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Posted on Jan 02, 2017
the throttle body is probably gummed up. You need to buy some throttle body intake cleaner and clean the throttle body. After you've cleaned it up, recconnect the battery and it should reprogram the engine's idle and your problem should be solved. It's pretty easy.
Posted on Feb 10, 2009
I could very well be the TPS throttle position sensor acting up. I had a very similar situation on a 99 Concorde with the same engine in it in my shop today. Go to a shop that is able to do a data stream on the engine. What it is, is they hook up a scanner and have the ability to watch all the sensors as the car starts/runs.
Posted on Feb 12, 2009
this may be the cause, try it and see if it helps, it is a very common cause of problems like yours.
Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
Posted on Mar 03, 2009
Its not unusual for the crankshaft sensor to intermittanly fail. The crank sensors are not real expensive and are not extremely hard to change.
The Crankshaft Position Sensor (CKP) is mounted into the engine block above the starter motor. Engine speed and crankshaft position are provided through the crankshaft position sensor. The sensor generates pulses that are the input sent to the powertrain control module (PCM). The PCM interprets the sensor input to determine the crankshaft position. The PCM then uses this position, along with other inputs, to determine injector sequence and ignition timing. The sensor is a Hall effect device combined with an internal magnet. It is also sensitive to steel within a certain distance from it.
Below is a pic of the sensor location.
Posted on Jul 23, 2009
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