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When Air cononditoner on rpm dropping - Cars & Trucks

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Ac compressor will drop the rpm by about 350 -450 rpm and this is compensated for by the CPU which increases the fuel setting to maintain constant rpm. Run fault codes if there is a problem

Posted on Dec 29, 2013


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Setting gas and air mix

Each barrel will have its own mixture screw.
with engine running, slowly back out. Rpm should drop. Slowly screw in. Rpm should increase, then drop. Back out to peak rpm then another 1/3 turn. Do screw for each barrel.

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Check all fluid levels, check your air filter to make sure it isn't dirty... if that doesn't help go to a mechanic... could be anything from air getting into the line to a fuel line going too close to the manifold and boiling the gas, to electrical

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2010 ford ranger is turbo charged but you cant feel the turbo working new filters turbo good boost good if you remove the air filter it goes a little beter but with th air filter it looses power as you go...

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Have a '99 silverado that will not idle

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Apr 15, 2013 | 1999 Chevrolet Silverado 1500

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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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Jan 31, 2013 | 2000 Chevrolet Suburban

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92 geo 1.6 l shoc sounds like a missing v-8 exhaust has a lot of raw gas smell to it and it runs extremely rough until warm, if trying to drive before it is warm, tach will drop to nearly 0, engine will...

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Jan 12, 2018 | 1992 Geo Storm

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2002 trailblazer. the air all of the sudden started blowing HOT air! also when air is turned on the rpms drop dramaticaly and have even stalled the engine a few times! what gives?

Do you have standard environmental controls or are they of the digital type for one? As far as the RPM's dropping hard, you can have a dry compresser. try a can of " R134 with oil " sounds to me that if all this just started happening with the HOT air and the engine rpm's dropping. you may heve a leak in the system, and if you continue to run it you can cause sever damage to the compresser.

Jul 17, 2009 | 2003 Chevrolet TrailBlazer

1 Answer

When i activate the air condition the engine meter, goes up and down.

The "Tachometer" is the gauge that indicates the engine RPM. It is not unusual for the idling RPM to drop slightly when the air conditioner comes on. The air conditioner represents a fairly large load on the engine so when it starts, the RPM will drop slightly. When driving, you'll probably not even notice that the air conditioning is a load on the engine unless you're accelerating uphill, pulling a trailer or passing another vehicle while the vehicle is fully loaded. At idle, the Envoy's computer should detect the falling RPM and make adjustments in fuel delivery to bring the RPM back up.

In any case, it shouldn't be cause for alarm, unless the air conditioner is stalling the engine. If this is the case, you are probably in need of service. The issue of low cooling from the air conditioner while idling in gear (as is the case when stopped in traffic, etc.) is correctable free of charge at the dealership on certain vehicles as a result of a recall. Your dealer can tell you if your vehicle is affected or if there is other recall work pending on your vehicle based on the VIN.

I hope this helps!

Aug 12, 2008 | GMC Envoy Cars & Trucks

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