Question about 1992 Buick Regal

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92 Buick-On restart, it runs rough and acts like a partial vapor lock action. Always running smooth before shut down. Then, after the restart, it acts also like it's on a cold winter day and trying to go while moving out. Gets real.

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Bad Ignition Module

Posted on Jun 27, 2009

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2003 buick lesabre ac fan runs when car is cut off


How long does it run? The reason I ask is because it is designed to run after engine shut down under certain conditions of temperature to cool down the engine and prevent vapor lock in the fuel rail. If it just stays running all the time after the key is turned off that is of course a problem.

Jun 24, 2016 | 2003 Buick LeSabre

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98 olds bravada. Acts like fuel vapor lock. New pump 1 year new filter 1 month. When it happens outdide temp over 103 and will restart after a few mins.


Do you hear cooling fan coming on ? After you shut the vehicle off the fans will still run for up to seven minutes if hot !

Sep 10, 2015 | Cars & Trucks

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Where do find the vapor lock on my 1999 Buick century


Vapor lock occurs when the gas in a fuel line turns from liquid to vapor, before it reaches the engine. The first signs of vapor lock are normally when your engine begins to run roughly. The engine may sputter and hesitate. It will then stall completely and refuse to restart. It may seem like the car is out of gas or the fuel pump has failed. While these are possibilities, vapor lock may be the problem.

Jan 30, 2015 | Buick Cars & Trucks

1 Answer

A friend has a boat with a 350 Chevy engine that starts, but runs rough at first, then seems to run fine after being warmed up. However, when it is shut off, several times it would not turn over at all and...


most boat engines run under a cover unless they are racing boats and that creates a heated environment to operate in
items such as coils , ignition modules etc are subject to over heating components
from you description it is possible that when shutting down the engine , the heat in the compartment may be causing the coil /ignition module to fail and hinder the restart
indicated by the restart after it cools down and with the rough running when first started ( moisture in the distributor cap)
if it has a carby , could also be suffering from vapor lock in the line to the carby( an inline filter at the carby may reduce that problem) from lack of cooling in the compartment
as a last resort consider ventilation of the compartment to assist with engine area cooling

May 11, 2017 | Cars & Trucks

1 Answer

V6 engine idles rough after restarting, then smooths out


My first guess would be a dirty carb/fuel injector set. Run some fuel cleaner through the tank and see if it gets better. You might have to do it through a couple of tanksful. How long since you've had a tune-up? It might just be that time.

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