Question about 2000 Buick LeSabre

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My car starts rite up then dies after a few minutes.and i just changed my fuel pump and filter and relay and its still doing it what is the problem?

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I cannot tell you what is wrong without diagnosing the problem. However, I can do this:

Let me give you a little "Automotive Technology 101". The first thing you need to do is to check what is missing when the engine dies. A gasoline powered, internal combustion piston engine needs 4 basic things to make it run:

1. Volumetric Efficiency (built into the design of the engine)
2. Air-Fuel Ratio
3. Compression
4. Ignition

Running out and replacing parts without first determining which of these things are missing from the equation is usually a waste of time and money.....your post bears witness to this statement.

The engine will not run at all if there is a serious problem with Volumetric Efficiency, and it takes an engineer to design and fix that anyway. It is not likely to be a compression problem if it starts and runs ok before it dies. So that leaves us with spark and air-fuel ratio.

So the next question is whether it is fuel or spark or BOTH at the same time? There are several things that can possibly affect each of these. Several possibilities can be either verified or eliminated by answering this simple question.

It is important to realize that BOTH of these things (spark and fuel) are controlled by your onboard engine control computer. To attempt to diagnose these things while ignoring the computer that controls them is usually a real EXPENSIVE way to perform this task.

With all that said,
What you need to do is check your fuel system and your ignition system when the engine dies. If the engine does not start right back up after stalling, it makes things a little easier because some "manual" testing can be used to verify a few things.

Check to see if there is spark at the spark plugs. Check to see if there is (A) fuel pressure at the fuel rails and (B) injector pulse at the injectors. This will tell you if it is a fuel "delivery" problem (fuel pump, relay, fuel filter, etc.) or a fuel "injection" problem (computer inputs, injectors, injector circuits, etc.) or if the ignition system is malfunctioning (coils, wires, computer, electrical connectors, security system, etc.).

From the sysmptoms you are describing, it sounds to me like if you were to actually check these things like they SHOULD be checked, you will most likely find that the fuel pressure is within specifications and that you have no injector pulse or spark at the spark plugs.

If this is what you find, then the "most likely" cause of your problem would be a failed crankshaft position sensor, because this will affect BOTH the spark and the injector pulse at the same time.

Proper diagnosis recommended.

Posted on May 07, 2012

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  • dominic May 07, 2012

    thanks ill check into that today and let you know how it goes.the one other thing i also forgot to add is when it stalls out ill wait after like 5 to 10 minutes and it will start rite up then die out after 5 minutes or so.when it dies out it sounds like its running out of gas.thats why i got a new fuel pump and filter and relay.and its still doing the same thing.

  • dttech
    dttech May 08, 2012

    That's OK - live and learn...Chalk-up the cost of the fuel pump to EDUCATION and move on. At least now you know that engine problems are very difficult to diagnose by what it "sounds" like is going on. That is why professional auto repair technicians use things like computer scanners and fuel pressure gauges to PROVE what is wrong before replacing any parts on a customer's vehicle. Customers usually do not take to kindly to paying several hunderd dollars to replace a fuel pump when that is not what is wrong with the car. A good technician will show the customer PROOF that what he is saying is really what is wrong with the vehicle.....not just "it sounds like"....
    One of my pet peves is "show me the numbers". If you say the fuel pump isn't pumping...show me the numbers...what are the fuel pressure readings? If you say the engine is misfiring due to low compression...show me the numbers....what are the compression readings...You tell me the crankshaft position sensor is not working? show me the numbers...what RPM are you reading with the scanner when you are cranking the engine? You tell me the window lift motor is bad....show me the numbers...what are the voltage readings at the window motor electrical connector AND what is the resistance reading on the ground circuit to the window motor?......Etc., Etc., Etc. If you can't show me the numbers, then you have not properly diagnosed the vehicle, even if you ARE "guessing" correctly. (Nothing personal, just a little insight into the mind of a professional auto repair technician).

  • Anonymous Aug 13, 2018

    you just said a lot but haven't said anything....he is getting fuel and the car starts immediately after it died so obviously he does have fuel and spark. He is not a technician and most probably can't afford one so being a good technician as you state you are you should be able to give some kind of advice with or without the numbers. A good technician can diagnose blindfolded buddy.

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My 85 Mazda b2000 had the same thing happen, it would only keep running when the choke was engaged, it would die as soon as it warmed up. I replaced the gas, which was in bad shape since the car was sitting so long on an empty tank "easy since they have a plug on the bottom of the tank" and replaced the fuel filter and it runs like a top.

Posted on Nov 29, 2012

  • bmillar803
    bmillar803 Nov 29, 2012

    My 85 Mazda b2000 had the same thing happen, it would only keep running when the choke was engaged, it would die as soon as it warmed up. I replaced the gas, which was in bad shape since the car was sitting so long on an empty tank "easy since they have a plug on the bottom of the tank" and replaced the fuel filter and it runs like a top.

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Posted on Jan 02, 2017

brian bess

  • 31 Answers

SOURCE: '95 Buick Riviera, SuperCharger. Car won't Start up!

unplug the cam sensor behind the water pump pulley; see if it starts; if it does, shut off engine; replace both cam and crank sensors because crank sensors go out in these engines

Posted on Jul 04, 2010

Anonymous

  • 21 Answers

SOURCE: 1992 buick lesabre starts fine.

You check the coils with a ohm meter. They should 6-8 thousand ohms at the spark plug connections. One lead to one spark plug connection and the other lead to the other . It's not likely a coil for stalling. If coil , Your car can still run on four cylinders. It can be a ignition module. It fails when it gets extremely hot. The module is located under the coils.

Posted on Jul 19, 2008

Anonymous

  • 3 Answers

SOURCE: will start then dies

On the regals they have a ceramic resistor on the passanger side under the fender. It heats up and over time it tends to brake and the wire inside tends to rust away. The fuel pumps run in 2 different speeds. Had the same problem. Dealer only part yet the car would run and you would think it was the fuel pump. Turn the key it kicks on then start and dies out. Ceramic on the pass side would need replaced. It is white about 2-3 inches long or so held on with 2 bolts i do believe. Ill find a bulliten i found online to help me diagnos the problem. :) hopefully this helps someone out instead of spendin $$$ that ya cant afford with the recession eh?

Posted on Apr 01, 2009

bluelightnin

Joseph Dugger

  • 35 Answers

SOURCE: Fuel relay placement 1991 Buick LeSabre. Replaced pump & filter still won't start

Your vehicle's fuel pump relay is located on the relay center, behind the glove box, 2nd column of relays, 2nd one from the top.

Posted on May 23, 2009

c17hydro

Greg Bernett

  • 2989 Answers

SOURCE: I have a 1987 Buick Century. That stalls out

I'm not Roger but can tell you this....if you have a bad crankshaft position sensor or a corrupt ECM....your car will do that.....last things could be the timing belt.

Posted on Dec 04, 2009

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