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Question
I have a 1995 Cadillac sedan deville and here lately,its been sputtering and eventually shutting off completely and after so many minutes of it "resting", I can turn the ignition and it'll fire up just fine only to do it again a few minutes later and it'll continue doing as such until I get where I am going. I can let it set in my driveway over night and it'll drive fine for so long then start the sputtering and stalling as I mentioned above. I even tried berryman b12 in it and let it set in the car over night and the car ran flawlessly for 3 days then started the sputtering and stalling again. I'm getting highly frustrated and am literally about to wash my hands of this car. I've also had different people tell me that it could be the spark plugs and/or wires plus several other folks say it could be this,that and the other.......PLEASE HELP ME!!! I really like this car

Answer
Hello Joe,

Well, I am at a severe disadvantage not being at the vehicle, but I will try to give thoughts that won't waste your money.
It is very common for people to think of required maintenance to the fuel delivery system. When was the last time the fuel filter was replaced?
The quality of gasoline we get is horrible these days. There is a gas station down the street from me that sells their fuel much cheaper than any other. At night one can see a "Clean Fuel" truck by the tanks with a hose going into the tanks. What they are doing is removing the water from the low grade fuel.
Water forms in tanks and wherever stored before delivery from condensation. It is a natural event, but some filling stations use fuel that really is not fit for vehicles. There may also be sediment laying at the bottom of the tanks. The tanks could have leakage underground. Bottom line, if a few filter is not replaced every 10,000 miles or within a year, the driver is on borrowed time.

With this in mind, inside the tank on the sending unit/pump assembly there is a very fine screen known as a sock that can plug, totally shutting off fuel. At this point, I am not telling you to drop the fuel tank and clean it, but what I recommend is changing the filter. After changing the filter, put one can of heat (no more) when you fill the tank. Also put a can of fuel injection cleaner from a parts store.
The heat will take any water out of your tank. The fuel injection cleaner will clean the fuel lines and injectors.
See if that does the trick. This is the very first place I would go.

Good luck!

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Rob Painter

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Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

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Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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