Question about 1991 Buick Century
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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Posted on Jan 02, 2017
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
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
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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troubleshoot the issue, click the link below:
Car Repair Diagram
HOT/WARM START ISSUE
a hot start issue.
be related to low fuel pressure or problem with crank sensor.
it can be weak battery or starter.
possibilities are to be inspected to confirm what exactly it is.------
troubleshoot and confirm the issue,i suggest you refer few solved help links
with similar types of problem like yours:------
the link below:------
details will help.
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