Question about 2000 Buick LeSabre

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The engine runs rough and periodically stalls upon engagement, not while in P or N. Spark plugs, wires, ignition coils, and the module have all been replaced to no avail. Last week we took it to a mechanic and he could not determine the cause. The diagnostic code showed faulty ignition timing. I finally took it home to try to fix it myself. What gives?!

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Try unplugging the mass air flow sensor or tapping on it when it is running and listen for idle changes.The mass air flow sensor is located on top of the throttle body and is a rectangle held in place by tamper proof torx screws.If you unplug this the engine light will come on but if it stays running while driving then you can be pretty certain this is causing a problem.

Posted on Jul 12, 2010

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97 olds 88 runs rough first few seconds, when you shut it off it will not crank. Had the ignition control module tested and says that it is good. Any ideas?


Will not crank how ? When you turn the key to the start position does the starter engage and spin the engine ? , A crank no start condition . Or nothing happens . A no crank - no start condition . I assume by your statement ( Had ignition control module tested ) That you have a crank no start condition . in which case have you tested input from the crank sensors to the ICM and PCM . What engine does your Old's have ? 3.8 L
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Saturn S series runs rough


It is very common on ALL SATURN S series vehicle for ignition module failure. Usually the symptons are running rough and possibly a check engine light with misfire codes-P0300,P0301,P0302,P0303,P0304.
Some people have attampted replacing plugs and wires,even coils and continually have the problem reoccuring. What happens is the ignition module bolts(x4) stretch out through time and corrosion builds up underneath the module causing incorrect spark displacement. In turn this damages the plug wires and even at times the plugs. What needs to be done is replacing plug wires, plugs if needed, the ignition module bolts(saturn dealer item only)and the ignition module-NOT JUST THE COILS.
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1 Answer

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The car idles rough at low idle speed approx 1000 rpm or less it smoothes out at about 1200. once engage the drive train it realy miss and stalls and it doesnt matter if it forward or reverse it stall and...


You probably are developing serious ignition problems.Your coil pack may be becoming in jeopardy as open plugs wires will re-route KV's straight through the module to ground as this high energy goes to the easiest path. I would isolate possible dropping cyclinders by pulling ignition wires while looking for corrosion on the coil ends and oil soaked or faulty(cracked) spark plugs on the engine/spark plug side of the wires.The upper engine mount(torque axis) may be sagging and will exaserbate this condition as well.Here are 4 possible parts that could get you feeling brand new

1-16167763 -coil module
1-21024814-plug wire set
4-21025103-spark plugs
*1-21022185-torque axis mount with 3 studs(11518883)

*optional

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