Volvo RWD 900 Forum

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95 960 acceleration flat spot 900 1995

posted by  someone claiming to be steve on  Tue Nov 21 14:07 CST 2000 [RELATED]

65k on car ..have changed computers and tps.with original computer car had flat spot in acceleration between 30-40 mph ..accelerating forcefully results in car going beyond this speed and then smoothing out just fine.replacement used computer caused the same type of problem except that it happens between 60 and 70 mph..checked grounds and vacuam hoses..one mechanic has said the computers for these cars are matched to the speedometer clusters??any advice appreciated.







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    Re: 95 960 acceleration flat spot 900 1995

    posted by  someone claiming to be Jim Bowers on  Wed Nov 22 03:54 CST 2000 [RELATED]

    Is this a new symptom or has it been there all along. Is the "flat spot" at full or partial throttle? Is it related to engine speed or is the transmission also involved.

    Easy things first would be to make sure the fuel system is "clean" by giving it a treatment of Chevron Techron. Then if you think the transmission is involved, a filter change followed by a full flush with synthetic ATF would be in order.

    My manuals are for the '96, which has an all new computer system so I can't add much more.







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      Re: 95 960 acceleration flat spot 900 1995

      posted by  someone claiming to be steve on  Wed Nov 22 12:01 CST 2000 [RELATED]

      problem has been about the last 5k..was driven (starting at 40k)from nova scotia to florida..there a new ignition switch was installed..car ran fine until arrival in california and has continued..giving full throttle gets the car thru the flat spot and then it smooths out..as mentioned before..2 computers have resulted in flat spots but at different speeds..one at high speed and one at low speed...tps replaced..grounds checked..steve.






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