2000 Dodge Durango High idle in park

2000 DODGE DURANGO
93,000 MILES • V8 • 2WD • AUTOMATIC
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NIFTYGUY239
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Hello,

I recently had some surging issues and having really rough starts in cold weather. I replaced the TPS and the IAC (cause of the rough start in cold weather). I found that information while searching. What I could not find is what causes the vehicle to high idle (1200 rpms) when the vehicle is placed in park?? I have no clue about this.
Dec 25, 2008 at 3:29 PM
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RASMATAZ
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Too fast an idle speed. If an engine without computerized idle speed control is idling too fast and refuses to come down to a normal idle speed despite your best efforts to back off the carburetor idle speed screw or air bypass adjustment screw (fuel injection), air is getting past the throttle somewhere. Common leak paths include the carburetor and throttle body gaskets, carburetor insulator spacers, intake manifold gaskets, and of course, any of the engine's vacuum fittings, hoses and accessories. It is even possible that leaky O-rings around the fuel injectors are allowing air to leak past the seals. Another overlooked item can be a worn throttle shaft.
Dec 25, 2008 at 3:43 PM