89 deville shifting up down quick and then shut off?
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 89 deville shifting up down quick and then shut off? in Past Cadillac Vehicle Discussion; I bought another 89 coupe deville 120k a week ago and did a tune up including the transmission filter and ...
  1. #1
    1skg's Avatar
    1skg is offline Cadillac Owners Member
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    89 deville shifting up down quick and then shut off?

    I bought another 89 coupe deville 120k a week ago and did a tune up including the transmission filter and when driving it for the second time yesterday and as I was on the highway I got up to 65 and had trouble staying there and then getting back to 65, like the engine may have been running high on rpm. So I got off the highway and a little while later I was doing about 40 and it shifted up/down up/down real quick like it was trying to figure out a gear, and when I got to the light it did it again at 20 mph and then just died and gave me a stop engine oil light and battery charge. I pushed into a gas station and checked the fluid which was all on point. So is this a transmission problem and is it something fixable.
    Also I check the fuel center codes and they read strange. one was e52 and one was 344 128

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    Ranger's Avatar
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    Re: 89 deville shifting up down quick and then shut off?

    Codes are meaningless without their definitions.

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    1skg's Avatar
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    Re: 89 deville shifting up down quick and then shut off?

    how do I determine the code definitions? could whats wrong be the transmission modulator?

  5. #4
    Ranger's Avatar
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    Re: 89 deville shifting up down quick and then shut off?

    See the DTC Sticky at the top of the forum page. You want to use the OBDI link.

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    1skg's Avatar
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    Re: 89 deville shifting up down quick and then shut off?

    I tried starting it again today and got it to start but it shut right back off... That isnt a transmission problem is it?

  7. #6
    Ranger's Avatar
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    Re: 89 deville shifting up down quick and then shut off?

    Nope.

  8. #7
    1skg's Avatar
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    Re: 89 deville shifting up down quick and then shut off?

    So pulling the codes just gave e52, and pressing low just gave me a list of p.1.7-p.0.1 which I can find anything on. what is the p.01-p.17 reading

  9. #8
    Ranger's Avatar
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    Re: 89 deville shifting up down quick and then shut off?

    p.01-p.17 looks like parameters, not DTC's.

  10. #9
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: 89 deville shifting up down quick and then shut off?

    Sounds like a dying fuel pump to me. There wouldn't be a code for that anyway so maybe one is all you have. You should try to get the fuel pressure read somewhere or invest in your own gauge.

  11. #10
    limo1 is offline Cadillac Owners Member
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    Re: 89 deville shifting up down quick and then shut off?

    Sounds like the ECM quad driver inside has shorted or got hot this would activate during torque converter lockup it is possible the driver is popped and now is affecting the power supply in the ECM. I recommend replace ECM with a reman or you can open it up and replace the quad driver IC's, also quad driver activates the fuel pump relay. e52 is an ECM memory error code. ECM's are cheap on ebay.
    also check some of the air actuated solenoids for intermittent coil connections this can cause blown quad drivers as well with high EMF kickbacks into the ECM.
    Air bypass solenoids and EVAP solenoid on the canister come to mind.
    If you replace the ECM and not fix these bad connections it will possible blow the new ECM again.
    the vibration of the motor causes the internal coils to make bad connections to the internal pins on the connectors get the soldering iron out.
    corrosion is the enemy.

  12. #11
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: 89 deville shifting up down quick and then shut off?

    I used to have an 89 Olds Calais that used to give me a code for a bad quad driver. I could still drive it fine. Wouldn't a Cadillac give a code for a bad quad driver too?

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