1998 surging when accelerating

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Northstar Engines and System Technical Discussion Discussion, 1998 surging when accelerating in Cadillac Engine Technical Discussion; My 98 SLS surges during part and wide open throttle. Idle and light highway cruise are smooth as silk. Other ...
  1. #1
    gman89 is offline Cadillac Owners Fanatic
    Join Date
    Jan 2004

    1998 surging when accelerating

    My 98 SLS surges during part and wide open throttle. Idle and light highway cruise are smooth as silk. Other than the surge, power seems ok and gas mileage is good.

    The plugs are new.

    Any ideas?


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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: 1998 surging when accelerating

    Check your fuel pressure under those conditions.

  4. #3
    mcowden is offline Cadillac Owners Connoisseur
    Join Date
    Jun 2003

    Re: 1998 surging when accelerating

    Quote Originally Posted by Ranger
    Check your fuel pressure under those conditions.
    I'm with Ranger... It sounds like fuel pressure might be low under high demand conditions such as acceleration. Once you steady off on the pedal and fuel use is much lower, it's fine. It could point to a clogged fuel filter, a crud-covered screen on the fuel pump, a failing fuel pump, a bad fuel pressure regulator, a vacuum leak, and other things. But, as Ranger said, you should start by checking the fuel pressure while starting and while accelerating.

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