Last post on Sep 24, 2013 at 11:21 AM
You are in the Buick LeSabre
What is this discussion about?
Buick LeSabre, Engine, Sedan
#296 of 305 Re: wont start [kennmcgov]
Aug 03, 2013 (6:25 pm)
Does the Security light come on when you turn the key to ON?
Does it start flashing for 3 minutes? If so, then you know the computer did not read the right resistance for the chip in the key when it's in the lock cylinder.
Search for VATS (vehicle anti theft system) on the internet and how to bypass it. Use an ohmmeter and measure the resistance of the chip in your key. There are lists of the 15 possible resistances that GM used on the net. Get resistors at Radio Shack in pack to put in series to equal that resistance. Solder them together and then solder the ends onto the wires from the computer instead of the key in the lock.
Be sure to cut the wires high up on the steering column to get extra lead to work with. You are looking for the yellow tube that looks solid until it goes to the connector group up on the firewall by the left foot and instead becomes two tiny white wires that go to the pins in the connector.
Search for some articles and videos. Here's one.
#297 of 305 Re: Engine stalls when idle update [tndayo]
Aug 06, 2013 (9:49 am)
I have a 99 Buick Lesabre. I was having the same problem. We were told it was the security system. So we got a new steering column - still happened. Ended up fixing several small stupid things, and it was stillhappening. One day I was stuck, and just started messing with things. I turned the heat/vent on HIGH, started the car and BAM, it worked. The car will be fine for weeks, then do it constantly for a week. And the heater/vent trick works every time. Sometimes I have to do it 2, or 3 times - but it works. Not sure what it is, but whatever, it works! Good luck!
#298 of 305 Re: Engine stalls when idle update [buick1999]
Aug 07, 2013 (5:27 am)
I tried the same thing when my car was having the issue. Turning the heat on high helps the engines air flow in r something like that. It didn't work too well for me too though. I got the problem fixed though. Turned out to be the crank sensor. It only took them a grand later for them to figure it out -_-
#299 of 305 Re: Engine stalls when idle update [tndayo]
Aug 07, 2013 (5:40 am)
So here is another problem that has started, maybe you might know.. The car is chugging HARD, and will stall out of no where. Started the day after a coolant flush. Oh, and PS: I bought the car for 2k about 18 months ago - I've put about 1500 into it. Its ridiculous.
#300 of 305 Re: Engine stalls when idle update [buick1999]
Aug 07, 2013 (6:04 am)
>I bought the car for 2k about 18 months ago - I've put about 1500 into it. Its ridiculous.
When you bought it, what did the mechanic say that you took it to for inspection before purchase? That inspection will tell you likely problems coming ahead for that model.
A prepurchase inspection is really important. You can't trust the used car salesman or lot or curbstone seller to be honest about a vehicle's past and future.
#301 of 305 Buick LeSabre Starts and Then Dies
Sep 16, 2013 (1:58 am)
I have a 1993 Buick LeSabre (150,000 mi.) that has run very well for years. Never stalls. Til now. I was idling the other day and the car died out with black plumes of smoke coming out of the tailpipe. I can restart it, but within seconds the car dies out. The mechanic has tried fixing the problem by replacing the computer. He's tried three so far thinking the first two may be faulty. We tried different keys in the ignition. He's also tried several other "fixes". Now he's going to check the harness wiring. Are there any other things you might suggest? In case this may have any bearing on the problem I want to mention that we recently had a new starter put in. Thanks.
#302 of 305 Re: Buick LeSabre Starts and Then Dies [seltzergal]
Sep 16, 2013 (4:44 am)
If your mechanic is trying different keys as a remedy for black smoke out of the tailpipe, you need a different mechanic.
And insisting that 2 replacement computers must both be bad when they don't fix a symptom is another problem.
Time to move on to a different mechanic.
Also, I'd look for leaking injectors along with the injectors commanded ON all the time to give too much fuel. That might lead back to the drivers in the computer, but I"m not seeing how the current fellow is coming up with computer as the problem.
And I'd check the indicated temperature from the temperature sensor that the onboard computer uses. If it is telling the engine that the temp is COLD, the computer puts too much fuel in and you would be running rich. My scanner can tell me the temperature--your current or future mechanic should have one capable of that. The temperature gauge in the car may give a different reading from another sensor so the computer's temperature gauge needs to be checked.
My places to start would be too look at the fuel pressure regulator on the fuel line that can leak fuel through its diaphragm and suck that leaked fuel into the intake manifold directly, richening the mixture.
I'd also try starting it without the MAF sensor connected. If it runs then, the Mass Airflow Sensor might be bad.
#303 of 305 Re: Buick LeSabre Starts and Then Dies [imidazol97]
Sep 16, 2013 (12:39 pm)
I am going to make sure that what you have suggested gets checked. Thanks so much for the time you took for such a detailed response. I really appreciate it.
#304 of 305 92 buick lesabre
Sep 24, 2013 (8:31 am)
92 buick lesabre with 144k. Doesn't leak oil. The spark plugs are new. Its never happened while driving only when I park turn it off and come back out to start it. And its random but sometimes it will turn over but chug and the whole car shakes and it turns off. I wait 30 mins and itll start up and run fine.and i thought it had something to do with the key cause my chip on my key was worn down so I replaced it. Ran fine for a few days but now its doing it again. Any ideas? Thanks
#305 of 305 Re: 92 buick lesabre [buickjen]
Sep 24, 2013 (11:21 am)
Since you don't mention any running symptoms at any other time, I assume there are no other periods of rough running, stumbling, etc..
My _guess_ would be crankshaft position sensor_. Usually people have the car stall on them and it won't restart for 10 or more minutes until the engine cools and the sensor is able to operate correctly.
Watch the tachometer when it starts to stumble. The tach should go to zero because of the lost signal to the ignition system. Or it will swing wildly from 0 to 500 or more on the cycles where it's catching an electronic signal.
The position sensor (CPS) is under the edge of the harmonic balancer. That is the lower pulley on the engine with the serpentine belt. It has a couple of wires and is about the size of a thumb under the edge of the harmonic balancer.
Your sensor, I believe, has to be positioned using a gauge for the right air gap. Later ones just fit into a positioning hole.
An anecdotal test is to pour cold water on the sensor which cools it down quicker. The magnetic effect returns and if will start the engine. You might carry a thermos of water with you on a trip or a large cup of ice water.
See if you can locate the CPS on the back side lower of the lowest pulley. Engine off, of course...
Could also be the ISC, ignition spark control, under the 3 coils on the front of the engine top. You could also try cooling it with water; water over the coils and the metal unit under them will not hurt anything.