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  1. #1

    Join Date
    12 Aug 2017
    Location
    Central Florida
    Posts
    3
    Saab(s)
    1987 900 SPG
    Thumbs Up:   0

    Car stumbles at constant speed

    Hi. My first post for 87 900 SPG. While driving at steady speed, not accelerating or slowing down the car stumbles. In lower gears it kind of feals like when you are first learning to drive a stick and you don't give it enough gas and the car starts bucking. As soon as I give it more gas it stops and takes off. It does this in all gears but doesn't buck in high gears just stumbles. Runs fine at idle. Any ideas on where I should start would be great.

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  2. #2
    Saab Nut Digger's Avatar
    Join Date
    28 Oct 2016
    Location
    Minneapolis Minnesota
    Posts
    294
    Saab(s)
    2006 9-3 Wagon
    Thumbs Up:   66
    Could be a dirty throttle body but this sounds more like a good old fashion throttle position sensor problem. The car is 30 years old and if it's got the original sensor just replace the sensor and clean the throttle body before you go looking for anything else.

    If the sensor is fairly new and cleaning the throttle body didn't get you running smooth call back and I'll talk you through testing the TPS.

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  3. #3
    Paul A
    Saab Enthusiast
    Join Date
    11 Mar 2011
    Location
    West London and Wiltshire, UK
    Posts
    248
    Saab(s)
    T16 '93 Ruby - T16 '94 Vert Ruby
    Thumbs Up:   0
    I wouldn't guess at TPS. Sounds like ignition to to me. I would try new plugs for a start.

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  4. #4

    Join Date
    12 Aug 2017
    Location
    Central Florida
    Posts
    3
    Saab(s)
    1987 900 SPG
    Thumbs Up:   0
    Thank you for info. I will get a chance to work on it this weekend. Had to work last weekend. I will keep u posted.

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  5. #5

    Join Date
    12 Aug 2017
    Location
    Central Florida
    Posts
    3
    Saab(s)
    1987 900 SPG
    Thumbs Up:   0
    It was Throttle position sensor. Thank you

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