what would make a 2004 Buick lesabre idles smooth runs rough at 4000 rpm

Asked by Jan 10, 2015 at 06:46 PM about the 2004 Buick LeSabre Custom

Question type: General

startup and runs perfect until it is reved up to 4000 rpms and it won't go above 4000
above that

2 Answers

120

could be a faulty coil or ECM.. what does the car do at 4000? stall or change how ir runs all together? Any different noises than before?

75

If I am correct, this car as well as most have rev limiters to avoid possible damage to the engine. The only way to get the rpms higher than 4000 is by driving the car.

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