Question about 2004 Jeep Grand Cherokee

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Getting code po505

Change idle sensor 2 times on thottle body engine light keeps comeing on code po505 and car idles at 700 when cold then car warms up and idles around 1100rpm

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 1997 jeep grand cherokee runs rich after long trips

Could have a bad map sensor. The Map sensor is located on the throttle body. I have seen countless Jepp that start blowing black smoke when they go bad. That would be a good starting place.

Posted on Sep 13, 2008

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SOURCE: 2004 Jeep Grand Cherokee. Keeps stalling, engine

P0505 means the whole Idle Control system, not only the IAM. Check all related sensors (i.e. crankshaft sensor). Check with a voltmeter direct at the connector of the IAM if you get any signal. Remove the IAM from the TB, connect him, let someone switch your ignition key to ON. The IAM need to drive in/out for a short time to find the right position. Hold the IAM near a hard part, that they cant drive out completely! If IAM works fine, check the fuel pressure, check and clean your TB ( if not done yet). If that doesn't work, come back again please

Posted on Oct 27, 2009

  • 1757 Answers

SOURCE: Idle problems 1995 Jeep Grand Cherokee Limited V8

There are several possibilites.
When it dies does the Engine Light come-on and stay-on? If so there are codes which are present that can isolate/point you to a more specific problem.
Based soley on your description: I would first check your Spark Plugs, Wires, and Coil. When were they last replaced? If these are fine: When was the Fuel Filter replaced? Air Filter? Check the fuel pressure at the port located on the fuel rail in the engine compartment.
If those check out okay: I would check and/or replace the Idle Sensor and/or the Throttle Position Sensor.
Basic rules on bad idling:
1. Fuel - is there enough getting to the cylinders?
2. Spark - Is there consistent spark getting to all the cyclinders?
3. Air - Is there a air shortage = clogged air filter?
Let me know if this helped, or if you have additinal information or questions. Feel free to contact me a FixYa.com!

Posted on Jan 06, 2010

  • 617 Answers

SOURCE: jeep fast idle

check for broken pcv valve

Posted on Feb 05, 2010

ZX2Fast
  • 547 Answers

SOURCE: 2002 Jeep cherokee check engine light on. code p0122

Throttle/Pedal Position Sensor A Circuit Low Input

This usually means the sensor is unplugged or you have an open circuit. Check the wires to make sure there are no breaks in them.

Posted on Mar 04, 2010

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Warmed up fast idle, about 2,000 RPm. If shut off and restatred it will idle untill gas pedle is pressed... simular to a stuck thottle cable but that is not the problem. TPs works smooth (ohm meter) get...


2000 rpms is to high for cold start at idle way to high.
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This is the one behind the cataylic converter that is reading the final results and sending this to the computer to control the engine speeds and funtions at all speeds you should look into this .

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3 Answers

Check engine light fault code PO505


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1997 chevy cav. 2.4l acting up in the idle position.


SOUNDS LIKE THE IDLE SENSOR IS FAILING. IT NEEDS TO BE REPLACED. CAN BE FOUND AT MOST AUTO PARTS STORES. THIS DEVICE IS LOCATED ON THE THROTTLE BODY. AN ILLUSTRATION CAN BE FOUND AT THE PARTS PLACE TO BE SURE THAT WHAT YOU ARE REPLACING IS CORRECT. HOPE THIS HELPS. KEEP ME POSTED PLEASE. THANKS FOR AN HONEST RATING AND FOR USING FIX-YA.

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