Question about 1992 Buick LeSabre

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Will not accelerate properly and hesitatesto about 20 mph

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  • ASETechMN Mar 26, 2011

    Does the vehicle seem to lack power at other speeds or just hesitate to go faster than 20 mph?

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1 Answer

Is the exhaust converter original and 19 years old ?

It may be somewhat restricted

Posted on Mar 26, 2011

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Posted on Jan 02, 2017

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1 Answer

What is the drive cycle for a 2003 Nissan Sentra SE?


Take extra caution while performing dirve cycles on public roadways. Drive cycles can be difficult to follow under normal driving conditions. Begin by: - Start the engine. Idle the engine in drive for two and a half minutes with the A/C and rear defroster on. - Turn the A/C and rear defrost off, and accelerate to 55 mph at half throttle. - Hold at a steady speed of 55 mph for three minutes. - Decelerate (coast down) to 20 mph without braking or depressing the clutch. - Accelerate back to 55 to 60 mph at ¾ throttle. - Hold at a steady speed of 55 to 60 mph for five minutes. - Decelerate (coast down) to a stop without braking. If all other emissions systems are functioning properly, completing the drive cycle above will set the "readiness flags" required to pass the smog check. It will not hurt to perform the drive cycle 2 or 3 times before the smog test.

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1 Answer

Will not accelerate past 20 mph/slows/shuts off


Better check your codes again sounds like your converter is plugged up

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My 1997 Jimmy runs fine in idle when I take off the vechile is fine until it reaches 20 mph it won't accelerate and the rpms increase up to 3000 but no speed. What's wrong it's a 4 wheel d


Sounds like 2nd gear in the transmission is slipping. Cars usually shift at 15-20 mph from first to 2nd. First check the trans fluid.

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1 Answer

Will not accelerate past 25 mph


If O2 sensor the car will jump while accelerating. Could be that it is the catalytic convertor. Could be an issue with fuel filter, though unlikely. If its jumpy at 20-25 then I would agree with you.

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1 Answer

Car was not accelerating over 20 mph floored. Now won't start at all.


could be a couple of things try checking your codes for proper diagnostics it can be done at home usung a paper clip look on youtube for video directions

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1 Answer

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Well if you would elaborate some more on what kind of car you have,...that would be helpful as my ESP is very low today....

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