Jump starting - donor car running

[anxious_ant]

I’ve been a numpty and due to the stress of the situation, I’ve connected and disconnected the jump start leads whilst the donor car is running.

I haven’t started the donor car yet (2017 S90) but did notice that the throttle response is slightly sluggish. Not too sure if it’s just a gut feeling though.

Is is a bad idea doing this?

[Scrump]

I always do this. Never had any problems.

If you haven’t started the car how do you know the throttle response has changed?

(Appropriate user name )

[Amused2death]

I've done this several times in my life, both with donor vehicle running and not running. I've never experienced any issues either way.

[steveo3002]

more likely to have reset the ecu adaptions from having a dead battery causing the slow response ...needs to learn again

[anxious_ant]

Scrump said:

I always do this. Never had any problems.

If you haven’t started the car how do you know the throttle response has changed?

(Appropriate user name )

Lol appropriate username indeed.

On my way back the throttle seems a little bit sluggish.
This is on the donor car.

I haven’t started the donor car yet after arriving back home.
However I will keep an eye on my next trip. I will probably top battery up with a trickle charger. I have a CTEK but considering buying something better as for the Q7.

Edited by anxious_ant on Monday 26th July 11:18

[anonymous-user]

Got a mat stuck under the throttle pedal? Jumping another car from an already-running car should have zero side effects on the donor car.

[anxious_ant]

steveo3002 said:

more likely to have reset the ecu adaptions from having a dead battery causing the slow response ...needs to learn again

Sorry, I should’ve been clearer. This is on my donor car

I didn’t turn the engine off, and connected leads whilst donor was running.

Perhaps it’s just placebo of me worrying.
Most instructions for jump starting states donor car needs to be turned off when connecting and disconnecting jump leads.

However from replies it seems that I should be fine
Sorry all, it’s been a very hectic Monday morning!

[steveo3002]

its probbaly in your head ...jump starting mistakes usually result in blown fuses or elec parts and would stop the car running

[anxious_ant]

OpulentBob said:

Got a mat stuck under the throttle pedal? Jumping another car from an already-running car should have zero side effects on the donor car.

Cheers for this. Just wanted to confirm as when Googling it would seem I need to ensure donor car is not running.

You can probably tell I don’t do this often ..

[Penelope Stopit]

It'll be ok

There's no such thing as worry

You are concerned

[anonymous-user]

Penelope Stopit said:

It'll be ok

There's no such thing as worry

You are concerned

Penelope, stop it.

[anxious_ant]

steveo3002 said:

its probbaly in your head ...jump starting mistakes usually result in blown fuses or elec parts and would stop the car running

Thanks. You are right, if I’ve tried something I wouldn’t have been able to drive the car home.

[Penelope Stopit]

OpulentBob said:

Penelope Stopit said:

It'll be ok

There's no such thing as worry

You are concerned

Penelope, stop it.

Ok then, am worried now

[sunbeam alpine]

OpulentBob said:

Jumping another car from an already-running car should have zero side effects on the donor car.

I'd always thought this until a couple of years back. A good friend of mine has a Fiat/Alfa garage, and he's located quite close to a hire car company who also have a lot of Fiats. There was a period where he was replacing the complete dashboard of Fiat 500's after they'd been used to jump start one with a flat battery. It was always the "donor" car that suffered, never the car that needed the start.

[Deranged Rover]

sunbeam alpine said:

I'd always thought this until a couple of years back. A good friend of mine has a Fiat/Alfa garage, and he's located quite close to a hire car company who also have a lot of Fiats. There was a period where he was replacing the complete dashboard of Fiat 500's after they'd been used to jump start one with a flat battery. It was always the "donor" car that suffered, never the car that needed the start.

Italian car with flaky electrics? Who'd have thunk it?

[Chris32345]

sunbeam alpine said:

I'd always thought this until a couple of years back. A good friend of mine has a Fiat/Alfa garage, and he's located quite close to a hire car company who also have a lot of Fiats. There was a period where he was replacing the complete dashboard of Fiat 500's after they'd been used to jump start one with a flat battery. It was always the "donor" car that suffered, never the car that needed the start.

The cluster on them is a known weak point likely the voltage sure finishes them off





But when jumping anything start with both cars turned of connect cables up and earth on the body of the car being jump and not direct to the battery if possible