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  • SN95 4.6L Mustang Tech

RPMs jump when car in park (video inside)

  • Thread starter Thread starter NewMStang
  • Start date Start date Jul 19, 2009
N

NewMStang

New Member
Oct 5, 2004
48
0
0
Jul 19, 2009
#1
  • Jul 19, 2009
  • #1
Eversince i replaced my plenum, intake, and TPS (i've gone through a few) I've had an issue with my rpms jumping when i place my car in park (obviously i have an auto). When I place the car in drive the car idles at about 500-600, when i shift the car into park the rpms jumpt to about 1k and then go down to about 750, anyone have any idea what can be wrong here?

Here's a video of what im talking about (sorry about the bad quality)
YouTube - CIMG3135

And while i was out there i took a small clip of what my exhaust sounds like:
YouTube - Mustang GT - BBK Catted X-pipe and flowmaster catback
 

BurningRubber

10 Year Member
Dec 6, 2004
1,865
24
58
Jul 19, 2009
#2
  • Jul 19, 2009
  • #2
I don't see anything wrong, per say.

Is you A/C on in the video? Having the compressor running will cause the idle to jump around a little more than with it off, since there is more load on the engine. I have noticed this on mine every time I run the A/C and I am at idle (but I am a 5 speed).

Have you replaced, or tried cleaning the IAC (idle air control) valve? It's the silver canister looking part on the front side of the intake plenum. If you clean it, use electrical cleaner or electronic parts safe throttle body cleaner.
 

VEE EIGHT

Member
Apr 27, 2009
85
0
6
Texas
Jul 20, 2009
#3
  • Jul 20, 2009
  • #3
Looks normal to me. My RPMS hover just under 1K when in park too, then dip down to 750 when in D
 

Brute03

Member
Mar 20, 2006
232
0
16
Jul 20, 2009
#4
  • Jul 20, 2009
  • #4
i see the problem - it's an auto

seems normal to me, just about every auto car i've driven did that
 

scupking

Active Member
Sep 18, 2005
1,186
1
36
Enfield, CT
Jul 20, 2009
#5
  • Jul 20, 2009
  • #5
It's normal mine does it to. I also have an Xcal2 so I can change the idle to whatever I want. I actualy have mine set at 750 right now and 850 in drive.
 
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