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Old 18-02-2015   #1
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Permanently disable start/stop?

Hi,

Just wondering if it's possible to permanently disable the start/stop function? I know you can switch it of, but you have to do it every time you start the car.

Is there a fuse you can pull, a setting you could change, a wire...


Cheers
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Old 19-02-2015   #2
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Re: Permanently disable start/stop?

Hello,

As far I know, no.
Tried with MultiECUScan that added this feature recently, but effectively no more start and stop (button don't operate anymore) but when you turn the key to start.. nothing.
Accorded to MES forum, different wirings with and without SS.

So I am working on a Memory Module that hold start stop stop between starts. But you have to remove radio and radio holder to access wiring harness and install it. I will post on FF when it will be ready.
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Old 19-02-2015   #3
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Re: Permanently disable start/stop?

You could remove the cable from the clip on the battery, this would stop it cutting out.

However, you would get the warning triangle on the dash, and also I'm not sure of any long term impacts this may have, so do so at your own risk.
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Old 19-02-2015   #4
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Re: Permanently disable start/stop?

Quote Originally Posted by jw4821 View Post
You could remove the cable from the clip on the battery, this would stop it cutting out.

However, you would get the warning triangle on the dash, and also I'm not sure of any long term impacts this may have, so do so at your own risk.
As you say not a good idea, it put the system in error and give warning on the dash (and message on displays on cars with them).

Don't know if this sensor is used by other modules to know the voltage of the battery.
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Old 20-02-2015   #5
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Re: Permanently disable start/stop?

Cheers guys,

Not really that obsessed with it, bout would like to have the option to permanently switch it off...

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Old 20-02-2015   #6
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Re: Permanently disable start/stop?

I believe if you get the car serviced by Fiat and they complete a software update (you might have to ask for this) it should default on start up to the mode it was in when switched off.

Why do you want to disable it though? Can't see the logic myself personally.
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Old 20-02-2015   #7
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Re: Permanently disable start/stop?

I already asked when serviced - no update for my car ECU (1.4 77HP).
But I see on a 135 the start stop state is memorized between starts.

Why disabling it ? Because I drive mainly on small road with a few cars. When I have a crossroad and I have to wait 5 seconds, I think it don't worth to stop my engine - use the starter motor one more time - stress battery and use electricity to spare 3-5 seconds of gas at idle.
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Old 20-02-2015   #8
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Re: Permanently disable start/stop?

Quote Originally Posted by Most Easterly Pandas View Post
Why do you want to disable it though? Can't see the logic myself personally.
Quote Originally Posted by Mkala View Post
Why disabling it ? Because I drive mainly on small road with a few cars. When I have a crossroad and I have to wait 5 seconds, I think it don't worth to stop my engine - use the starter motor one more time - stress battery and use electricity to spare 3-5 seconds of gas at idle.
What he said, also I commute through town with lots of stop and go, the battery wouldn't get charged enough, plus I think a few seconds of idle is better on fuel than a restart.

EDIT:
Blimey!
A quick google shows that it's more fuel efficient to kill the engine rather than idle for 10s.
I'll still stand by the battery charging theory, until proven otherwise.
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Last edited by dyzio; 20-02-2015 at 15:48.
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Old 20-02-2015   #9
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Re: Permanently disable start/stop?

Quote Originally Posted by Mkala View Post
Why disabling it ? Because I drive mainly on small road with a few cars. When I have a crossroad and I have to wait 5 seconds, I think it don't worth to stop my engine - use the starter motor one more time - stress battery and use electricity to spare 3-5 seconds of gas at idle.
Its not that big an engine so battery stress is going to be minimal, if it won't be able to cope then SS auto disengages.

If you've a manual car then just keep your foot on the clutch when waiting to dart across a cross road. If you're there long enough to put it into neutral and lift off the clutch then it will be saving you fuel overall.

Quote Originally Posted by dyzio View Post
What he said, also I commute through town with lots of stop and go, the battery wouldn't get charged enough
But it does, if the battery isn't charged enough then the SS system will not disengage, your type of driving is exactly what SS is designed for, and as you've mentioned with your edit it won't be using any more fuel.
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Old 20-02-2015   #10
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Re: Permanently disable start/stop?

