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2009 BUICK ENCLAVE SURGES OR MISSES WHEN GOING UP GRADE OR WHEN YOU ACCELERATE. ANY IDEAS?


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Sounds like you have an engine misfire.
These are most noticed under heavy load such as accelerating up a hill, or light accelerating as trying to pass a vehicle on the highway. A scan of the computer would show what cylinder was misfiring.
Another possibility is a transmission problem, but not as likely.
Either way, if you have under 100k miles, is would be under the factory powertrain / emission warranty.


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File comment: 3.6L ignition coil causing engine misfire.
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Hi all,
Have a 2009 Buick Lacrosse 3.8L that has slight oscillating power surges between 37 and 42mph, with no
driveability issues other than this one and no DTC codes. Graphic monitoring of the engine ignition timing
with Torque software indicates oscillations between 23 and 27 degrees in precise agreement with the power surges.
Lab scope indicates Ignition Control Module (ICM) X3, X18 and camshaft signals to the ICM are within parameters.
IC timing control from the Powertrain Control Module (PCM) to the ICM appear within parameters. Has anyone
experienced this same issue and if so were you able determine a solution?


   
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does your scanner have a misfire counter?


   
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