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What would be the problem when the RPM is idle?

The RPM sensor went idle after repairing the alternator and battery. The speedometer works properly. Thanks

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  • 78 Answers

Might be something hasn't been put back on properly. When you work on a car, you can sometimes knock something in the area you were working on. Even professionals do it from time to time.

Posted on Nov 09, 2014

  • Amin
    Amin Nov 09, 2014

    Thanks Dave!

  • Amin
    Amin Nov 09, 2014

    Actually, my mechanic told me to take the car to one of Nissan garages to reprogram the computer, because the RPM sensor does not get action and must be reprogrammed. I don't know how much it makes sense.

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6ya6ya
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Posted on Jan 02, 2017

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3dmaster
  • 183 Answers

SOURCE: Idle problem

Yes you can,

do this with your RPM setting,

you ahve to just set you engine race settings,

try & having funn with your car,

THNX

Posted on May 18, 2008

  • 7 Answers

SOURCE: 1992 Olds Cutlass Ciera S Speedometer Problem

get new speedo cable or check both sides and see if the wheel is broken on either side

Posted on Mar 19, 2009

yotaguy
  • 232 Answers

SOURCE: low battery gauge indicated

Not necessarily,this can also be caused by poor battery cable connections or a bad battery cable or a bad connection to the gauge or just a bad gauge.Check or have them checked first,and then have the alternator output tested,a voltmeter connected at the battery posts should measure 14.5 to 14.8 volts at an idle,any lower than this than the alternator is the problem.

Posted on May 30, 2009

  • 1 Answer

SOURCE: speedometer, gas gauge, odometer, rpm gauge not working

My gas guage, speed odometer and tempiture does not work
The speed odometre is reading 9999999 what should i do

Posted on Oct 21, 2009

goody2shoe
  • 109 Answers

SOURCE: 2000 Grand Cherokee Jeep RPM and Speedometer not working

Before buying a new battery ...have your electrical system checked ...usually about 35 to fifty bucks or so ...worthy it ....instead of buying some thing you don't need ....like a battery ,alternator ...good luck
If you still are having problems let me know ...Joe

Posted on Jan 08, 2010

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2 Answers

Idle is rough, smoothes out around 2000 RPM, still there not as bad. Idle is below 800 RPM, not charging battery enough, checked moter mounts, mounts ok.


800 RPM is not bad and is enough to run the alternator. What you need to check is the idle air speed motor.

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If the filter box was removed during repairs make sure all ducts are put back together properly and all sensors in ducts are also plugged into each connector.

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Alternator went out a and battery died P0420 code


the history i dont need, at all.
as is true on all old cars, batteries and alts and starters a many.
so p420 has nothing to do with this , (means lazy cat, ignore it)
420 is a private hell. do not look, there, unless forced by GOV dark forces. (ask if serious, done many)

so now we have 500rpm this is clearly wrong, HOT? engine???????
this means idle controls are hosed. (bad)
bad idle means the PCM tried, to raise RPM to 800 (common)
and fail.
for 2 reasons. (and 50 causes)
1: ISC is stuck or bad.
2: engine lacks power. (too lean or misfiring are IT)
do you want to guess or test.?????????????
i can do #2 only. test.
ask.

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Hi there By what you are saying id say that you alternator is no longer charging thus there is insufficient power to run all the vehicle systems .
get a multi meter and test your volts if below 10/11 volts new altenatror is needed or to be repaired

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I recently purchased a 2002 mitisbushi lancer and the idle was going up and down. When i turned air conditioner on the idle went down, when i turned it off the idle went up. Now with that being said i put...


Disconnecting the battery will not delete stored fault history. It must be done with a CRT (Snap- On 3000) or equivalent. The idle condition you have now should be the opposite. 1200 RPM with air on 900 with air off. This vehicle is at an age where several components are probably out of range. I would try changing the cheapest parts first. 1 Fuel filter 2 Air filter 3 Thermostat For Coolant) 4 All coolant temp sensors (They can affect idle) 5 MAP sensor(manifold absolute pressure sensor) 6 Idle air motor. Sometimes the idle air motor can be cleaned . Check pintle and seat for carbon build up, clean with a valve guide brush. Pintle not seating will cause idle problems

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2000 Grand Cherokee Jeep RPM and Speedometer not working


Before buying a new battery ...have your electrical system checked ...usually about 35 to fifty bucks or so ...worthy it ....instead of buying some thing you don't need ....like a battery ,alternator ...good luck
If you still are having problems let me know ...Joe

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1992 Olds Cutlass Ciera S Speedometer Problem


get new speedo cable or check both sides and see if the wheel is broken on either side

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