Quote Originally Posted by Most Easterly Pandas View Post
Its not that big an engine so battery stress is going to be minimal, if it won't be able to cope then SS auto disengages.

If you've a manual car then just keep your foot on the clutch when waiting to dart across a cross road. If you're there long enough to put it into neutral and lift off the clutch then it will be saving you fuel overall.
I searched and learned a lot about Stop Start systems, starter and battery are reinforced types (starter cost 3 to 4 times more !).
But main reason for SS to be is for car makers : they can validate test cycle with less Co2 emissions, this resulting in a lower costs/tax to buy the car.
However, even enhanced flooded battery will not live as long as expected. Their life are still rated with a number of charge/discharge cycles, lowering this will result in more years with same battery.

Perhaps the main reason - is like you said - I have habit to put my car in neutral very early; so SS kick in (and I don't like this).
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Old 21-02-2015   #11
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Re: Permanently disable start/stop?

Get into the habit of not using neutral, I drive my mini all the time without start stop ever cutting in, because i am in the habit of sitting with my foot on the clutch when at junctions.

Would probably dissable it if you disconnected the outside temp sensor
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Old 21-02-2015   #12
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Re: Permanently disable start/stop?

If you have this habit to not using neutral for shorts stop, I think SS works great and it's designed in this way.
But maintaining clutch depressed for a while add wear to clutch mechanism too, it should not be done for long periods. But you will say for longer stops you will put in neutral - no clutch mechanism wear - SS kick in and all is working fine - This is the designed scenario.

SS is not a bad thing but perhaps it don't fit short commutes like I do most of the time. I make few kilometers, engine is most of the time not in operating temperature and adding stop/start in short trips will result in a lot of starts for few kilometers done. Start Stop unit have to make a compromise with all cars parameters (long list, see manual) including state of charge of battery (constant monitoring of voltage and in/out current). For me, disabling it ensure the battery charge at it best, as electronics has not to choose between charging state and SS operation.
For other trips, longer and with a portion of little or biggest stop (railroad crossing, etc) SS can save a bit of fuel without putting too much stress on other components, as battery has lot of time to charge and starter motor should be capable of lot of cycles (if not, it will be costly - and not good ecologically, not sure fuel saved will cover gray energy to make a new starter and to recycle the old one).

This is a point of view about Start and Stop, related to short commutes. It's not "the truth", feel free to use SS, comment, and argue with what you think
Remember, Regata ES already had a kind of Stop Start, and it was abandoned for about 20 years before the actual "resurrection"... future will say if SS system is really useful.
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Last edited by Mkala; 21-02-2015 at 08:08.
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Old 24-02-2015   #13
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Re: Permanently disable start/stop?

Keeping the clutch pressed wears out the throwout bearing. in short you will replace the clutch much earlier.. like half the time.
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Old 24-02-2015   #14
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Re: Permanently disable start/stop?

Quote Originally Posted by aurick86 View Post
Keeping the clutch pressed wears out the throwout bearing. in short you will replace the clutch much earlier.. like half the time.
We're talking keeping it down for a few seconds, when people don't want SS to engage, not minutes at a time when SS would be worth having kick in
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Old 24-02-2015   #15
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Permanently disable start/stop?

Quote Originally Posted by aurick86 View Post
Keeping the clutch pressed wears out the throwout bearing. in short you will replace the clutch much earlier.. like half the time.

It's a bad habit of mine I sit on the clutch a lot.

My Punto had covered over 100,000miles 60,000 with me when the clutch was replaced and that was for an worn out clutch, the bearing was fine but still changed as part of the new clutch kit. One of my previous cars a mondeo I had for years and covered about 90,000 miles in it and never needed a new clutch that one died when bambi made a suicide bid across the road in front of me a smashed the bonnet headlights bumper and one of the wings, it had 150,000miles on the clock and another 10,000 that had fallen off the clock

I agree it can lead to the bearing wearing out quicker but these are made of much stronger stuff than in years gone by and as MEP pointed out we are talking about when sitting in traffic for 30 seconds not 5 minutes
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