91 Buick 3.3L Starts and runs great cold, but dies out after 6 mins

07-11-2010, 04:48 PM
Hello all, i just got this 91 Buick 3.3L off of CL. It has around 190K miles on it, and it was running GREAT for the week that i had it. all fluids are full, and clean and up to date. One day out of the blue, i was accelerating, and about 45MPH it just died out, like i turned off the key... Tried to start it back up, it started for about 2 secs, and died out again, and would NOT start back up... Get it towed back to my house, a couple of hrs later, i try to start it back up, and it fires and runs great again... but after it warms up, around 5-8 mins, it will just cut off, and will not stay running in till you let it cool off. What am i looking at? It will do this cycle all day long. Its getting fuel at the fuel rail...


07-12-2010, 01:56 PM
The long story.

Well i just had another problem happen. Yesterday i was accelerating, about 25% throttle, and about 45MPH the car just flat out stalled, like i turned the key right off. I drove for a about 700Ft and pulled over. I tried to start it, and it would not go, nothing, i thought i ran out of gas, it was at a 1/4th of a tank, but thinking maybe the fuel gauge is off.. So i walked 2 miles back home, grabbed my gas can with about 1.5gal of fuel, and walked back to the car. (This is upstate, NY) I put in the 1.5 gals, got in the car excited thinking im home free, and well guess what? No start..... I hear fuel pump, and also fuel was at the fuel rail. So i get it towed back home, the 2 miles by a friend, let it sit in my drive way for an hr or 2 charging back up the battery, go out, and it starts and runs great... Rev it a couple of times no issues, but after 3-5 mins, i give it gas, it revs to about 2500RPMS, and again its like i turned off the key, stalls right out, and no amount of flooring/pumping will save it. But it starts right back up, but you have to hold your foot on the throttle, just slightly, then if you let up really easy, it will idle down to around 400rpms, then catch its self and rev to the normal. Now i try to move it, and it dies right out, and will not start, just turns over and over and over. I spent about 45Mins trying to move it in to my garage from my drive way... Next morning, i go out, and it starts right up, and runs fine, no foot on throttle, nothing. I let it idle for about 1-2 mins, then take it out for a drive, i give it 75% throttle, and take off, next thing i know is im doing 70. Alright, looking good, while slowing down, less then one min later, i go to make a 90 degree turn right, and she stalls out on me... http://www.buickforums.com/forums/images/smilies/sad.gif Starts right back up, but i have to keep foot on throttle, to keep it running. shift in to get 1, give it around 20% throttle, get moving, to about 25MPH then start going down a hill, and it wants to stall, as in im losing speed, floored, its doing nothing, the road levels out, and i already know it stalled... Thats where im at. ATM with it.

So what should i really be looking at?

Can hear fuel pump, has fuel pressure. runs fantastic for the first 3-5 mins, then stalls once warm, and has trouble staying idling/running. Let it cool off, will do same thing again...

Thanks!! http://www.buickforums.com/forums/images/smilies/biggrin.gif and http://www.buickforums.com/forums/images/smilies/gr_cheers.gif

07-13-2010, 03:21 PM
Typical of a failing fuel pump. They lose pressure as they warm up but work fine after they've cooled down.
Rent/borrow a fuel pressure tester and monitor the pressure when it dies. You don't need to drive it, idling in the driveway should produce the same results.
Another test in a no-start condition is to spray Carb Cleaner directly into the throttle body and see if it fires.

07-13-2010, 04:47 PM
I would bet either the crank positon sensor or ignition module are failing when hot. When the car stalls, check to see if you're getting spark. If not, then you need to have the ignition module tested. If that passes, then the crank sensor is most likely your issue.

07-13-2010, 07:44 PM
Well i do have a couple of videos..

Here is the first one as it was warming up, and you can hear how it just flat out stalls when revved. The knocking is the idler pulley going bad. Also It idles low, so you had to very gingerly let up on the throttle or else it would idle to low and stall. No amount of flooring/pumping will get it to idle back.


This one is just me not being able to get it going again.

Dont know how the starter did not over heat.
The links are safe, and hosted at photobucket.com.

Thanks for the replies.

08-03-2010, 05:17 PM
Here is a youtube video. Much better then me trying to type it out. Thanks.



08-04-2010, 01:47 PM
So today i was again checking my spark, and it seems as i have a weak coil pack. 2 of the coil packs have a nice blue strong spark that will arc over 1 1/2 inches, the 3rd coil pack will will no spark unless you are less then a 1/4 inch away from ground.... Also with a spark plug disconnected on this coil, i feel NO difference. same misfire, stumbling, no power. if i disconnect both spark plugs off this coil pack, i can then hear popping in the intake.... So im off to buy 3 new coil packs. Wish mE LUCK. :us:

08-04-2010, 06:21 PM
Video of Spark issues, tomorrow i will pick up 3 coil packs...

08-05-2010, 08:33 PM
Well!, I replaced 3 coils, and she ran GREAT!, no missing, great power, all of the above... about 15-20 mins pass im driving going back home, and give it a couple WOT runs, and she dies both times, again right at the peak of the wot run like i turned the key off.. But it starts up, and is alright if i do not give more then 75% throttle i would say. About this time i hear the fuel pumping making all kinds of noise, from a very loud hum that you can hear 15 feet away to a weak sounding electric motor... i get back in my driveway and she sputters and then dies like i ran out of gas and will NOT start. I pull out the starting fluid and she fires right up for about 2 secs.... Just for the hell of it, i check for spark, and have 6 NICE blue strong spark that will spark better then 2 inches. Let the car sit for 45 mins, and she starts and purrs nice, but slowly hear the loud hum returning with in a couple of mins. So tomorrow im going to drop the tank, and replace the fuel pump and strainer. I just replaced the fuel filter 15 miles ago.. So hope this will solve all problems.... :disappoin Also should note, i cut open the old filter, and it had very fine metal glitter in it... Very fine, smaller then pepper flakes.

08-06-2010, 10:57 PM
Hey now.. New fuel pump and strainer installed, and she runs great.. had to drop the tank, and boy i dont want to do it again anytime soon. So i had 2 issues... the bad coil packs for the misfire, and a weak fuel pump for the stalling, and not starting unless cooled off.... Happy shes running again. already put 80+ miles on it. :us: thanks again for the ideas.

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