Question about 1987 Buick LeSabre
Please check the following.
Check Spark at the plugs. (all of them)
Fuel filter not clogged.
Choke working properly.
Rev the engine while shooting carb cleaner through all the ports.
pull and clean and check your mixture screws. (Remember to EXACTLY count the turns out and go back in the same). See if this helps. Mike
Posted on Mar 29, 2015
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Posted on Jan 02, 2017
definatly crankshaft position sensor, had same problem hour ago and changed it and started right up.. crankshaft positions sensors are known to cause this problem, stays open circuit when hot.
Posted on Jul 12, 2009
Your not going to like this but, it sounds like you have a broken Timing Chain/belt but it could be that coil pack not firing. Check to see if you have fire at teh number one spark plug. If you do most likely the timing belt broke. You can remove one of the valve covers and watch the valves. If they don't open and close as you crank the motor then the timing belt is definitely broken if they do you will have to start going through all the other possibilities. The ignition relay being the first. There is a fuse in the interior fuse panel that will cause this as well. If it goes out the vehicle will crank all day but never fire. usually if you have a problem with that fuse it's because of a wire coming lose that was spliced into the panel for an amplifier or alarm and causing a short.
Posted on May 03, 2011
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The steps I'm going to outline are the same as we use in my shop for hesitation, sag and stumble.
All of the tools required can be borrowed from AutoZone at NO COST!
The sensors can be checked with an OBD-II code scanner borrowed from AutoZone. Pay special attention to an TP (Throttle Position) warnings. The sensor can be manually checked for binding or sticking.
Check the Heated Oxygen Sensor (HO2S) found near the firewall and screwed into the exhaust manifold for signs of corrosion on the threads. That will cause a faulty ground.
Here's a little general information that will assist you in comprehending the readouts from the code scanner. This is simply for your edification. You may be aware of all this but we've never done business before and all assumptions are off the table.
For an engine - make that any engine and irrespective of manufacturer - to run, you need three things to happen inside the engine, compression, fuel and ignition, without any one of these components the engine will not run.
If Your Engine Cranks but Does Not Start Follow this Troubleshooting Guide (This doesn't necessarily pertain to you but it's useful to know)
Most vehicles operate by the same principle; basic troubleshooting procedures apply to most cars.
The reason you should repair non-related codes after the engine is running is because sometimes false codes can be triggered by the engine not running. Once the engine is running again the code present might cycle and turn itself off. You might say "if the engine doesn't run shouldn't it have a trouble code?" Sometimes conditions occur that will not be detected by the computer, example: if the fuel pump fails the computer cannot detect the failure, so the engine doesn't start and the computer thinks everything is okay with no codes. If no trouble codes are present proceed to the next step.
Unfortunately, space does not permit me to guide you through the remedy for every code. However, the Wells Company offers extensive code diagnosis application information and technical support via its Tech Line at 1-800-558-9770, as well as in-depth product and repair videos at www.repairpath.com (use my personal access code carrepair) and through the "Wellstech" channel at www.YouTube.com
Posted on Jun 18, 2011
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