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CEL after Doug Thorley Install + Way too loud. Help!

Discussion in 'Performance and Tuning' started by sonomacoma, Feb 3, 2011.

  1. Feb 3, 2011 at 12:44 PM
    #1
    sonomacoma

    sonomacoma [OP] Member

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    JB
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    DTLTH
    After DTLT install on 07 4.0L I keep throwing a CEL with code P0402. O2 sims also installed but still throwing CEL code P0402. The code translation is: Excessive EGR flow.

    My question is this, even though I keep clearing the code with my scanguage, will the ECU eventually learn that the new EGR flow is normal and adjust itself accordingly?

    Also, running DTLT's, custom y-pipe that deleted the secondary cats and a Dynomax Straight thru 2 into 1, 18" muffler. It's sounds like I'm running it with open headers. You can litteraly roll a marble down the header and it would drop out the muffler without stopping. Way to f'n loud and tinny sounding. Any suggestions on another muffler that may give a little quieter, lower rumble and not sound so raspy. Thanks all.
     
  2. Feb 3, 2011 at 12:52 PM
    #2
    outlaw7

    outlaw7 Well-Known Member

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    which y pipe are you running? you might want to add a second mufller to your cat back.
     
  3. Feb 3, 2011 at 12:58 PM
    #3
    Chris(NJ)

    Chris(NJ) Well-Known Member

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    Or a resonator.
     
  4. Feb 3, 2011 at 1:05 PM
    #4
    memario1214

    memario1214 Vivid Illumination Vendor

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    I highly recommend a resonator... especially if you're getting bad rasp. I am guessing somewhere in the 18" range...
     
  5. Feb 3, 2011 at 1:10 PM
    #5
    sonomacoma

    sonomacoma [OP] Member

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    Custom y-pipe that deleted the secondary cats and tucked up a little further in front of the transfer case to keep the whole exhaust system above the frame rails. So there are no cats anywhere in the system. Headers to straight 2 3/4 y-pipe to muffler to tailpipe ending before rear axle. I think I went too far. :)
    I'm just going to have to try a different muffler, flowmaster or something to quiet it down. If it were 20% quieter, it would be perfect.
     
  6. Feb 3, 2011 at 5:27 PM
    #6
    roxspin72

    roxspin72 Enjoying my addiction

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    Oh Yeah!!!
    and/or,,, is your O2 sim correctly installed?

    I have the APR X-1 controller, it does not read the rear sensors therefore no codes... But, I once forgot to plug back in the rear sensors and threw a similar code.

    Try rechecking all your conections, then disconnect the neg battery cable for 10-30 min. Re-attatch, and see if CEL pops up again 50-100 mile down the line.

    As far as Sound, you should've known that all CATs removed would = LOUD!!!

    j/k... But yeah try the second muffler or resonator. I opted to go back to stock Y-pipe. But now that im Boosted, im looking at runing a test pipe again; and will be running an 18" resonator in front of the Banks muffler.

    Good luck, and congrats on the headers...
     
  7. Feb 3, 2011 at 5:31 PM
    #7
    MotoXdoer

    MotoXdoer taco?

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    or you overtightend and broke a 02 sensor
     
  8. Feb 3, 2011 at 8:28 PM
    #8
    06HAOLE

    06HAOLE Well-Known Member

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    I had this issue as well with same headers and y pipe. One of the 02 sensors on the headers wasn't plugged in well so check everything. I also went back to stock headers and y pipe. Sound and smell made me go back to stock.
     
  9. Feb 3, 2011 at 10:34 PM
    #9
    sonomacoma

    sonomacoma [OP] Member

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    DTLTH
    Thanks all for the responses. Putting resonator(s) on Monday. That should do the trick.

    Btw..the code i was throwing was P0420...catalyst problem, not P0402...EGR flow...my bad. I'll try unhooking the batt for 30 mins and see how it goes. At least it's not another issue. I sort of expected the CEL might show up. Thanks again.
     
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