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1994 Mercury Topaz idles too fast in park or neutral

Tiny
RLPCHILE
  • MEMBER
  • 1994 MERCURY TOPAZ
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 115,500 MILES
Hello,
My 1994 Mercury Topax 4 cylinder idles at about 1000 rpms when stopped and in gear; however, when I put the car in park or neutral, the idle becomes unstable between 2000 and 3000 rpms. A mechanic tried using throttle body cleaner and lubricant, but it didn't really help much. I hope you have an idea of what to do. It is a good car and runs very well.
Thank you!
Richard
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Sunday, August 3rd, 2008 AT 4:35 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Inspect all the vacuum lines, injector seals, power brake line and intake manifold gaskets for leaks, cracks etc.
A high idle is generally a vacuum leak. I would clean the idle air control port in the throttle body, but generally you will be looking for a cracked/ripped vacuum line.
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Tuesday, August 5th, 2008 AT 5:09 AM

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