Buick Lesabre 98 Unstable

Manual-Mecanica
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14 years 3 weeks before #28739 by manual-mecanica

1998 Buick LeSabre - Unstable - Posted by manual-mecanica

My Buick Lesabre is unstable in minimal move, I already changed teaching module, verify maf and throtle sensors, and all well .. What notices that the brake sometimes gets hard, will it be empty problem?

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14 years 3 weeks before #28742 by manual-mecanica

Manual-mechanics response on the topic Re: Unstable 1998 Buick LeSabre

It could be a problem with the servo, but first I recommend cleaning the intake manifold and the IAC valve. If it doesn't have one, clean the throttle body and the electronic throttle. Obviously, check the air filter first.

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14 years 3 weeks before #28860 by manual-mecanica

Manual-mechanics response on the topic Re: Unstable 1998 Buick LeSabre

Thanks for the comment. It seems the problem is with the fuel pump; it's not delivering the correct pressure, which is why it's losing power. As a result, the engine isn't able to generate the necessary vacuum, which is why the brakes get hard at idle

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