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1998 Volvo S90 revving issue

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anash715
New User

Aug 5, 2012, 7:22 PM

Post #1 of 4 (2326 views)
1998 Volvo S90 revving issue Sign In
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


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Aug 5, 2012, 7:30 PM

Post #2 of 4 (2315 views)
Re: 1998 Volvo S90 revving issue Sign In
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 when a problem is resolved.


anash715
New User

Aug 5, 2012, 7:33 PM

Post #3 of 4 (2308 views)
Re: 1998 Volvo S90 revving issue Sign In
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


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 6, 2012, 3:20 AM

Post #4 of 4 (2263 views)
Re: 1998 Volvo S90 revving issue Sign In
Quote
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
So when you arrive at the mechanics he has to send you away because you already erased all the valuable diagnostic info from the computer. You need to decide who is fixing this car, you or them and them stick with it because you don't want to mess with it yourself and then ask a mechanic to look at it. He won't be real happy about that or able to help much.



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