New 940 Owner - Diagnosing Rough Running

Discussion in 'Volvo 940' started by Drola, Aug 1, 2020.

  1. Drola


    Aug 1, 2020
    Likes Received:
    hello. i just bought a 1995 940 for my niece to learn to drive with.
    the car idles beautifully. but when i give it throttle it sputters like crazy. if i give it almost to full throttle it runs prefect. it's just that mid throttle that runs horrible.
    the guy who sold it to me had recently done the following:
    timing belt
    new plugs, wires, cap and rotor
    fuel lines and fuel filter
    compression test at 170 psi all across
    i did find a couple vacuum leaks and plugged them up. he also put an aftermarket maf sensor. i put the original back on and it runs horribly. i bought a second hand maf and it also runs horrible. so far it runs best with the aftermarket.
    so my question is what should i check, try, test etc to see if i can get this sputter to go away and get the car to run smoothly?
    this is my first volvo and it looks like a really simple motor so it can't be all too difficult to find the problem
    thanks in advance for any suggestions
    Drola, Aug 1, 2020
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