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Rpm is dropping while idleing - Cars & Trucks

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It is not unusual for RPM to vary during idle as much as 200.

Posted on May 01, 2015

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Posted on Jan 02, 2017

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When air conditioner clutch engages it pulls down all vehicle voltage and belt and clutch start to slip


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your enigine IDLE RPM is no longer in control.
the RPM dropped so low the Alternator can produce enough juice, current. diagnose, that first. at belt, is belt slipping>?
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Rpm drop below idle


What's happening is, the engine is under increase load when the A/C is running. Typically there is a solenoid (near the throttle linkage) that controls idle speed when the A/C compressor (clutch) is engaged. It activates each time the compressor cycles on to regulate the system. If idle returns to normal when A/C clutch is disengaged (or A/C is off), then the solenoid or some signal that controls the solenoid to maintain the idle is the likely to be the problem. e.g. The solenoid fuse maybe blown. This might be a good place to start investigating the problem. Best of luck resolving this problem.

Dec 10, 2013 | Cars & Trucks

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'99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------


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problem with 1993 Geo Prizm '99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------

Apr 15, 2013 | 1993 Geo Prizm

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2000 suburban 1500 right before air on and right before it turns off enigene drop to about 350 rpms


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Rpm does not drop below 1000


No,only on carburated engines it,idles down to the set point,on yours,it's fuel injected,pushing gas pedal won't kick idle down,should go down after a certain amount of time,does it automatically,If you start and drive a 5 mile ride and stop at a stop sign,it should idle at it's set point if there's no engine problems,which may be.5 to .7 on your tac.When you normally first start,it will idle between 1000 to 1200 rpm's,don't push on gas,let idle say 15 seconds,put in drive and go.

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Cold engine, idle rpm 1200 is this normal? 2002 Toyota Carollia


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RPM drops to zero at idling after engine accelerates when warm


This may been an ignition module or a MAF sensor, this car may need to be diagnosed using a OBD I computer code reader to accurately diagnose the problem.

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Idle adjustment 2002 chrysler sebring


Your idle is electronic you can't adjust this. Or at least you shouldn't. You have a sensor for speed and idle. In most cases depending on where you are the idle should drop to 700 rpm in most 2.4 if this helps you. When the car is cold it can range between 700 and 1000 rpm.

Jan 05, 2009 | 2002 Chrysler Sebring

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