DPFE and PCV Repair

Discussion in 'V8 Discussion' started by Thub, Mar 19, 2021.

  1. Thub

    Thub New Member

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    Looking for some opinions on repair or alteration to the EGR/DPFE and PCV system on the V8.

    So the entire upper intake and surge tank are out of the way for cleaning and repair of the IMRC/dirty secondaries. Short story, the back of the DPFE sensor was completely melted and one hose wasn't connected to it. PCV hoses from the valve to the surge tank cracked and broke apart as well as the end of the hose from the oil separator where the valve sits.

    Now the car does have a SCT tune and doesn't throw codes for disconnected SAI so I am assuming it didn't throw a code for the melted DPFE. I didn't look close but the EGR port might have been clogged in the surge tank as well. I'm kinda operating under the assumption that the tune is eliminating any emissions related codes from popping up.

    Now for the solution. Do I replace the DPFE and hook everything back up like it should be or can I rig this up to totally delete the EGR system and just cap off all the little vacuum lines?

    As far as the PCV goes, can I pull the lower intake and replace that hose to the oil separator or is it inaccessible like on the Duratec 30? Rig up some sort of hose to hose connection for the valve to sit in and then reconnect to the the intake? Or would it be easier to run a slobber tube down the block and eliminate the PCV and just let it VTA, and plug the line on the surge tank? Just like most older diesel engines.

    Looking for some more experienced opinions with this before I make a decision.
     
  2. E1

    E1 Crash Tested

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    PCV is good for our engines, it helps seat the rings among other things.

    That hose on the oil separator is hard and the ends are different sizes. Impossible to source and a PITA to fabricate because of tight routing.

    If the intake hasn't been cleaned in say more than 25,000 miles then chances are the port is at least mostly clogged.

    With the SCT you can do pretty much whatever you want. EGR delete is fine.

    Oh yeah - I you need parts, I'm sure I have them around here somewhere...
     
  3. 99sho-time

    99sho-time SHO Member

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    Sounds like your not sure whats in the tune. I'd check and see if the EGR system isn't disabled by driving around with the vacuum line unplug from the top of the egr valve

    As for as the pcv system it wouldn't a be a bad idea at all to get to the oil separating box remove and give it a good cleaning. I do have a catch can which catches alot but I think catch can only do so much.

    I often thought what if i hooked some sort of a vacuum pump to the PCV hose instead of a valve or having the intake suck on it. but that seems more involved.

    Like E1 said. Keeping vacuum on the crank case is a really good thing.
     
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  4. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    Sorry for this question but is the oil separating box is there from factory or it's an upgrade too ?

    Also, if I'm correct, the DPFE is the rectangular box behind the surge tank. (?) If yes, the 96-97 is made from aluminium and the 98-99 is made from black plastic. Maybe they could be switched for more a more solid one ? It's the same part on SLOs.
     
  5. 99sho-time

    99sho-time SHO Member

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    i think all the dpfe's were aluminum my 99 had an aluminum one. The oil separator box comes on all the motors it sits right above the balance shaft bolts to the block between the knock sensors. My egr has been disabled for a long time I never could figure out why mine causes starting issues.
     
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  6. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    Yeah, for the DPFE I just see it on photo elsewhere. Thanks for the info on oil sep. Could it be good to clean it sometime ? I never dug to reach that place until now but i have to replace the small Y in the coolant hoses behind the power steering.

    Your EGR was causing starting issues because it was very dirty or because of a tune ?
     
  7. 99sho-time

    99sho-time SHO Member

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    I was never able to determine the issue it existed in stock tune.. I'd say if you ever had to remove the lower intake it would be a wise decision to remove that oil separator box and clean it.

    I never cleaned the oil separator box on my current running engine i came to the conclusion of them needing a clean when i picked up a 165mile motor for parts. I noticed that box was extremely dirty to the point of restriction.
     
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  8. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    Noticed. Thanks another time for the info. :)
     
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  9. gamefanatic

    gamefanatic SHO Member

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    What are you referring too when you say "oil separator box"? I'm not familiar with that...
     
  10. 99sho-time

    99sho-time SHO Member

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    It's a box that sits between the cylinder heads it has a baffle in it before the pcv valve. it's the box the pcv connects to
     
  11. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    Here it is. (If I understood correctly.)
    shov8-10 oil separator.jpg

    Not sure how to unbolt and clean it however...
     
  12. 99sho-time

    99sho-time SHO Member

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    Yeah that's it but I may have been sorely mistaken I'm not sure you can get that out with the heads on. Ive never tried it. now that im look at the engine on the stand.
     
  13. GEN 3 SHO FAN

    GEN 3 SHO FAN SHO Member

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    Yes, I was wondering how to retreive it also... I think then I will reach my "high risk failure Y" by unbolting the power steering...

    Thanks for the precision by the way. :)
     

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