2003 STS Idle/MAF/Coolant temp issues/Driving itself - Page 2
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Northstar Engines and System Technical Discussion Discussion, 2003 STS Idle/MAF/Coolant temp issues/Driving itself in Cadillac Engine Technical Discussion; kj, Where are you ?? Do you have the opportunity to get on an Interstate and go for a 120 ...
  1. #16
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2003 STS Idle/MAF/Coolant temp issues/Driving itself

    kj, Where are you ?? Do you have the opportunity to get on an Interstate and go for a 120 mile one-way drive to lunch ?? (You want the engine guts, oil, coolant, fuel system up and running, hot and stabilized for quite a while.)(Best time for an oil/filter change would be at the end of this day.......)

    Long shot......... Find a 20 oz. jug of Chevron TECHRON (a powerful fuel system cleaner) and dump it in with a fillup of Chevron, Shell, EXXON, Texaco, Shell 93 octane gas. Hit the road - do a few WOT's in the process. Lunch. Go back and do it again. Clean fuel and exhaust system.

    Do NOT use seafoam or any other snake oil, and do NOT use concentrated TECHRON any more often than 5,000 miles. Google "top tier gasoline" and "chevron techron" for some reading on a rainy night..............

    You have a rare car - get it back in as-new condition and drive the snot out of it. (Not to be confused with abuse...........)

  2. #17
    kjanks is offline Cadillac Owners Member
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    Re: 2003 STS Idle/MAF/Coolant temp issues/Driving itself

    Hi guys! It's me again.... Sigh. So after replacing the MAF, cat, throttle body and intake manifold gaskets....almost a year later I am finding myself almost back in the same position. I now know I need an O2 sensor but the car is once again having a high idle and coolant temps are irregular and past the 12 o'clock mark. Can O2 sensor also cause the car to act like this?

  3. #18
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2003 STS Idle/MAF/Coolant temp issues/Driving itself

    No, I don't think it should.

  4. #19
    kjanks is offline Cadillac Owners Member
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    Re: 2003 STS Idle/MAF/Coolant temp issues/Driving itself

    Ok so if it is a code of P0420 then can it be a bad o2 sensor?? This code has remained on since i replaced the cat. I don't get it. I really don't want to go to cadillac and spend 500 to solve a simple issue. My next step is putting $60 worth of o2 sensors on this beast. However, i read that if the P0420 code is shown that it means my o2 sensors are fine and infact my CAT is deficient.

    SOMEONE ANYONE??! BUEHLER?!

  5. #20
    crezzy2k1 is offline Cadillac Owners Member
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    Re: 2003 STS Idle/MAF/Coolant temp issues/Driving itself

    If it were an O2 sensor you would have P0135 or something. Do you have an exhaust leak before the after cat o2 sensor as that will also cause a P0420.

    FWIW i just replaced my CAT with an Eastern and it has been fine.

  6. #21
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2003 STS Idle/MAF/Coolant temp issues/Driving itself


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