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hi, what could be the reason for the revs to drop from about 950rpm to 500rpm when i put the lights or the heater blower on full, faulty alternator or battery or both?
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It happens. On some cars its perfectly normal.
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TourVanMan TM < Ex RF >
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well its never has happened on any car ive ever had..
so i would so no its not normal
if i put on the air/con lights stereo heating etc the revs drop "slightly" then the system picks up again and returns to "normal"
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sometimes a little bit too much opinion....but its only because i care !!!
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It would help if we had some details of the car, this is normal for a Hispano Suiza.
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It happened on nearly every car I had that didnt have electronic engine management. Ie a carb, spark plugs and mechanical distributer.
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TourVanMan TM < Ex RF >
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Hello
Is this the 1.1 Fiesta or the 1.0 Fiesta if so they both have electronic Distributerless ignition systems.
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(iam not a mechanic)
Martin Winters
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I don't think the type of ignition system makes much difference.
My Grandads old 1.3 Escort gives a rev drop, but not as much as yours. Idle speed is about 1000rpm & it drops to 750 if something significant is switched on.
It depends on what sort of idle speed control system it has. I think some sophisticated carbs have an idle control system but not all.
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its a 1.1 fiesta {Added to subject header - DD} with (dis) distributorless ig syst
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Some of these were fitted with a device called a "throttle kicker" to return the idle speed to normal to compensate for the increased load.Basically a solenoid that was energised when lights or HRW were on.
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Although a slight drop in idle speed may be normal for some cars (especially smaller engines IMO), I would say there is something wrong if it almost halves the idle speed. 950 rpm seems a little high and 500 rpm is quite low. Maybe there is an underlying fault and someone has increased the off load idle speed to compensate.
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