1994 Buick Overheating, stalling

[sthayer]

OK - here is some more info - this is really starting to bug me!!

Replaced all the coils and ignition module, NO CHANGE - I plulled out several spark plug - they are not loosing fire before the engine dies, they are still sparking untill it stopps turning.

Replaced the fuel pump, filter, and relay about 4 months ago.

It starts, runs for about5 seconds, and then shuts off, just like I shut the ignition off.

Could this a problem with the fuel getting cut-off going to the engine, and if so - how do I go about checking to see if thier is still fuel flowing to the engine when it dies?

[sthayer]

OK - have not been able to find anyone to read the caodes, without spending 100 bucks, and the owner of the car will not do that - we replaced the fuel pressure regulator yesterday, still no change - just dies.

So here is what we have replaced at this point:

Coils (all 3)
Egnition Control Module
Crank Position Sensor (both of them)
Fuel Filter
Fuel Preessure Regulater

where do we go from here?:bang head::bang head:

[nuclear_assault]

I have a 1994 Buick Century wagon. It's a 3.1 and it is doing pretty much the same thing. When I let up off of the gas it stalls out. I'm going to start by changing the fuel filter and checking the fuel pump. If that doesn't work I'll crank position sensors. What could any other problems be? Maybe my intake is clogged? The check engine light finally came on today.


I had to replace a crank position sensor on my 1990 Buick Century because it would shut off right away. I guess it's a really common thing, Buicks and their 'Phantom stall'........

[nuclear_assault]

At this moment it's 10:30 at night and I decided to run the car for a bit to see if I could get any more ideas. When I let up off of the gas the car idles really low, almost stalling, and the lights dim, and then it goes back to normal. Any ideas? The car will idle high and then low when I let it sit. It varies very often. I also noticed that my fuel pump hums when I turn the car on like it should, but then after about a minute it starts humming again. My 1990 Volkswagen Golf's fuel pump did the same thing, only the lights didn't dim and the car would choke up before it died out. I replaced the fuel filter and the car ran fine, so I doubt it is the fuel pump or filter this time. I was really thinking it was the crank position sensor (and I'm still not throwing that idea out), but this car isn't overheating like my 1990 Century.


This is a problem among a lot of older Buicks. I'm really suprised nobody has narrowed it down to a couple possible causes. I know I'm completely stumped.

[richtazz]

you need to check for injector pulse when it dies. The injectors on these engines are run in series, so if one heats up and dead shorts, it will kill the signal to the rest. using a DMM, ohm spec each injector and see if one is way off from the others. if there is one off, replace it. If you're losing injector pulse, but they all spec similarly, you may have a bad ECM.

[nuclear_assault]

when they heat up? it does it right when i start up the car

i also have a big hole in my exhaust which probably isnt helping

Originally Posted by richtazz

you need to check for injector pulse when it dies. The injectors on these engines are run in series, so if one heats up and dead shorts, it will kill the signal to the rest. using a DMM, ohm spec each injector and see if one is way off from the others. if there is one off, replace it. If you're losing injector pulse, but they all spec similarly, you may have a bad ECM.