2005 Buick Park Avenue hesitation

GHWHITE1937

MEMBER
2005 BUICK PARK AVENUE
6 CYL
2WD
AUTOMATIC
107,000 MILES

For the past 8 monhs my car has been hesitating when going up hill at 50 - 60 mph. It runs fine on level road or down hill.

The rpm indicator bounces between 1,500 and 2,000.

If I step down on the gas pedal, it has good pick-up and no hesitation. The problem happens when I have relatively even pressure on the gas pedal.

It only does this when in gear, and runs smoothly when in neutral.

The car had this problem before the 100,000 tune-up, and still does after the tune-up.

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,645 POSTS

Have you checked for vacuum leaks? Is the check engine light on? Has fuel pressure been checked?

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Wednesday, March 17th, 2010 AT 1:44 PM

GHWHITE1937

MEMBER
3 POSTS

The is no engine light. If there had been an engine light, I would have mentioned it.

I would think that fuel pump pressure would manifest itself when accelerating, and not only on inclines. Is that correct?

My first thought was the fuel pump; but, after 8 months, I would wonder why it hasn't gotten any worse.

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Thursday, March 18th, 2010 AT 10:04 AM

JACOBANDNICKOLAS

MECHANIC
109,645 POSTS

Yes and no. Over a longer incline, the pump is required to produce more. However, it could do it on acceleration too, but not always.

Regardless, you seem to feel as if it is ignition related, which I trust because you drive the car. Without a check engine light it becomes a guessing game. If it only happens under a load and on inclines, It could be a crank sensor, plugged EGR, injector. Have any of them been checked?

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Thursday, March 18th, 2010 AT 1:36 PM

GHWHITE1937