shop, tomorrow im replacing intercooler, overflow valve and some other parts.I made a tool to pressurize the intake system and found a leak on the intercooler (really small).Im sure that the sound i was hearing is not coming from the intercooler and when pressurized the noise was minimal.If i replace the intercooler tomorrow and this air leak doesnt go away? what else to look for? can it be the epg behind the turbo?
     
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  3. maconhadalata

    maconhadalata Light Load Member

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    Dec 11, 2014
    newark, nj
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    i never liked volvos now im just thinking: why in the hell i bought this truck???? long story short: my friend went back to his country and sold me cheap, no down payment, pay as you can kind of thing... i think a cheap volvo still overpriced lol.
     
  4. Boka

    Boka Light Load Member

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    Nov 6, 2012
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    Have you replaced all of the EGR exhaust pipes when you had the EGR replaced? Thats usually where the leak begins after they remove them and it sounds like an air leak. And BTW you should have replaced both EGRs at the same time (the other one will go bad within days or weeks)
    I have replaced two sets of EGRs in past 9 months (second time it was under warranty)
     
  5. EHB

    EHB Medium Load Member

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    Apr 26, 2011
    Newfoundland
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    When was the muffler ever replaced... a backed up or clogged muffler will put a big strain on the engine and cause codes up the wazoo.
     
  6. maconhadalata

    maconhadalata Light Load Member

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    Dec 11, 2014
    newark, nj
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    replaced the egr and tube and gasket anyway when wot egr must be closed and wouldnt leak
     
  7. maconhadalata

    maconhadalata Light Load Member

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    Dec 11, 2014
    newark, nj
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    no codes mufler is almost new
     
  8. nasriza

    nasriza Road Train Member

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    Feb 1, 2013
    Chicago, IL
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    Check on the output of turbo u have two big orange o rings the connect to the down boost pipe put hands around leaking from there probably or maybe you're exhaust brake is getting stuck
     
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  9. maconhadalata

    maconhadalata Light Load Member

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    Dec 11, 2014
    newark, nj
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    Thanks. Forgot to mention that. First thing i replaced was those 2 o rings. Tomorrow im getting my truck. Installed a heavy duty air charge cooler. Ill test and see.
     
  10. maconhadalata

    maconhadalata Light Load Member

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    Dec 11, 2014
    newark, nj
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    After replacing intercooler, valve adjustment, exhaust etc. empty im making 7.2. With. 38000 load barely making 6.
     
  11. maconhadalata

    maconhadalata Light Load Member

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    Dec 11, 2014
    newark, nj
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    And still have the #### air leak noise. Empty from nj to oh 7.2 mpg from oh to sc 38 k load 6.1. From sc to pa 39k load. 6.0
     
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