1994 SL1 Pulsing at cruise speeds

Discussion in 'Saturn S-series' started by Chris, Jun 4, 2004.

  1. Chris

    Chris Guest

    I have a 1994 SL1, when I'm cruising down the road - foot at one spot on the
    pedal (say holding 30 mph) the car surges almost like it's getting fuel then
    not. When I've got the pedal down and accelerating hard, it's no problem.

    Have replaced the spark plugs, spark plug leads, fuel filter, PCV Valve.

    Could this be a faulty throttle position sensor or am I way off?

    Any suggestions?


    1994 SL1 / 1.9 SOHC / 32 Hamsterpower
    Chris, Jun 4, 2004
  2. EGR

    Larry Zerega Jr, Jun 4, 2004
  3. Chris

    Mike Guest

    Check EGR for vacuum line leak, EGR diaphragm leak and sticky valve poppet.
    Mike, Jun 5, 2004
  4. Chris

    K Hardy Guest

    I had a similar surging problem in my '92 SL1 that got real bad. It
    turned out that the body control computer (it's under the emergency
    brake lever) had a cracked case and soda had spilled on it. Cleaned the
    circuit board off and the problem was fixed. I'm still not exactly sure
    why that caused the problem.

    K Hardy, Aug 2, 2004
  5. Check your EGR valve. It can cause surging at low speed conditions. I
    don't remember if the '94 has a vacuum EGR or not. If it's vacuum, try
    driving with the vacuum feed to the valve top disconnected (and plugged at
    the hose end) to see if the problem goes away.
    Gary DelGrego, Aug 11, 2004
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