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anash715
New User
Aug 5, 2012, 10:22 PM
Post #1 of 4
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1998 Volvo S90 revving issue
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So yesterday morning when I was leaving for work when I started my car it just started revving up to about 3500rpm it did it a few more times and then stopped and now it starts fine but when I tap the gas pedal in park it revs to about 4000rpms on its own and drops. Could to be my TPS or maybe the MAF
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Discretesignals
Veteran
/ Moderator
Aug 5, 2012, 10:30 PM
Post #2 of 4
(401 views)
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Re: 1998 Volvo S90 revving issue
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Not sure without testing.
The idle speed is determined by the engine computer based on readings it gets from the engine coolant temperature sensor, TPS, engine speed, pressure switch signals, etc. All those things would have to monitored along with the how the PCM is controlling the idle air control motor to give you an idea what is going on and where to look for the problem.
Since we volunteer our time and knowledge, we ask for you to please follow up on your threads when a problem is resolved.
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anash715
New User
Aug 5, 2012, 10:33 PM
Post #3 of 4
(394 views)
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Re: 1998 Volvo S90 revving issue
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I'm taking it to the mechanics in the morning but right now I unplugged the battery hoping that reseting the computer could fix the problem
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| 1998 Volvo S90 revving issue |
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