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Excessive idle at idle speed - Caravan Dodge Cars & Trucks

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  • mikefredrich Nov 15, 2008

    I have 1998 Dodge Dakota 2 WD with a simular problem. Before replacing the Throttle position sensor the engine was idleing at 1500 rpm and now its running at 3000 rpm. Several solutions I've found but haven't tried is one replacing the oxegen sensor. Or two it has something to do with the vacuum system. I could most likely replace the oxegen sensor, however I'm unsure of were to begin with the vacuum system. If I were dealing with the vacuum system wouldnt there be something wrong with my heater vents.

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MALFUNCTION PARTS ON THE THROTTLE BODY, GET DIAGNOSTIC READING TO PIN POINT THE PROBLEM

Posted on Aug 05, 2008

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Possible excessively high idle speed due to a problem in the automatic idle speed control system. This can be an engine intake manifold vacuum leak or a sticking Idle air control valve or throttle valve.

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Hello Patricia Kennedy.

Besides a dirty air filter... listed below... idle air control valve... the idle speed is pretty tamper proof...

If the car has not been tuned up RECENTLY... that would be a STRONG recommendation before fine-tuning the idle speed.

The problem I am seeing ALL OVER the web... is the idle is too fast... (absolutely will cause STALLS).

All things being reasonable... your tachometer should show an RPM OF 650 to 1000 rpm... above that is quite EXCESSIVE...

A real TUNE-UP MANUAL would be required to properly set the SPEED ... but only after EVERYTHING had been serviced, cleaned and replaced...

Tuning up a car with DIRTY FILTERS & WORN spark plugs is an WASTE of MONEY!!

What I am seeing EVERYWHERE... is a HIGH IDLE problem... (above 2000 RPMs... That will ABSOLUTELY cause your car to stall at a STOP... because your TORQUE CONVERTER is designed to lock up (quit acting like a clutch)...

If your idle speed it above 1000 rpm... that WAS a BIG RECALL issue for GM engines...

Check out the links below... a high idle can stall an engine better than a low one...!!

Comment me back if I am not being particularly clear... or wwatch some of the videos I have attached.

Good luck.


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1 Answer

I change coil pack,transmission speed sensor but the engine still in rough idle


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Check accelerator cable, idle air control system and idle speed control motor(ISC), air intake setting and sensors, check the vacuum system. Scan the PCM for diagnostic trouble codes. ISC, vacuum leaks and air intake problems are the most common cause for fast idle on this car.

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It sounds like everything is working properly. The temperature will go up when idling. The wter isn't being pumped through the system as fast. When idling, the engine runs at around 750 rpm's. When driving, even at low speeds, the engine speed is at least double that. Make sure your antifreeze is set for at least 20° below zero.

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1 Answer

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The problem may also be the automatic choke. It could be stuck in fast idle. check all choke settings and linkages clean if nessesary. There is a separate fast idle adjustment screw on the choke linkage that controls engine speed while the engine is warming up. The tip of the screw rests against a cam that slowly rotates as the choke opens during engine warm up. Turn this screw counterclockwise to decrease the fast idle speed.

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1. Engine on-dissconect the power lead to the [idle speed control valve] located on top of the engine.
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You should now have normal tick over speed!

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