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Hi, for several months now my Rio 1.3 LE+ has a moment where
the engine seems to possibly miss-fire or hiccup;



This only occurs after turning a corner left or right i.e. having the steering
hard over then proceeding to accelerate in 2nd or 3rd gear, it seems the car
cuts out or miss-fires for a fraction of a second.



Unsure what its doing, engine management is not reporting any issues, I have a
CAN dongle plugged in which is linked to my phone using Torque real-time
software which has not yielded any useful data.



The garage cant find an issue, my only other option is to pay a specialist
engine tuning company to road test the car with all the tech for real-time data
logging but this is not an option at present due to lack of funds.



So, to summarise;



if I take a roundabout or junction from either a complete standstill or low
speed, once the steering is straightened and I put my foot down typically in
2nd or 3rd gear the engine appears to cut out or miss-fire giving a slight jerk
forward.



Thanks for reading, any advice welcome.



Rob.
 

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Hi Rob,


It isn't something silly like a build up of a bit of water in the bottom of your tank that is being disturbed as you go round sharp corners.



Bruce
 

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Discussion Starter · #3 ·
Hi Bruce, I never thought of that. How can I check? I am due to fill up tomorrow as the tank is nearly empty, is there any way of checking inside the tank?

Best Regards

Rob.
 

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Hi Rob, I have the same problem! It's been with the car since I bought it 3 yrs and 50000 miles ago. It does not seem to do it on mine if I keep the tank full for some strange reason. It is very annoying tho
and I can predict prety much when it will happen. Turn right at a roundabout and accelerate gently away 'hiccup'. Turn right at a junction and 'hiccup'. Grrrr. Not every time which makes it all the more irritating. The Kia dealer says it's supermarket petrol, which I don't buy. I've checked the usual culprits like the wiring loom near the cooling fan but apart from keeping the tank full I've no answer.
Let me know if you find a cure.

Phil
 

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Discussion Starter · #5 ·
Cheers for that Phil.
Well here is what I have done to try and resolve it;
Tank was nearly empty, fuel light not on but was below the end line. Bought a tin of VX100 Fuel treatment from Euro Car Parts for £6.50.
Took it for a good thrash up and down the A1M for about 10miles until the fuel light came on then drove to my local shell garage to fill up.
Never used Supermarket fuel for over 6 months now.

It has not played up today so far, I will re-post once I have more information.

All the best

Rob.
 

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Hi Rob,


I googled about water in petrol and many (US) sites were suggesting using injector cleaner which is alcohol based. So the water mixes with the alcohol , and the alcohol mixes with the petrol.



(so that could be your fuel treatment).



Hope it keeps behaving itself.



Bruce
 

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A diesel mechanic told me years ago Methylated spirits is another one to rid water out of diesel and petrol.
 

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Discussion Starter · #8 ·
Cheers for the advice guy's, the fuel treatment was meant to be used with 60-70L fill up but as I had about 5 litres left in the tank I thought a strong, neat solution would give a better chance of success.

Fingers crossed this will be the end of it, I will repost either way over the next week or so.

All the best and Merry Christmas to you all.



Rob
 

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Discussion Starter · #9 ·
Update:

the problem seems to have been cured after placing a neat mix of VX100 Fuel treatment in a near empty tank and giving the car a good thrashing.

@Bruce you may well have been right r.e water in the tank.

@Phil my tank is near empty again and the problem has not repeated so far, maybe try this method and see if it works for you?

Thank you to all for help and advice.

Regards

Rob.

Edited by: rmullen57694
 

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That has given me hope Rob
I'll run down the tank and do the same.

CheersPhil
 

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I've had this problem before, it turned out to water in the fuel filter. The tank itself was ok. I changed it several months back and the misfire went away. Recently it seems to have come back again. My other half only uses supermarket fuel unfortunately.
Davy, methylated spirits is mostly ethanol with a bit of methanol or propan-2-ol thrown in. I might give it a go, although it could make the problem worse if it's in the tank too long as alcohol will pick up more moisture from the air over time.
 

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A quick question though, if there is water in the fuel tank or filter which is being pumped through the system and injected into the cylinders thus causing the misfire, wouldn't it cure itself when there is no water left? My Rio has had the same symptoms, neither worse nor better for 3 yrs and 50.000 miles and it annoys me a lot
so a simple fix like water in the fuel would be brilliant. I'm worried though that if water is being injected into the cylinders it must be being replaced in the tank somehow. Any thoughts anyone
?

Phil
 

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I think it will depend on how much the car is used, the grade of fuel and how full the tank is filled each time. When I found water in the filter canister, there were no obvious drops of water in the tank, although the petrol I draned did look odd when disturbed, as if something was just about to separate out. Ethanol is being added to petrol and this tends to pick up water over time.
I do wonder though if there is something wrong withan engine position sensor, or something with the ECU.
 
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