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2003 Cadillac Escalade

My vehicle runs Ok when idled, when I turn on the A/C or defrost the car idle starts to drag and try to cut off. When I turn the A/C or defrost off it idles back to normal.

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It sounds like it is misfiring or idle control valve is bad or somewhere in the intake is catching air but if you don't have check engine light on your cluster than it is a 90% chance it is the idle control valve.

Posted on Apr 23, 2014

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: car idles ok but cuts out when you try to drive it off

The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

Posted on Nov 05, 2012

emissionwiz
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SOURCE: car idles ok but when you depress accelorator it splutters and cuts out when you try to drive it

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Posted on Nov 05, 2012

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1 Answer

Engine cuts off when i turn on a/c or defrost at idle


Ac puts extra drag on the engine. Defroster also turns on the AC to remove moisture from windows. Sounds like your idle speed is too low. On some cars the computer compensates for the added drag by increasing engine idle. I would start with a tune up. If the check engine light is on you can get the codes read for free at a large chain auto parts store. This will tell you if components are bad

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