Car is finally fixed - A big thanks to Mark @ D3
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Cadillac STS-V Series Forum Discussion, Car is finally fixed - A big thanks to Mark @ D3 in Cadillac V-Series Forums; After several trips back to the dealership after initially taking it to have the recall done and to fix a ...
  1. #1
    CIWS's Avatar
    CIWS is offline Cadillac Owners 10000+ Posts
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    Car is finally fixed - A big thanks to Mark @ D3

    After several trips back to the dealership after initially taking it to have the recall done and to fix a oil leak coming from the lower crankcase seal on the engine, I finally got the car back on Thursday with all apparent issues finally fixed. Most of the dilemma was posted here in another thread.

    http://www.cadillacforums.com/forums...g-10psi-3.html


    I feel I owe Mark from D3 a big THANK YOU for posting the information he did because most of it appears to have been correct as to what the dealership did to the car to cause it to have an approximately 50whp loss from stock performance. So Mark if you read this Thank You Very Much ! I took the information and pictures you posted in that thread and gave it to the Service Director for the dealership and this seem to help them discover what was done to the car from the initial service visit.
    When they originally pulled the engine to replace the lower crankcase seal they had to pull the supercharger off. It appears they were not careful and "damaged" the cable underneath the supercharger that controls the bypass valve, causing the valve to not stay fully closed and me to be bleeding supercharger air and only getting 8-9psi vs 12psi. So I was never reaching max boost and HP. Before they took the car back to try again I gave them copies of those pics and everything Mark had said/suggested up to that point plus the last dyno run showing it was down 50-60 HP.
    The Service Director told me they did indeed find the valve was not staying fully closed and that they had fixed/recalibrated it. He also said the 2nd oil leak was due to them not putting a front engine seal back on using sealant with the gasket because they felt the gasket was sufficient enough, but after going back and consulting GM they said it needed both. So it was replaced this time with sealant.

    If this does not show any individual owner of a performance car the importance of having a base dyno run on their car, it should. Without the proof of the other dyno run(s) to show what level the car was performing at prior to their work I'm not sure how/if this could have been solved. Because I did give them the car back to look at noting the boost gauge was not showing where it was before and that the car didn't feel as fast, and they said the engine was checked and they did not find anything wrong. "Hell that car will smoke the tires"
    So I'm out the time and effort involved to finally get it corrected plus the cost of two trips to the dyno for runs, but thank the Maker it's fixed. Plus I now know more about my car and it's function as well.

    I took it Saturday for a couple of more pulls on the dyno to confirm it was indeed fixed and back to where it was performance wise. Here's video from that visit. Thanks again Mark

    [YOUTUBE]Hc6QrT8eNMg[/YOUTUBE]

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  3. #2
    stephenstay is offline Cadillac Owners Member
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    Re: Car is finally fixed - A big thanks to Mark @ D3

    Yup, I'm convinced and will be taking my "v" in next week for a baseline dyno. The dealer tech's gathered around my car when I took it in two weeks ago for the first time. They had never seen one and mine is the only one in town.

  4. #3
    PSRmark's Avatar
    PSRmark is offline Cadillac Owners Fanatic
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    Re: Car is finally fixed - A big thanks to Mark @ D3

    Well it's my pleasure to help. I'm glad I was able to lead you and them in the right direction.

  5. #4
    CIWS's Avatar
    CIWS is offline Cadillac Owners 10000+ Posts
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    Re: Car is finally fixed - A big thanks to Mark @ D3

    Quote Originally Posted by d3Mark View Post
    Well it's my pleasure to help. I'm glad I was able to lead you and them in the right direction.
    Thanks Mark


    Minor update. The Service Director has offered to do the next oil change for free to compensate me for the dyno cost. So it can be said they are and have been trying to get me taken care of.

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