Question about 1991 Buick Century

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Car does not start after it warms up, but starts just fine when its cold

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  • 766 Answers

Check the crank and cam sensors. These devices can fail with age and exposure to repeated temperature changes. First check the electrical connections and wiring to them. Then remove each in turn, clean and physically inspect them for signs of cracking or distortion. To check them electrically is difficult as they need an oscilloscope to read them properly. If they have not been changed after 19 years it might be no bad thing to think of doing it, even if swapping them in turn with second hand units just to confirm the diagnosis before committing to buying new

Posted on Sep 09, 2010

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  • 2 Answers

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Posted on Jan 02, 2017

leetamara
  • 702 Answers

SOURCE: will not start when engine warm

Sounds more like your ignition module is getting hot and not working. I'd go there first before replacing the ECM. You can remove the ignition module and most NAPA stores have the ability to test them for you. Make sure they test it at least 5 times. This way it'll simulate starting and stopping.

Posted on Jul 23, 2008

  • 1 Answer

SOURCE: Car will not start when cold on first try

its the passlock system. The passlock wire is tiny and fragile, and gets disrupted causing your car to think you are trying to steal it everytime you put your key in.

now you can search for this video on youtube, this is where i learned and ever since i did this i have had NO problem with my car starting for the past 5 months.

you need wire nuts, wire cutters, electrical tape, n socket wrench to take apart steering column

first, go to your fuses, find the airbag fuse and remove it just incase you snip the wrong wire. what you do is look below your steering wheel and take your steering column apart. there are a serious of wires electrical taped together that are plugged in. you peel all the electrical tape back exposing the wires, and you find the WHITE wire. its all white, no other color. This wire is for your Passlock system.... this is the wire that got faulty and is causing the car not to start. now what you do from here is kinda tricky, not too bad though.

Seclude the white wire from the rest, so that you are ready to make your cut. Now, what you do is start your car, leave it running, and while its running you cut the white wire in half. then after cutting the wire, turn your car off, and then turn it back on. it should start right up. Then just put wire nuts on the two ends, and electrical tape them back together

The point of doing this is, one is disables the passlock system completely, and two the reason why you do this while the car is running is because snipping the wire with the car running makes the car think that it got into an accident or something, and puts the BCM/car into a "Fail-safe" mode, making it start every single time no matter what.

i thought this sounded insane at first, but after searching for a couple of hours its the only answer that made sense. and now i am the happiest camper in the world as far as it starting

Posted on Mar 12, 2009

mecanica03
  • 881 Answers

SOURCE: 100 series landy diesel. starts fine cold but not when it is warm

check ignition timing , maybe is advance

Posted on Jul 08, 2009

  • 60 Answers

SOURCE: 1991 chevy lumina 3.1 starts cold but when warm shuts off

replace the ignition control module.

Posted on Aug 18, 2009

  • 1 Answer

SOURCE: from cold start my renault megane starts to over reving

Having exactly the same problem with my megane and the mechanic just charged me £687.00 and does not know what to do!!!

Posted on Dec 20, 2009

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2002 Ford Mustang GT, CAR STARTS UP FINE WHEN COLD. Hard to start when warm No Check Engine lights come on.


Think about how the vehicle is acting. Starts fine when cold, hard to start when warm. In these computer operated systems, the computer runs everything. Starts fine when cold: the computer has the engine in cold start mode putting more fuel in till it warms up. Temperature sending unit in the manifold sends a message to the computer telling it to stop the cold start mode and it stops dumping excess fuel into the cylinders and it runs fine. IF, mind you, IF the temperature sending unit is faulty, it's not telling the computer to stop the cold start mode and is flooding the engine with fuel cause it's sill in cold start mode. This is my take away on your situation and the temp sending unit is something to check to be sure it's functional. Check it out. I hope this WAS the answer to your problem my friend. It's typical. Luck to'ya Bro.

Jun 06, 2017 | Ford Cars & Trucks

1 Answer

My 1988toyota hilux 4ycpetrol runs rough when cold but fine when warmed up


The cold start circuit is not working properly. Chances are that the gas or air mixture is not correct when you initially start the car but fine after the engine warms up.

Sep 15, 2016 | Toyota Hilux Cars & Trucks

1 Answer

Starts right up but once it warms up it dies have messed with the air gas screws that's fine don't know what the problem is


My car runs good when it's cold but stalls once it warms up ...

www.badasscars.com/index.cfm/page/ptype...id.../prd289.htm
My car runs good when it's cold but stalls once it warms up? ... In this situation, you can usually re-start the engine once it has hada chance to cool back ... it'll fill-up and exits fuel right up and out the vent tube which dumps it down the middle of ...

Car starts and after warmed up.. it dies!! HELP! - Honda-Tech

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Jun 28, 2010 - Car starts and after warmed up.. it dies! ... but if i let it sits for awhile till the engine is cool down it starts right up but after its warmed up.. it dies.

