1995 Oldsmobile Cutlass Supreme Bucking

1995 OLDSMOBILE
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TWRAUCH
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  • 1 POST
[b:6924c4ae35]95 Oldsmobile Cutlass Supreme 3.1L Sedan, 135K miles[/b:6924c4ae35]. Car hesitates, bucks, and surges at about 30 mph when accelerating from a stop, especially with A/C on until you get up to cruising speed, and then it seems fine. Very annoying at stop lights/signs. It hesitates and surges unless you rev it and really give it the gas. Changed fuel filter, air filter, plugs, and wires - still surge and bucks. Went on a fairly long trip (2000 miles round trip), and my highway fuel economy has dropped from about 29mpg to about 25mpg.
Aug 14, 2006 at 8:06 AM
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MIKEYBDMAN
  • ✓Experienced Mechanic
  • 623 POSTS
[quote:811064b388="twrauch"][b:811064b388]95 Oldsmobile Cutlass Supreme 3.1L Sedan, 135K miles[/b:811064b388]. Car hesitates, bucks, and surges at about 30 mph when accelerating from a stop, especially with A/C on until you get up to cruising speed, and then it seems fine. Very annoying at stop lights/signs. It hesitates and surges unless you rev it and really give it the gas. Changed fuel filter, air filter, plugs, and wires - still surge and bucks. Went on a fairly long trip (2000 miles round trip), and my highway fuel economy has dropped from about 29mpg to about 25mpg.[/quote:811064b388]

No engine codes? Sounds like something is having the computer run it rich. I would have the fuel pressure system checked. Maybe you have a faulty pressure regulator.
Aug 14, 2006 at 9:18 AM
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Suggested Repair

Check the fuel pressure system, including a possible faulty fuel pressure regulator that may be causing a rich condition. Confirm whether any engine codes are present.

Conversation Summary

A 1995 Oldsmobile Cutlass Supreme 3.1L with 135,000 miles hesitates, bucks, and surges around 30 mph when accelerating from a stop, especially with the A/C on, then runs normally at cruising speed. Fuel filter, air filter, plugs, and wires were replaced without fixing it, and highway fuel economy dropped from about 29 to 25 mpg. The expert suggested the computer may be running the engine rich and recommended checking fuel pressure, particularly a faulty pressure regulator.

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