Problematic acceleration immediately after heavy breaking.

[alkemist]

Greetings,

1993 Buick Lesabre.


If I apply breaks heavily, whether or not I make a complete stop and then immediately press gas to go forward, the car often struggles for a second or two to start accelerating.

However, if I give it about 2 seconds to relax after beraking, there is no problem with acceleration.

This never happens without heavy breaking before acceleration.

I am wondering what could it be.

Thank you

[HotZ28]

It sounds like fuel starvation. How much gas do you have in the tank when this happens?

[alkemist]

Problem seems to not change with gas tank completely filled up.


There is starvation however, on right turns at less than a 1/4 of gas soemtimes.

[alkemist]

Problem seems to not change with gas tank completely filled up.


There is starvation however, on right turns at less than a 1/4 of gas soemtimes.

[HotZ28]

Have you changed the fuel filter lately?

[maxwedge]

Originally Posted by alkemist

Problem seems to not change with gas tank completely filled up.


There is starvation however, on right turns at less than a 1/4 of gas soemtimes.

Get a fuel pressure gage on it, tape it to the w/s and observe the fp when this occurs.

[alkemist]

Originally Posted by maxwedge

Get a fuel pressure gage on it, tape it to the w/s and observe the fp when this occurs.

I dont understand where I should tape the fuel pressure gage sry


Id like to mention I have Actron OBDII reader scanner. Maybe it might help to diagnose in any way?

[maxwedge]

Originally Posted by alkemist

I dont understand where I should tape the fuel pressure gage sry


Id like to mention I have Actron OBDII reader scanner. Maybe it might help to diagnose in any way?

To the windshield to see the gage when driving.

[Alibi]

I vote clogged fuel filter or faulty fuel pressure regulator, or possibly a dying fuel pump.

[gbeeley]

Originally Posted by alkemist

If I apply breaks heavily, whether or not I make a complete stop and then immediately press gas to go forward, the car often struggles for a second or two to start accelerating.

You might check for a power brake booster vacuum leak:

1 - run vehicle for a short bit.
2 - with foot off brake pedal, turn off engine and wait a few seconds.
3 - push firmly down on brake pedal. You should hear a momentary hiss as the power assist kicks in. Hold it there for a bit.
4 - release brake pedal.
5 - push down brake pedal again, firmly. You should hear the momentary power assist hiss again.
6 - repeat the process. You should get two to three full pushes of the brake pedal before the power assist runs out.

- GB