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Posted on Oct 11, 2009
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My 1993 buick lesabre limited is losing power under load.Fuel pump tests good, have had MAF cleaned and changed coil, wires and plugs but still having problem. Had the cam and crankshaft sensors replaced also.

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  • pathon7 Oct 11, 2009

    My 1993 buick lesabre limited is losing power under load.Fuel pump tests good, have had MAF cleaned and changed coil, wires and plugs but still having problem. Had the cam and crankshaft sensors replaced also.this just happened out of the blue

  • pathon7 Oct 11, 2009

    my 1993 buick la sabre sputters andloses power and it smells like unburned gas in the car. i cleaned the air filter and the MAF sensor and added a injector cleaner. Please help me...

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  • Posted on Oct 11, 2009
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I think the compression pressure from each cylinder needs to be checked. There are built-up carbon residues around valve seats causing poor compression hence losing power under load. If this is a case then only a valve job could improve the situation. Depending on the mileage, worn out piston rings could contribute to the reduction of compression ratio, but it can be determined at the time of the valve job. Good luck. 

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  • Posted on Oct 11, 2009
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May be your engine needs overhauling with new rings etc. It is a 16 year old car after all. Does it leave black soot if you accelerate when loaded? Or put a finger in the silencer (when it is cold) and see of it turns out black with oily soot.

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1992 Buick LeSabre starts and dies randomly, I can't figure out what the issue is?
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Add fuel to beyond 1/2 tank.

A weak fuel pump do not like to ran low on gas.


When was the last gas filter and fuel pump change?

90-120,000 miles is the typical change out.

Fuel pump like to quit on a HOT day.

Test the pressure and see is it within specification.


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The system is dependent on the impulses from the crank and cam sensors for ignition to work properly, and the fuel system depends on tach pulses from the ignition in order to dispense fuel. If you lose spark, you lose fuel too. Check the sensors.

If you find my suggestions to be helpful, please share with us some details so that others may benefit from knowing the whole story. Thank you!
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