96 Deville Shakes + Flashing SES
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 96 Deville Shakes + Flashing SES in Past Cadillac Vehicle Discussion; Hi guys, So early I replaced my battery, which only had 160 some CCA compared to the 700ish it should ...
  1. #1
    brockweberlcc is offline Cadillac Owners Member
    Automobile(s): 1996 Cadillac Deville
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    96 Deville Shakes + Flashing SES

    Hi guys,

    So early I replaced my battery, which only had 160 some CCA compared to the 700ish it should have. Changed it, and couldn't find a coolant leak via visual inspection, but coolant is going somewhere slowly, its been almost 3 weeks, and I'm starting to notice it getting low (daily drives). But my new problem was a rough start the other day with it shaking (very cold out, like 14 degrees), and I've noticed my SES has been on, its flashed a few times while driving. Thanks for your help guys.

    ----------

    Also, I'll pull my codes this evening when I get home. Should be quite accurate with a battery change 3 weeks ago.

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 96 Deville Shakes + Flashing SES

    A flashing SES light means a misfire has been detected. You'll probably find a P0300 code.

    Disappearing coolant and rough starts are HG symptoms. Are you overheating?

  4. #3
    brockweberlcc is offline Cadillac Owners Member
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    Re: 96 Deville Shakes + Flashing SES

    It has gotten hot, but that was after I realized the car was very low on coolant. I can smell the coolant after driving (around the front of the car), is that typical of a HG symptom?

  5. #4
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 96 Deville Shakes + Flashing SES

    No. If you can smell coolant that is a good thing. It means that the leak is external. Check the radiator side tanks. They tend to crack and seep after many heat/cool cycles. Remember, the front is blocked by the condenser making it hard to see and allowing coolant to evaporate before a drip becomes visible. If you still can't find it, you might try a pressure test.

  6. #5
    brockweberlcc is offline Cadillac Owners Member
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    Re: 96 Deville Shakes + Flashing SES

    Okay, snagged my codes before strolling into work this morning, and help me out here: I had another mis-fire this morning I could feel for the first 1/8 mile. It goes away after that, wondering if that helps at all diagnostically speaking or not?

    96 Deville Codes:

    P0174 System too Lean (Bank 2)
    P0300 Random Misfire
    P0603 Internal Control Module Keep Alive Memory (KAM) Error
    RS0011
    RS0012
    RS0038 - Current

    Does anyone know the RS codes or have a link to find the definitions, they are not able to be found on the sticky. Thanks guys.

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 96 Deville Shakes + Flashing SES

    P0174 is most likely your problem (a vacuum leak).

  8. #7
    brockweberlcc is offline Cadillac Owners Member
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    Re: 96 Deville Shakes + Flashing SES

    Quote Originally Posted by Ranger View Post
    P0174 is most likely your problem (a vacuum leak).
    Hmmmm...What are the most likely areas for this leak? Never experienced this before. It's been really cold lately in the morning and this has been when it occurs, is there a correlation here? Thanks for all your replies!

  9. #8
    Submariner409's Avatar
    Submariner409 is offline If it won't run, slap in a big stereo
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    Re: 96 Deville Shakes + Flashing SES

    Vacuum leak(s) in a Northstar - Any one of the plastic/rubber lines attached to the vacuum side of the throttlebody, and any piece of equipment those lines attach to. The dirty air side of the PCV system - that comes from the right (rear) cam cover and attaches directly to full intake manifold vacuum at the front (passenger end) of the engine. The intake manifold overpressure valve (in your engine, in the front (passenger) end of the intake manifold tunnel).

    Either buy a mechanic's stethoscope at a NAPA or make one out of a Walgreen stethoscope - remove the chest diaphragm and substitute a length of vacuum hose from the Help! racks at any parts store. Use the device to snoop for hissssssses with the engine cover removed, engine idling. Careful - a serpentine belt will grab you or the hose instantly.

  10. #9
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 96 Deville Shakes + Flashing SES

    Quote Originally Posted by brockweberlcc View Post
    Hmmmm...What are the most likely areas for this leak?
    Considering it is for Bank 2, I'd start the search there.

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