94 Deville 4.9L stalling, acting like it is running out of gas . No codes.
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 94 Deville 4.9L stalling, acting like it is running out of gas . No codes. in Past Cadillac Vehicle Discussion; I checked the fuel pressure it was between 36 and 42 psi while driving. Around 40 psi when it died ...
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    mluplow is offline Cadillac Owners Member
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    94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    I checked the fuel pressure it was between 36 and 42 psi while driving. Around 40 psi when it died twice at a stop sign. I was checking to see if I had any pressure drop when it hesitated or stalled. It didn't drop. This is an intermittent problem and seems like it happens when it is at operating temp. Only 86K miles on car. Fuel filter was changed (original). The problem started all at once it was not gradual. Any help would be appreciated.

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    Re: Need Help 94 Deville 4.9L stalling, acting like it is running out of gas . No co



    Did it die coming to a stop or while stopped? How much gas was in the tank?

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    mluplow is offline Cadillac Owners Member
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    Re: Need Help 94 Deville 4.9L stalling, acting like it is running out of gas . No co

    It dies both coming to a stop and while stopped. It also will stumble every now and then while giving it gas and has died while braking. Its happened with 10 gallons and less of gas. Thanks

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    Re: Need Help 94 Deville 4.9L stalling, acting like it is running out of gas . No co

    Hmm, if it had 10 gallons (almost 1/2 tank) I think we can rule out the common tank baffle problem. I wonder if maybe it's an intermittent fuel pump.

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    mluplow is offline Cadillac Owners Member
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    Re: Need Help 94 Deville 4.9L stalling, acting like it is running out of gas . No co

    The fuel pressure was 40 psi at the fuel rail when it died two times while driving.

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    Re: Need Help 94 Deville 4.9L stalling, acting like it is running out of gas . No co

    Are you sure this is fuel related and not electrical (ignition)? Have you checked to see if you have spark when it fails?

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    mluplow is offline Cadillac Owners Member
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    Re: Need Help 94 Deville 4.9L stalling, acting like it is running out of gas . No co

    It's possible it's the ignition. I have no way to monitor the spark when it fails (intermittent problem). It also seems like it would throw a code.

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    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: Need Help 94 Deville 4.9L stalling, acting like it is running out of gas . No co

    Does it die quickly like turning off the key or does it blubber for a while like it's choking or does it idle so low it just fades out? FWIW my Deville ran like crap for a couple weeks before I finally got a MAP code. I didn't get the code until it was at the point of stalling at red lights and I was driving with 2 feet. There are thousands of ISC threads here if you want to verify correct operation of that part of the idle equation. I think you will get a code sooner or later if it runs bad enough. It sounds like the fuel pressure is good enough. Do you think the spark plugs and distributor cap are original?

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    mluplow is offline Cadillac Owners Member
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    Re: Need Help 94 Deville 4.9L stalling, acting like it is running out of gas . No co

    It seems like when it dies while stopping or at a light it fades out. Sometimes when accelerating or going up a hill it will blubber. The spark plugs have been changed I don't think the cap has. The cap and rotor looks good to me not much wear or pitting no cracks or carbon traces. I think I will hook up a timing light and route it through the hood and duct tape it to the windshield to see if it is losing a spark when it blubbers or dies.

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    the recluse is offline Cadillac Owners Connoisseur
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    Does it happen all the time, or only when warm?

    Trying to find open or closed loop operation.

    If it happens all the time, I would try looking into the ICM...it controls spark, but is one of the few things not monitored by the computer. The more load you put on it, the worse it gets...the warmer the engine gets, the worse it gets...

    The MAP is the only other things that runs in both closed and open loop operations...

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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    "Dies while stopping, accelerating or going up a hill" all sound like a tank baffle, but it should not happen with 10 gallons of fuel. Generally speaking the baffle problem usually happens with 5 gallons or less while making a turn, but stranger things have happened. Try filling the tank and keep it at 3/4 or better and see if still happens.

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    mluplow is offline Cadillac Owners Member
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    It happens when its warm. I had the same thoughts. I tried a new ICM (cheap enough) and it didn't help. I'll fill the tank and see if that helps. Thanks for everyone's help.

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    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    Check the fuel pressure regulator. Pull off the vacuum hose to see if it is leaking fuel in there.

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    mluplow is offline Cadillac Owners Member
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    The fuel pressure regulator is one of the first things checked. Filled the car up with gas and is still doing the same thing. It only happens when it reaches operating temp. I still haven't hooked up a timing light to see if it is losing spark when it blubbers. Does anyone else know of a way to monitor your ignition to see if it is losing spark (intermittent)? Thanks

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    the recluse is offline Cadillac Owners Connoisseur
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    Re: 94 Deville 4.9L stalling, acting like it is running out of gas . No codes.

    If your ignition is losing spark, the number one place to look is the Hall effect switch in the dizzy...doesn't always throw a code either...if it does it will either be E012 or E041...

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