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Engine rev when put in park

 
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Old 25 Jul 2013, 07:52 pm
Young Cruiser
 
Join Date: Aug 2012
Location: Camp Hill, PA
Posts: 52
Default Engine rev when put in park

Hi everyone. For the past few months, my pt has been doing a rev when I shift from drive to park (it does it when the shifter enters the park position--shifting from drive to neutral causes no rev). It started as an infrequent event, but now happens about 90% of the time. When you shift into park, it revs up to about 1500 and then drops right back down to normal park idle. It's not really bugging me, I'm just curious as to what might be going on. This week I pulled the IAC valve and cleaned it, but that didn't really do too much.

As always, I appreciate everyone's willingness to help!
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Old 25 Jul 2013, 08:27 pm
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Join Date: Sep 2001
Posts: 27,744
Default Re: Engine rev when put in park

Might be a problem with the TPS (Throttle Position Sensor), also located on the throttle body.
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Old 25 Jul 2013, 09:19 pm
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Join Date: Aug 2012
Location: Camp Hill, PA
Posts: 52
Default Re: Engine rev when put in park

Thanks for the feedback! I should also mention that the idle sometimes fluctuates slowly (normal for the count of 2 or 3, slight decrease in rpm, back to normal for a count of 2 or 3,repeat) when I idle with the brakes applied in drive. This doesn't happen as much and tends to be when the a/c is on ...but the fluctuation doesn't coincide with the compressor coming on or off.

Also, my acceleration is smooth and I have never had any issues with hesitation or anything like that.

Oh, in case it is helpful, I have an '01 non-turbo w/ about 185K.

Thanks again!
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Old 26 Jul 2013, 06:27 am
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Join Date: Jan 2013
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Default Re: Engine rev when put in park

Jd; check for vacuum leaks too.
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Old 26 Jul 2013, 06:52 am
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Posts: 27,744
Default Re: Engine rev when put in park

^^^ Agree. A large vacuum leak, like a hose falling off, will cause the idle to radically go up and down. Had that myself with the hose from the brake booster. A small tear or lose fitting vacuum line (which is hard to find) could cause the up and down movement as you mentioned.
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