Northstar knock finally gone
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Cadillac STS Forum - 2005 through 2012 Discussion, Northstar knock finally gone in Past Cadillac Vehicle Discussion; After repeated attempts by the dealer to fix the engine clatter /knock with a final diagnosis as exhaust pulses in ...
  1. #1
    neverlateSTS is offline Cadillac Owners Member
    Automobile(s): 2007 STS4
    Join Date
    Feb 2012
    Location
    Florida
    Posts
    43

    Northstar knock finally gone

    After repeated attempts by the dealer to fix the engine clatter /knock with a final diagnosis as exhaust pulses in the exhaust system I decided to trade this car in. I was very disappointed in GM and their customer service excuse board and understand now why the lease program is the best option for these cars. 3 and out is the best way to keep your costs in line. When your warranty is over the magic begins. I still had 27k left in the warranty but timed out by years.
    I did isolate the noise to the right catalytic converter but by this time i was way passed having any interest in this car. I hope all of you have good luck with your cars and enjoy them to their fullest extent. They are very nice riding but once the 70k comes on repairs come fast and expensive. Thanks to all for some interesting reading.New ride is like me blink and you are gone.

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  3. #2
    Mr.electric is offline Cadillac Owners Member
    Automobile(s): 2004 Deville
    Join Date
    Mar 2013
    Posts
    80
    So what is the new ride?

  4. #3
    stevenriz is offline Cadillac Owners Fanatic
    Automobile(s): 2005 STS4 V8 1SG
    Join Date
    Apr 2009
    Location
    Central MA
    Age
    46
    Posts
    249

    Re: Northstar knock finally gone

    at about 80k, my converters started illuminating the engine light. come to find out they are warranted (at least in 2005) for 150k miles. Now tith 130k, I have a slight "knock" when driving 20-30mph with no "force" on the pedal. Just like when coasting. Weird. When I step on it, the knock goes away...

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