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Car revs drop when using electrical items - Corolla Toyota Cars & Trucks

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  • charliepulle Oct 21, 2008

    no not added anything, but i dtd think it was the alternator?



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To some degree this is normal, if it seems worse than before (I assume you have owned the car for awhile) then it is possible the battery is starting to go bad, if the battery is in a low state of charge then the Alternator has to work hark to keep the system voltage up, this takes engine power, up to 3 HP depending on the AMP rating of the ALternator, on bigger engines this will not even be noticed, on small engines like yours it will be noticed, one question, have you added anything that might be pulling allot of power? like a sound system amplifier? if so that is dragging the engine RPM down and you may need to upgrade the alternator to a higher amp rating unit.

Posted on Oct 21, 2008

  • yadayada
    yadayada Oct 21, 2008

    Kragen auto parts will test the charging system for free.



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How will I adjust the rev of carburetor when aircon is on?

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your problem I take it is that when the ac cuts in the idle rpms drops and makes the engine run rough
This is normal as the ac compressor takes up to 5 hp to drive it
what you need is an electric controlled vacuum pot connected to the accelerator lever so that when you switch on the ac the power to the ac clutch energizes the pot and vacuum pulls the accelerator lever to maintain the set idle rpms
such an item is found on most early carby operated engines

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Wen i turn on aircon revs drop and car shuts down 2003 2.2astra why

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My 1996 acura tl 2.5L dies out when anything electronic ( turn signal, heater, radio, etc. ) is activated but can be restarted soon after. all cluster/dash warning lights turn on before the car turns off....

it sounds as if the power supply to the ECU is being interrupted when aother electrical items are powered up. Check the main power supply lead to the ECU using a digital test meter. Check the voltage when everything electrical is turned off, with the engine at idle, Keep the meter leads attached to the power supply to the ECU, and have an assistant turn on some electrical items, carefully observe the meter, to see if the power voltage to the ECU drops off or is interrupted. If the power drops off, then you have a starting point.

If you are confident of your electrical skills, you could make a simple test device to by-pass the normal power feed to the ECU, then power up some items and if the engine does not die, again, you have a starting point for trouble shooting. Electrical troubleshooting is a task which requires lots of patience and a logical approach to the problem.

You might also wish to check the power supply to the fuel pump for the same reasons as the above. Again, be logical and systematic, do NOT be tempted to engage in shortcuts, they are seldom worth the trouble and effort expended, and generally, you will find yourself doing twice the work for a very small return!

Good luck.

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1 Answer

Electrical warning light comes on when I stop and the engine revs drop to nil then up and down, sometimes cuts out,if i rev the engine a c ouple of times the warning light goes off and the engine idles ok.

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Sounds like the fuel filter needs replaced. If that is not problem I would suspect the electrical grounds. Good luck and have a great day.

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1 Answer

Starts but won't stay running

I would sooner think it was caarbon on the throttle plates and a very dirty idle air control
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contact me if you have any questions
you should use about half the can of carb cleaner to do this.

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