Question about Buick LeSabre

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Currently not starting, when it did start the last 6-10 times I would reach 40 and it would start to wobble real bad and I let off the gas same thing constantly, and now it wont start

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First change the fuel filter it may be clogged second check for fuel pressure at the fuel rail which runs along the top of the motor, look for the cap to the access valve unscrew and press on the inside of valve like you would if you were going to deflate a bicycle tube to see if gas squirts out, be sure to wear safety glasses and only press momentarily and quickly and also do this check with the ignition key on with engine cool. If no gas squirts out the fuel pump is bad. If gas squirts out the problem is most likely not a fuel delivery issue however the professional way to check is to screw on a 60 psi rated fuel pressure gauge and check to see if a minimun of 30 psi is present as key is turn on if not replace fuel pump. That check was for fuel now you must ascertain whether you have a faulty ignition pull out a spark plug and inspect it the plug should be tan in color if it is black it is most likely an ignition issue depending on what year it is the problem could be a bad ignition module or bad coil, if the car has a distributor replace the cap and rotor first along with spark plug wires. if it has individual coils pullout the spark plugs and correlate the fouled or black plugs with the coil the plug is associated with replacing the coil for that plug. Diagnosis of the ignition system in the absence of certain test equipment can be a slow and monotonous undertaking requiring patience and perseverance, the last thing to replace in this cae would be the ignition control module and before replacing that check to be sure 12 volts is present at the plug to the distributor or coil.

Posted on Dec 11, 2009

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