Question about 1995 Jeep Cherokee

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When ac or heat on, runs and idles rough - 1995 Jeep Cherokee

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Double posted, but now we know its a 95 chickodee.
do a tune up,. ever? ever do the critical 60k mile tune up?
60,120,180k etc>?
engine misifre, is that what you have? (rough engine?)
are you parked or moving.????????

Posted on Dec 30, 2013

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Posted on Jan 02, 2017

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1 Answer

2004 Kia Optima idles rough when AC on; idles fine when AC off -- what is the problem?


Putting on the AC causes power to be taken from the engine, and that is quite usual (unless it's taking excessive power but if there are no noises and it's working ok that's unlikely).
That will slow down the engine (similar to switching on your heated rear window whilst idling)
What you are seeing is the idle is probably a bit slow, and it's too slow with AC on. Have a diagnostic run to check idle speed and mixture at low revs.

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Car runs rough when ac is cut on. seem like it puts a load on engine.


I believe your A/C idle up valve may have failed. They do this when hot, but test OK when cold. See here p228

http://www.turboninjas.com/camry/eg1.pdf

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Engine stalls when making full stop when AC is on, but when I cut it off it's just fine.


Check when idling and warmed up if the rev drops when the AC is on. It may be too low or is running rough. You may have to adjust the idle screw with little adjustments. If the idle is running rough, inspect the idle air control valve. It may be dirty or faulty.

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Engine speed decrease when stert the AC


IDLE AIR CONTROL VALVE IDLE SPEED TOO LOW. IDLE SPEED SHOULD BE 750 - 850 RPM. IDLE SPEED NEED TO BE CORRECT OR IT WILL CAUSE ENGINE RUN ROUGH OR STALL OUT.AC COMPRESSOR WILL TAKE SOME POWER FROM ENGINE WHEN AC IS OPERATING.

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Rough Idle when cold runs seems to run ok hot but still almost stalls when you turn on AC and you are at a stop also noticed that the volt meter reads 9v with the AC and the lights on with the AC and...


mcdevito75 here, Sounds like a faulty voltage regulator, it"s 1 unit with the alternator, change the alternator, also the alt. supplies juice to the ignition switch, distributor abd plugs, thus a rough idle due to bad alternator.

Jun 19, 2010 | 1994 GMC Suburban

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My nissan frontier runs fine until I turn on the air conditioner, then it begins to run rough.


if it runs rough only at idle with the AC on then it osunds like a the idle solenoid that causes the vehicle to idle up when the ac is on. if its during the entire RPM range then you might want to check your alternator or battery, perhaps one of them isn't supplying enough power to run the engine, lights and A/C

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AC blows hot air


try this website fix & troubleshoot heating & A/C www.automedia.com and another car A/C repair www.directgardening.com

May 25, 2009 | 2002 GMC Envoy XL

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Rough idle - white smelly exhaust


the roughness at idle is the shocks .replace the shocks. i had the same problem

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1 Answer

Rough idle when a/c on


it is normal for your car to idle down when the ac pump cuts in just have your timing checked and adjust your idle as necessary at about 750 rps at normal idle with ac off also just make sure they havent overtightened the ac belt and pulley.

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