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Old 10-04-2011   #1
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Start&Stop in stop-and-go traffic

Hi guys,

I have a 500 1.2 Lounge (bought new in July 2010) with Start&Stop (S/S). According to the Fiat 500 manual, the S/S isnít supposed to kick in unless the car has accelerated to ~6mph; cf. p.63:
Note The engine can only be stopped automatically after a speed of about 10 Km/h is reached, to prevent the engine from being repeatedly stopped when driving at walking pace.
However, mine cuts the engine every time I come to a halt, which is quite annoying in stop-and-go traffic when I definitely stay below 6mph. The dealer has installed the latest software and gave me a shrug.

Sure, I can turn S/S off manually, but Iím wondering how it behaves with other peoplesí cars in this case.

Cheers,

Lambert
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Old 10-04-2011   #2
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Re: Start&Stop in stop-and-go traffic

6mph is really slow, so its easy to exceed that even in a cars length of traffic.

Mine switches off every time too, unless I am in a slow moving queue when I disable S and S.

Cheers

D
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Old 10-04-2011   #3
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Re: Start&Stop in stop-and-go traffic

Thats normal, mine does it too. If i stop the engine cuts, then if i role to 6mph the engine starts up again.

If it gets annoying just turn the start-stop off while in traffic.
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Old 10-04-2011   #4
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Re: Start&Stop in stop-and-go traffic

I don't understand the 'problem'. SS works brilliantly, most of my stops are for less than a minute and it starts first time every time.

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D
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Old 11-04-2011   #5
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Re: Start&Stop in stop-and-go traffic

Quote Originally Posted by rallycinq View Post
I don't understand the 'problem'. SS works brilliantly ...
Well, I guess itís only a problem if you expect it to work as described in the manual. :-)
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Old 11-04-2011   #6
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Re: Start&Stop in stop-and-go traffic

Quote Originally Posted by Mondaugen View Post
Well, I guess itís only a problem if you expect it to work as described in the manual. :-)
bravo! now you're thinking like an Italian
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Old 12-04-2011   #7
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Re: Start&Stop in stop-and-go traffic

I normally choose when to use stop-start - if I'm in a traffic jam I keep my foot on the clutch, if I'm at the back of a queue at lights I'll put it in neutral and let the engine stop.

Never bothered with the disable button
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Old 13-04-2011   #8
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Re: Start&Stop in stop-and-go traffic

i am facing a serious problem with "start & stop" function while i m stopping at the hill then driving up a hill or slope. the car will roll back badly when the "star & stop" is running... it is scary and dangerous may i know anybody is facing the same issue?
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Old 13-04-2011   #9
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Re: Start&Stop in stop-and-go traffic

Whats wrong with using the parking brake?

Cheers

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Old 13-04-2011   #10
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Re: Start&Stop in stop-and-go traffic

Quote Originally Posted by sssfiat View Post
i am facing a serious problem with "start & stop" function while i m stopping at the hill then driving up a hill or slope. the car will roll back badly when the "star & stop" is running... it is scary and dangerous may i know anybody is facing the same issue?
i don't know if you have hillholder but it's quite serious if it doesn't work when S/S is active. if you don't have it, there's not much to do but to use handbrake as rallycinq mentioned (or just disable it manually). maybe next gen S/S will have built-in accelerometer to sense incline and disable itself automatically, unless hillholder comes as standart of course.
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Old 13-04-2011   #11
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Re: Start&Stop in stop-and-go traffic

Quote Originally Posted by durukan View Post
i don't know if you have hillholder but it's quite serious if it doesn't work when S/S is active. if you don't have it, there's not much to do but to use handbrake as rallycinq mentioned (or just disable it manually). maybe next gen S/S will have built-in accelerometer to sense incline and disable itself automatically, unless hillholder comes as standart of course.
I think the hillholder only comes with the ASR - this is standard with the 1.4 but is optional extra on the rest of the models and it's priced reasonably.
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Old 13-04-2011   #12
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Re: Start&Stop in stop-and-go traffic

Quote Originally Posted by sssfiat View Post
i am facing a serious problem with "start & stop" function while i m stopping at the hill then driving up a hill or slope. the car will roll back badly when the "star & stop" is running... it is scary and dangerous may i know anybody is facing the same issue?
This is not an issue with start stop. EVERY car will role back when the engine is off on a hill. Use the handbrake.
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Old 13-04-2011   #13
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Re: Start&Stop in stop-and-go traffic

Quote Originally Posted by sssfiat View Post
i am facing a serious problem with "start & stop" function while i m stopping at the hill then driving up a hill or slope. the car will roll back badly when the "star & stop" is running... it is scary and dangerous may i know anybody is facing the same issue?
Do you have a manual transmission? S&S only kicks in when you're in neutral so shouldn't affect hill starts.

How does S&S work in an auto? Do you have to put it in park?
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Old 12-09-2011   #14
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Re: Start&Stop in stop-and-go traffic

Questions in post 1# are interesting can I ask the technically minded;

1) what harm can be done to the starter & engine with SS kicking in every 20 - 30 seconds ?

I know from reading Bosch bumph that the starter and Battery are heavy duty and if the Battery was to go low SS would disable.

2) what harm can be done to the Clutch if the clutch is kept pressed in for a minute at a time in SS traffic ?

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Old 12-09-2011   #15
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Re: Start&Stop in stop-and-go traffic

Quote Originally Posted by arorat View Post
Questions in post 1# are interesting can I ask the technically minded;

1) what harm can be done to the starter & engine with SS kicking in every 20 - 30 seconds ?

I know from reading Bosch bumph that the starter and Battery are heavy duty and if the Battery was to go low SS would disable.

2) what harm can be done to the Clutch if the clutch is kept pressed in for a minute at a time in SS traffic ?

Thanks
1. Some extra wear on the starter & soleniod, though as you say these components should have been 'beefed up' to compensate. Another issue which actually concerns me more is that the fuel management system probably injects a little extra fuel when starting the engine, and this excess fuel could wash oil off the bores & pass unburnt into the catalytic converter - both things you don't want to happen. Also this could actually mean you end up using more fuel, not less, if the engine is continually restarting within a few seconds of it stopping. I'd be really interested to know the 'break-even' time when the fuel saved from stopping the engine idling equals the extra fuel needed to restart it.

2. If the clutch pedal is fully depressed then there shouldn't be any clutch drag & the only component subjected to extra wear will be the clutch release bearing. These can and do fail & it will be interesting to see how many high mileage S/S cars develop a rattle when the clutch is engaged.

I like having S/S & miss it on the Panda - it's a pain to lose all the electrics when turning the engine off manually in stationary traffic. I do occasionally disable it in creeping traffic, and will sometimes keep the clutch down to prevent it engaging - but only for a few seconds at a time. I'd really like a manual override, with an activation button on the steering wheel, so that I could decide myself when to stop the engine - there's no way the car can know how long it'll be before the engine will be needed again, but I can usually make a pretty good guess. I'd also like to be able to inhibit restarting when freewheeling the car downhill with the engine off - I'm sufficiently experienced to be able to cope with any loss of brake servo vacuum.
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