Sudden RIM surging

Discussion in 'The Garage' started by akaNYr, Apr 6, 2019.

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  1. akaNYr

    akaNYr New Member

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    I have a 95 Mustang GT 5.O SN95 that has been random surging RPM's for months. It happens about 20 minutes after I start driving on the highway or streets. The car don't move any faster but will jerk if I'm on the highway & the RPM surges. It surges anywhere from 1000 to 2000 above normal. I changed cracked vacuum lines, cleaned the MAS & throttle body 5 times, lubed the springs & cables on the throttle body & cleaned and tested the iac, none fixed it. I tested the TPS, it wouldn't go below 1.09 volts throttle closed and 4.85 wot. I bought a new TPS & it reads 1.38 volts throttle closed. Car has more power & responded better but RPM's surged but not as high or as much. The TPS is non adjustable, any help would be much appreciated.
     
  2. evilcw311

    evilcw311 Most Evil Member! SN95 Supporter

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    Possibly a bad iac


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  3. 07GtS197

    07GtS197 Well-Known Member

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    Do you have an auto trans?


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  4. evilcw311

    evilcw311 Most Evil Member! SN95 Supporter

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    Never mind just noticed you said it does it while driving on the highway. Iac wouldn’t do anything at highway speeds.


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