1996 Dodge Intrepid Fast Idle

Tiny
GEORGE SHORES
  • MEMBER
  • 1996 DODGE INTREPID
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 166,000 MILES
My car just started Idling at 2000 rpm one day and won't Idle down now, when you put it in gear it idles at 1000 rpm. I do have a code reader.
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Tuesday, June 2nd, 2009 AT 7:27 PM

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Tiny
RASMATAZ
  • MEMBER
Scan the computer for code/s and get back with any also check below

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 and a defective idle speed speed control motor/valve stuck in the extended (high idle speed) position/throttle position sensor. Also the throttle plate could be binding in its bore and kinked accelerator cable, coolant temperature sensor might not be operating properly misleading the computer that the engine is still cold and computer throwing fuel at it raising the idle speed.
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Tuesday, June 2nd, 2009 AT 7:56 PM
Tiny
GEORGE SHORES
  • MEMBER
Hi, I got a PO 108 code, Manifold Absolute Pressure/Barometric Pressure Circuit High Input.
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Tuesday, June 2nd, 2009 AT 8:16 PM
Tiny
RASMATAZ
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http://www.2carpros.com/forum/automotive_pictures/12900_map_11.jpg



It could just be a bad signal from the MAP sensor or a poor connection at the sensor. Or a bad MAP sensor itself. Maybe the vacuum line is off or broken.

Manifold Absolute Pressure (MAP) sensor measures the changes in the intake manifold pressure which result from engine load and speed changes, and converts this measurement into a voltage output.

A closed throttle on when the engine is decelerating would produce a relatively low MAP output, while a wide open throttle would produce a high output. Manifold absolute pressure is the opposite of what you would measure on a vacuum gage. When manifold pressure is high, vacuum is low. The MAP sensor is also used to measure barometric pressure under certain conditions, which allows the PCM to automatically adjust for different altitudes.

The PCM sends a 5 volt reference signal to the MAP sensor. As the manifold pressure changes, the electrical resistance of the sensor also changes. By monitoring the sensor output voltage, the PCM can determine the manifold pressure. A higher pressure, low vacuum (high voltage) requires more fuel, while a lower pressure, higher vacuum (low voltage) requires less fuel.

A high or low voltage fault in the MAP sensor circuit should set a DTC P0107 or DTC P0108. If the MAP sensor sends an intermittent zero voltage signal to the PCM, a DTC P0106 will set.
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Tuesday, June 2nd, 2009 AT 10:34 PM

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