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Old 15-12-2013   #1
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Euro6 1.2 Throttle Response, Hill Start Issues & Watchdog report

My wife has just bought another 500.We had a 1.2 Lounge and now a 1.2 S.I am finding the throttle responce very slow and is getting to be a problem when pulling out of junctions.This was never a problem with the Lounge.Does the car need a visit to the dealer or is this how new 500s are.
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Old 15-12-2013   #2
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re: Euro6 1.2 Throttle Response & Hill Start Issues

Have you got different size wheels to the old car?
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Old 15-12-2013   #3
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re: Euro6 1.2 Throttle Response & Hill Start Issues

Could be just that it's new and needs to be run in and loosened up whereas you were used to the lounge which I'm guessing had a few thousand miles up at least? There's a marked difference between a new 1.2 and one with a few K.
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Old 15-12-2013   #4
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re: Euro6 1.2 Throttle Response & Hill Start Issues

Quote Originally Posted by Mercky View Post
Could be just that it's new and needs to be run in and loosened up whereas you were used to the lounge which I'm guessing had a few thousand miles up at least? There's a marked difference between a new 1.2 and one with a few K.
There is, there's also a different between going from 14 to 15" wheels and then about the same going from 15 to 16 " wheels
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Old 15-12-2013   #5
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re: Euro6 1.2 Throttle Response & Hill Start Issues

Its the same when in neutral put your foot to the floor and there is a delay before the engine revs up.
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Old 15-12-2013   #6
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re: Euro6 1.2 Throttle Response & Hill Start Issues

dealer visit,
sounds like it could be unsafe,
Charlie
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Old 15-12-2013   #7
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re: Euro6 1.2 Throttle Response & Hill Start Issues

How much of a delay are we talking about?
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Old 15-12-2013   #8
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re: Euro6 1.2 Throttle Response & Hill Start Issues

Quote Originally Posted by 306maxi View Post
There is, there's also a different between going from 14 to 15" wheels and then about the same going from 15 to 16 " wheels
You'll have to explain this one to me, please. I'd have to look up 14" tyre size for 500, but having personal experience there is hardly any difference in rolling radius of the 185/55 R15 and 195/45 R16, in fact it's slightly in favour of 16's.

So, as far as I'm aware moving from 15's to 16's fitted by FIAT would have no effect on throttle response of a 500

Cheers

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Old 15-12-2013   #9
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re: Euro6 1.2 Throttle Response & Hill Start Issues

only a split second but not had this on a car before and the Lounge was fine.I think it must be a comms issue between the throttle pedal and ECU.
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Old 15-12-2013   #10
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re: Euro6 1.2 Throttle Response & Hill Start Issues

It's nothing to do with rolling radius, it's down to rolling resistance and weight.


14" 175/65 R14 82T
15" 185/55 R15 82H
16" 195/45 R16 84H


The bigger wheels use a wider tyre which increases rolling resistance. 16" wheels also use 84 load rating tyres which will be slightly heavier than 82 rated ones.


The biggest difference is in the weight of the rim. 14" steel wheels with tyres weigh sod all, 15" alloys weigh more and 16" alloys weigh an absolute tonne with tyres fitted.


These two things couple together to make quite a big difference, I find myself getting at least a 10% difference in fuel economy going from a smaller size to my summer tyres on 16's. This is over 60k miles of usage.
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Old 15-12-2013   #11
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re: Euro6 1.2 Throttle Response & Hill Start Issues

pretty much what I was thinking ; - }
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Old 15-12-2013   #12
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re: Euro6 1.2 Throttle Response & Hill Start Issues

I am prepared to be shot down ...does it have an eco button ? Mine does and when using it it is slightly slower to pull away..
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Old 15-12-2013   #13
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re: Euro6 1.2 Throttle Response & Hill Start Issues

1.2's don't have an eco button, only twinairs
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Old 15-12-2013   #14
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re: Euro6 1.2 Throttle Response & Hill Start Issues

Quote Originally Posted by werdna View Post
I am prepared to be shot down ...does it have an eco button ? Mine does and when using it it is slightly slower to pull away..
I think that's only the TA that does that, my lounge TA certainly does.
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Old 15-12-2013   #15
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re: Euro6 1.2 Throttle Response & Hill Start Issues

Nothing to do with wheel size though if the op can replicate the problem in neutral.
It's some sort of pedal to throttle problem.
1.6 Stilo's were dreadful in this respect. In mine I could floor the pedal and bring it up again before the engine responded making quick getaways at junctions a nightmare. Ok if you were stopped at lights and had time to get the engine sorted.
I changed the 16 inch wheels on my Mito for 18's and yes it felt ever so slighly less nippy, but caused not problems whatsoever.
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