Question about 2000 Mitsubishi Montero Sport

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Idle to low after changing battery - 2000 Mitsubishi Montero Sport

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No worry. the computer/obd was re set.

Posted on Oct 04, 2009

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Depending on which engine you have, there should be an idle speed control motor or air valve that controls idle speed.
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Hello - my 2nd hand 2006 Toyota Corolla - the idling seems low - this just started (not sure what caused it but by coincidence had to change my car battery and once changed I then noticed this low idling...


I am not sure about the exact idle required,but yes 500 is low.You should check the throttle position sensor next.If it is bad,it does not know how mauch gas you are using,nor how much is required.This is definitely a symptom of that.It also uses the TPS as an input to the engine computer which is 'telling' it to shut off.

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After i changed my alternator, my check charging system light and battery light comes on, also, my idle is very low now. when I pull up to a stop, truck stalls, I checked my alternator output and its at...


Was the light on before you changed the alternator? Check a couple of things: Check the connections if one is loose you may be running mainly off the battery but still show it's charging. Have you checked the battery under a load? Try checking the battery voltage with the car off and turning on the headlights. What does it read? 12.2 sounds like you may have a dead cell or if you have a bad connection you may be draining it. Sometimes a battery may show correct voltage but when load is applied it drops like a rock. if this happens replace the battery. Did the idle change when you changed the alternator or has it always been low?

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2002 GMC envoy slt 4.2 v6 My question is.. I recently changed the water pump on my wife's envoy. After replacing it the car idles low and high, low and high constantly. No normal idle like before. I...


Sounds like you may have disconnected the battery. Does the rough idle only happen when the defroster or A/C is on? If so clean your throttle body with throttle body cleaner with the battery disconnected. When finished, drive it for 5 or so miles with the defroster / AC off to let the computer relearn the settings. This will solve your problem.

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Battery lights is on & don't idle correctly


These trucks have what is called a smart charge system. It normal for the alternator light to elluminate when the truck requires no charging or the idle is low. The most likely reason you have low idle is throtttle body coking which requires cleaning or a bad idle air control valve. Also clogged injectors will cause a low rough idle but if that was the case misfires would show up and can be seen while they happen using a diagnostic data scanner.
And the first thing we always look at is the air cleaner. If you have a K/N filter the oil can contaminate the MAF senor. If the sensor cannot see and feel the air then it won't be able to add fuel causing a low idle, The MAF can be sprayed with brake cleaner to clean it. Usually you will get a p0171 and or a p0174 if the maf was causing a lean condition.

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My trailblazer has a idling problem, the battery gage is dropping when sitting at lights etc.thought it was altenator but changed it out still having the problem when it is sitting still it is idling to...


Very low idle will cause a very low voltage output from alternator, so nothing unusual about that. At low idle the truck is basically drawing from the battery, not the alternator. As soon as you cure the idle problem, the alternator gauge reading will return to normal.

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1 Answer

Low idle. 78,000mi recent very low idle almost stalling. Hwy miles 2006 GT. plugs never changed. TPS not changed or cleaned nor throttle body. Did replace a battery early in the year.


Most often, dirty or faulty 02 sensors will throw off the idle. The 02 sensors and camshaft position sensor basically control all the idle. If TPS was dirty or bad, you would have some hesitation when giving some gas. Bad plug would cause lack of power or misfire.

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'04 Mazda3 had very low engine speed during idling


I have encountered this problem also, try changing your battery. My battery lasted almost 4 year till it was the cause the shot my alternator.

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