Question about 1994 Toyota Corolla

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Lose timing condition

When the aircon is on , timing is unstable, so while the engine is running it turns shaky ,or jerky but when the aircon is off, it goes back to normal , even if the RPM is appropriately set,

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There is a valve on the intake manifold that increases the RPMs when the AC is on. Check for a vacuum leak at the hose going from it to the manifold, or the valve may be bad.

Posted on Sep 30, 2008

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If your car is carburated engine, check the idle up control valve, once you turn on your AC, you will see this screw pushing the rod of your trottle you can easily adjust the screw by turning it counter clockwise to get the right RPM

Posted on Oct 13, 2008


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I have a 2004 lancer Es when I turn the aircon on after 15 minutes of driving I cant change the gears the aircon works fine but renders the gears useless and have to turn it off to continue to drive

There is no relationship between the air conditioning system and the gear box in the vehicle.

The engine operates the aircon compressor via the serpentine belt from the crankshaft pulley and if the aircon is operating normally the aircom compressor will not be faulty either.

If you are having problems with the gearbox it has nothing to do with the aircon system. The issue will be with the gearbox itself.

Dec 27, 2015 | 2004 Mitsubishi Lancer

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How to solve problem on 4G93 GDI,lose power went aircon is running,if u turn off the aircon while driving can feel the go fast than before,what could be the problem

I don't think you HAVE a problem. The AC system puts a significant extra load on the engine, and a slight loss of performance is normal.

Aug 14, 2014 | 1998 Mitsubishi Galant

1 Answer

Why is my 1998 vrg gdi lose power on aircon is running...if i go up the hill or take off can fill like is struggling to soon as i off the aircon the engine gain power again you can really fee

have an ac specialist check the gas pressures and the compressor as it is drawing too much power from the engine or too much power from the ignition circuit
I would suggest a compression test in the engine as well to get the engine condition. Most ac compressors take about 5hp to drive and if the engine is a bit sad then that is too much power overall.

Aug 13, 2014 | 1998 Mitsubishi Galant

1 Answer

Aiir condition starts and stops on a vortex v6 engine

Most aircon system in any car usually has a sensor relay that the compressor will not continuously run if the thermostat are worn out ,if the clutch pack magnet wiring are grounded or worn out,if freon are low ,to find out which one is the problem go check the single wire connected to the clutch magnet right in front of the compressor where pulley and belt are located ,if you don't have a tester to find our that power are present all the time while. Using the aircon,you can bypass and hook another wire on it and hook it in the positive side of the battery ,while running the engine and aircon visually check the clutch magnet of the compressor if it will pop up ,if yes you have a worn out compressor magnet.

Jul 03, 2014 | 1997 GMC Sonoma

1 Answer

I have 1996 Honda Accord. The vehicle overheats, especially when the Air Conditioning is turned on. There is no thermostat in the car and the cooling fan doesn't work. Does it just need a new cooling fan?

If you run the vehicle with an inoperable radiator cooling fan you will overheat and destroy the engine. You will just make the problem even worse by running the aircon. The car should not be driven with an inoperable cooling fan.

A thermostat should be re-installed in the engine's cooling system and a new cooling fan installed.

If you have been running the vehicle with this overheat condition for some time you may well have already damaged the engine, the first sign of which may well be a blown head gasket and a damaged engine head.

If you damage the engine from overheating, repair costs can easily exceed the market value of this 1996 model car.

Dec 18, 2010 | Honda Accord Cars & Trucks

1 Answer

Corolla repair manual

can y tell me what enigne size ?

Mar 23, 2009 | 1993 Toyota Corolla

1 Answer

1987 Toyota Celica overheats when air conditioning is turned on


The first thing to check is that the engine cooling fan comes on when you turn on the air conditioning, then you should check the condition of the radiator fins. If they are clogged with debris (dead insects, leaves, etc...) then you will need to get a pressure washer onto it through the front grill and try to blast it clear.

When you switch on the aircon, it puts extra stress on the engine, which causes the fuel economy and engine power to drop, and as a result the engine will naturally run hotter, so it needs a bit of help to cool down in the form of the engine cooling fan.



Jun 09, 2008 | 1987 Toyota Celica

2 Answers

RPM is not stable.

adjust the RPM of the engine when the aircon is off that match the RPM of the engine when the aircon is on but not too much.

Jun 09, 2008 | 1994 Honda Civic

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