Jump starting an automatic???
18-12-2009, 05:20 PM
#1
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Jump starting an automatic???
Hi guys,
The battery on my Lexus is200 has gone flat, havent driven it for a week, and what with this snow and cold weather think its taken its toll,
now with it being an automatic, can i just jump it as normal from my work van or not??
Please help.
CheeRS
Baz.
The battery on my Lexus is200 has gone flat, havent driven it for a week, and what with this snow and cold weather think its taken its toll,
now with it being an automatic, can i just jump it as normal from my work van or not??
Please help.
CheeRS
Baz.
18-12-2009, 07:23 PM
#7
PassionFord Post Whore!!
There's no reason not to jump-start an automatic, but check the handbook for any special instructions - I have a customer saying he fried his ECU by doing this, though I'm not sure how you could do it wrong unless you connect to the wrong terminals.
Last edited by Iain Mac; 18-12-2009 at 07:25 PM.
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18-12-2009, 08:41 PM
#8
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What you should do and what most manuals state is that you switch on something that needs a lot of electricity (like the blower) on the car with the empty battery AFTER you've started it up and BEFORE you disconnect the jump leads.
Otherwise the voltage peaks that can occur when disconnecting the leads can kill electronic devices. I've seen it myself. Been in a car that had just been jump started. When the guy outside disconnected the leads all the interieur lights flashed up as if the car was running 20V for a second.
Otherwise the voltage peaks that can occur when disconnecting the leads can kill electronic devices. I've seen it myself. Been in a car that had just been jump started. When the guy outside disconnected the leads all the interieur lights flashed up as if the car was running 20V for a second.
18-12-2009, 10:20 PM
#12
basicly for a auto gearbox to work it requires centralfugal(sp) force (which is supplied from the engines flywheel),for the torque convertor(bolted to the flywheel)to produce enough fliud pressure to make the auto gearbox work!
without the engine running this can not happen!hence the gearbox is in effect n neutral and no turning force will be passed from the turning wheels(in the case of bump starting)to the engine!i would never recommend even attempting to bump start a auto unless you want to run the risk off fecking the gearbox up,i am still not even sure it can be done?
18-12-2009, 10:34 PM
#14
When jump starting something like a Lexus or other cars that may have a fair few gizmos in them, I would leave the jump leads on for a few minutes before trying to start it. This gives the control units a chance to 'wake up' so to speak and prevent spikes.
Also another thing worth noting is that a Lexus or Toyota do not always start straightaway after a flat battery or battery change. The immobiliser needs to reset itself. Leave the ignition on with the jump leads or pack connected for 10 minutes, switch ignition off and then try it. Should be jobs a goodun!!
Also another thing worth noting is that a Lexus or Toyota do not always start straightaway after a flat battery or battery change. The immobiliser needs to reset itself. Leave the ignition on with the jump leads or pack connected for 10 minutes, switch ignition off and then try it. Should be jobs a goodun!!
19-12-2009, 12:02 PM
#16
19-12-2009, 03:48 PM
#20
19-12-2009, 03:52 PM
#21
most dervs dont even need glow plugs anymore bud!granted on a mega cold day on the older dervs you will get the burn feeling through your legs!where you have to keep going lol!!but 7/10 times you should be able to get a old derv going 10/10 newer dervs
24-12-2009, 04:24 PM
#25
PassionFord Post Whore!!
you can bump old auto's, you have to tow them and crack up a good speed before it will turn the torque converter and start pumping oil round the gear box.
One note I always thought you needed a couple of volts in a bettery to start a petrol engine, IE the alternator need a little bit of power, but once when the battery on my xr4x4 would not even light up the ign lights on the dash, we towed it and I was told to keep it and in 3rd gear, with in 300 meters the fucker started, which I don't get?
One note I always thought you needed a couple of volts in a bettery to start a petrol engine, IE the alternator need a little bit of power, but once when the battery on my xr4x4 would not even light up the ign lights on the dash, we towed it and I was told to keep it and in 3rd gear, with in 300 meters the fucker started, which I don't get?
24-12-2009, 05:49 PM
#26
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you can bump old auto's, you have to tow them and crack up a good speed before it will turn the torque converter and start pumping oil round the gear box.
One note I always thought you needed a couple of volts in a bettery to start a petrol engine, IE the alternator need a little bit of power, but once when the battery on my xr4x4 would not even light up the ign lights on the dash, we towed it and I was told to keep it and in 3rd gear, with in 300 meters the fucker started, which I don't get?
One note I always thought you needed a couple of volts in a bettery to start a petrol engine, IE the alternator need a little bit of power, but once when the battery on my xr4x4 would not even light up the ign lights on the dash, we towed it and I was told to keep it and in 3rd gear, with in 300 meters the fucker started, which I don't get?
You can't pump them if that battery is 100% flat as the engine won't get any fuel. I.e. pump wont work.
When you got towed in 3rd the alt will have supplied power to the pump then it would have started.
25-12-2009, 10:30 AM
#27
PassionFord Post Whore!!
yes, but you need the alternator to produce power to run the pump.
but alternators need a little bit of power to produce power as it's coil to coil, not coil to magnet like a generator?
25-12-2009, 12:30 PM
#29
bump starting is when you get the wheels to turn the engine over
jump starting is when you have a flat battery and use another battery connected to it to crank the engine over
bump starting auto's means that you have to get the wheels turning the gearbox, which spins the torque converter blades which in turn turn the torque converted, which is attached to the engine, to turn the engine over
but this alsoturns the lubrication pump to pump fluid around the box so if it's not then you don't build up enough pressure and it may not change gears etc in the first palce
bumping a car with a cat causes unburnt fuel to get through the system which can set fire to the cat's internals and so it fucks it up
ump starting a lot fo new cars means finding out exactly how to jump them, some need certain electrics switching off otherwise they burn out, i recall a number of peole saying that you can blow up bmw ecu's with a jump start if they aren't "switched off" or something
best thing to do is to find out first before ataaching a secondary source of elecicity
or simply don't let the other car run so you don't see a spike in the voltage?
jump starting is when you have a flat battery and use another battery connected to it to crank the engine over
bump starting auto's means that you have to get the wheels turning the gearbox, which spins the torque converter blades which in turn turn the torque converted, which is attached to the engine, to turn the engine over
but this alsoturns the lubrication pump to pump fluid around the box so if it's not then you don't build up enough pressure and it may not change gears etc in the first palce
bumping a car with a cat causes unburnt fuel to get through the system which can set fire to the cat's internals and so it fucks it up
ump starting a lot fo new cars means finding out exactly how to jump them, some need certain electrics switching off otherwise they burn out, i recall a number of peole saying that you can blow up bmw ecu's with a jump start if they aren't "switched off" or something
best thing to do is to find out first before ataaching a secondary source of elecicity
or simply don't let the other car run so you don't see a spike in the voltage?
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