Troubleshooting an Engine that Stalls at Idle When Warm ...

www.gearheaddiva.com/.../troubleshooting-an-engine-that-stalls-at-idle-...

Dec 21, 2015 | Cars & Trucks

1 Answer

Cool mornings it doesn't want to start ,i have to turn the key to start and let it off several times and it will eventually start after that it starts fine all day and starts fine on warm days


How to Start a Car in Freezing Cold Winter Weather

www.wikihow.com > ... > Cars > Car Maintenance and Repair

wikiHowFreezing cold weather can take a toll on car batteries. ... It's much more difficult to start a cold car with a mostly-empty tank, so do yourself a favor and gas up ...

Why is it so hard to start a car in the winter? - HowStuffWorks

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To start a car in winter, your engine has to work extra hard. Learn the top 3 reasons your car is hard to start in cold winter weather.

Debunking 5 Cold-Weather Car Myths - Popular Mechanics


Nov 21, 2015 | Cars & Trucks

1 Answer

Volvo v40gdi sometimes won't start but starts fine from cold when trying to start it chokes and struggles if I remove air filter assembly it starts fine,


To troubleshoot the issue, click the link below:

Car Repair Diagram

http://technoanswers.blogspot.com/2013/03/car-repair-diagram.html

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HOT/WARM START ISSUE


Its a hot start issue.

Can be related to low fuel pressure or problem with crank sensor.


Also it can be weak battery or starter.


But possibilities are to be inspected to confirm what exactly it is.------


To troubleshoot and confirm the issue,i suggest you refer few solved help links with similar types of problem like yours:------


Click the link below:------


1991 Toyota Trecel: Engine Starts fine but dies when gets Warm?

http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html

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1994 Toyota Pickup: Starts fine but dies in few seconds?


http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html

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1995 Lexus LS400: Running Hot?

http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html

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2002 Toyota Camry: Puff of Blue or White Smoke while Starting?

http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html

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Multiple problems on car: Car runs hot, A/C blows hot and car starts surging?

http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html

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Delay starting on Toyota Prius?


http://schematicsdiagram.blogspot.in/2012/02/delay-starting-on-toyota-prius.html

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Honda car will not start intermittently?

http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html

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Vehicle Starts, Runs and Loses Power

http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html

--------------

Intermittent starting issues on Volvo 760?

http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html

-----------

Car starts and cuts off immediately?

http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html

-----------

Car won't start when cold?

http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html

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These details will help.

Thanks.

Mar 14, 2013 | Cars & Trucks

1 Answer

96 honda civic engine ,starts & runs fine cold-but dies when warmed up


Did you find a fix?
Same problem, wondering how you fixed it?

Mar 07, 2012 | Cars & Trucks

1 Answer

2.0d x-type 2005 Est. Starting problems when engine is warm


Ok, time for car school. The vehicle is operated by the computer, every electrical concept that is. When the engine is cold, it starts fine because the computer has placed it in "cold start mode", putting more fuel into the engine than normally would until Once the engine is warmed up, a temperature sending unit or temp sensor tells the computer to change to normal run mode. IF said temp sensor is faulty and is not telling the computer to make said change, it stays in cold start mode, still dumping excess fuel in the engine that is now not required, cause it's warmed up. Like keeping the choke closed on older vehicles. Now I think you can answer your own question, when this no start action is happening after warm up and it always starts fine when cold, what's the first thing you check ? Right, the unsuspected temp sensor. Change that and no more start problem. Have a wonderful day. Glad I could be of service.

Jul 11, 2017 | 2005 Jaguar X-Type

1 Answer

When the car is warm after a while it is hard to start, takes a few cranks. when it starts it smells like fuel. on cold start it is fine.


Kinda sounds like the ECM or "start mixture" control module is faulty or is getting a bad input from a sensor. For example, it man not be getting a proper temperature sense from the exhaust manifold or the intake manifold water temp sensor. So, every start seems like a cold start....

If your cold start is on a "cold" engine - fine. If your cold start is on a "warm" engine - problem. Mixture is too rich for a warm engine.

Again, could be sensor sending a bad temp signal... or the control module not responding to the signal.

A bit too complicated a problem to exactly troubleshoot via long distance... but you now have a starting point.... -Jim

Oct 23, 2009 | Chevrolet Suburban 2500 Cars & Trucks

2 Answers

4 cyl Engine starts and idles ok...give it throttle and it dies


I need to get a clear mental picture of what exactly is happening.

With this said, you stated that the car "runs fine" until warmed up.

Q: When you start the car when cold it idles fine?
Q: If you allow the car to idle until "fully" warmed does the car stall?
Q: As the car begins to warm up, Does the RPM fluctuate abnormally?
Q: Does the car Only stall when you press on the gas pedal or does it stall just sitting and idling in addition to pressing the gas pedal?
Q: If you can drive it while cold does the car stall during acceleration when warm or only at Stop Signs / Lights?
Q: If you wait 20min or so, can you start the car again?
Q: How many miles are on the car?

Mar 27, 2009 | 1995 Toyota Camry

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