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PostPosted: Fri Jan 12, 2018 11:27 am 
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Joined: Thu Jan 11, 2018 8:07 pm
Posts: 2
Drives: 2011 Aygo
I have an intermittent loss of power and engine cutting out with my 2011 Aygo 1L petrol. I can be OK for days but then will loose power and eventually stop. This usually happens at 70 MPH on the motorway. After 10 minutes it will restart but has little power for the first minute or two, but after this will run as normal. I have attached an OBD2 code reader but it shows no fault codes or freeze frame data. Anyone else had a similar fault?


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PostPosted: Mon Jan 15, 2018 11:13 am 
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Joined: Fri Jun 24, 2016 1:53 pm
Posts: 80
Drives: Aygo 2009
no codes, power loss at high load/high rpm... looks like a fuel pressure problem to me.
Either fuel pump, filter, or pressure regulator. Check fuel pressure with the manometer, or start swapping parts (filter first, then the pump).

best,

RL


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PostPosted: Mon Jan 15, 2018 12:12 pm 
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Joined: Wed Jun 21, 2017 11:02 am
Posts: 51
Location: Maidenhead, Berks
Drives: C1 splash & Vtr+
Agree with above comment-crank sensor would display similar problems but NOT react slowly after a re-start, so it sound like weak fuel pressure- also check plugs and air-filter are in good order before investigating the fuel issue. None of the above would throw an obd code


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PostPosted: Sat Jan 20, 2018 4:19 pm 
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Joined: Thu Jan 11, 2018 8:07 pm
Posts: 2
Drives: 2011 Aygo
I agree it sounds like a fuel problem. It was recently serviced and the plugs and air filter replaced. I don't have a manometer or any suitable pressure gauge so I'll probably start by replacing the fuel filter.


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PostPosted: Sat Jan 20, 2018 10:41 pm 
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Joined: Sun May 06, 2012 4:19 pm
Posts: 4053
Drives: 2006 C1
My manual only goes to 11 can’t see the fuel filter, were is it fitted?


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PostPosted: Sat Jan 20, 2018 10:54 pm 
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Joined: Sun May 06, 2012 4:19 pm
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Drives: 2006 C1
How about the fuel venting system? Could that have anything to do with it,
Excuse my ignorance can’t be of any help just reading from my manual


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PostPosted: Sun Jan 21, 2018 10:51 am 
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Joined: Wed Jun 21, 2017 11:02 am
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Location: Maidenhead, Berks
Drives: C1 splash & Vtr+
Fuel filter is integral to pump/sender unit in tank-complete unit
Have you used supermarket fuel lately? Known to be poor quality
Also stick a bottle of redex in to See if its injectors


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PostPosted: Sun Jan 21, 2018 1:29 pm 
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Joined: Sat Mar 28, 2015 3:25 pm
Posts: 236
Location: Aberdeen...
Drives: 107 Urban '09
Higher octane fuel will run cleaner but there's no/little actual evidence that supermarket fuels will damage cars. Has to conform to the same standards of petrol/diesel, after all. The additives in Shell/BP/etc are what you're paying the couple pence extra for.

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PostPosted: Sun Jan 21, 2018 5:21 pm 
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Joined: Sun May 06, 2012 4:19 pm
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Drives: 2006 C1
Can’t see “Supermarket” Petrol being the reason for this, more owners would be reporting it for a start.
It would also be a easy common denominator. Unless he’s filling up with rubbish Petrol all the time, which is highly unlikely. Redex may help though.


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PostPosted: Mon Jan 22, 2018 7:50 am 
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Joined: Sat Oct 14, 2017 7:59 pm
Posts: 28
Drives: C max
Similar symptoms I suffered a while back on a different car. I too think fuel supply problems. As brixtonboy suggests it could be fuel vent blocked. When you remove fuel cap do you get a big rush of air as if you have a vacuum in the tank? Worth checking if it stops on you again.
I've found references to fuel filters under the car NEAR the tank and under the bonnet just before the injector rail. I can't confirm. It's possible they aren't fitted to every model year. It's also possible that a previous owner has fitted one to cure a problem. Good luck.
Stefan

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