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Old 4 Weeks Ago   #1
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Twin air misfires when half.warm.. common

Hi.

We bought a VERY low mile 63 plate in the summer.

Running well indicated 54mpg over last 3k miles.. and freeing off nicely.

HOWEVER.. when left for a couple of hours after a decent drive it stutters.. almost 'hunts' ( under load) for around a minute.. then is fine again.

All fluids and temps seem good

No warning lights .. and it was 10k mile serviced by the FIAT:alfa specialist on purchase.. so oil grade should be A1

Anybody seen this before?

My punto TA (2012) has NEVER even hinted this in 50k..

Im tempted to try my MES.. but it may not be up to date enough for the ECU write.

Suggestions please.

Still got 4 weeks warranty left..
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Last edited by varesecrazy; 4 Weeks Ago at 21:36.
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Old 4 Weeks Ago   #2
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Re: Twin air misfires when half.warm.. common

If had to guess, temperature sensor, lambda sensor, coils, plugs, clean uniair filter. Try super unleaded. Drive like your hair's on fire. You wouldn't want to lend it me put it that way. Merry Christmas. Use either of existing cars for now. Believe you have a Panda 169 Multijet?!
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Old 3 Weeks Ago   #3
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Re: Twin air misfires when half.warm.. common

When I had mine it coughed and stumbled a bit at around 13k, it really sounded a bit sick sat idling in traffic.

I changed the plugs and it all went back to normal.
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Old 3 Weeks Ago   #4
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Quote Originally Posted by Goudrons View Post
When I had mine it coughed and stumbled a bit at around 13k, it really sounded a bit sick sat idling in traffic.

I changed the plugs and it all went back to normal.
I can MAKE the punto do that

Forgetting about the clutch switch..and giving a whiff of throttle while clutch bites.. can drag revs too low and it chuffs a bit


With the panda..its just pulses of power

1st 2nd gear for 100 yards.. then its away again..
Been stood for 2 hours at that point.

After 1 hour its fine..


Will have to try and read some temp feedback
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Old 3 Weeks Ago   #5
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Re: Twin air misfires when half.warm.. common

What happens if you reset the ECU by disconnecting the battery for a while?

gr J
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Old 3 Weeks Ago   #6
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Quote Originally Posted by A3jeroen View Post
What happens if you reset the ECU by disconnecting the battery for a while?

gr J

Im tempted to do that when Im back with it
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Old 3 Weeks Ago   #7
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Re: Twin air misfires when half.warm.. common

Most of the TwinAir problems comes from inferior fuel or wrong oil.

I always use Ron 98 or more and mine go's like stink, and i'm running with 110 hp. (custom Map)
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Old 3 Weeks Ago   #8
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Quote Originally Posted by The Pretender View Post
Most of the TwinAir problems comes from inferior fuel or wrong oil.

I always use Ron 98 or more and mine go's like stink, and i'm running with 110 hp. (custom Map)
Its on the same fuel ..and oil..

As my punto has always been on.

The mrs did comment recently though that she had to do a quick top.up at a uk supermarket.

When I refilled at the normal place she said it was better than the stuff she had bought.

None of this has changed the half.warm judder..



The aim of this thread was to make sure it wasnt a known issue..
Software update required..etc

As the car has such low use its not been in a FIAT dealer for years...

I will call the specialist we bought it from for advice.
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Last edited by varesecrazy; 3 Weeks Ago at 12:13.
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Old 2 Weeks Ago   #9
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Re: Twin air misfires when half.warm.. common

Update.

Did it over xmas..in varied locations.

So definitely not right

Booked in for attention.

But have reset via power down.. will see how it goes..

And update
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Old 2 Weeks Ago   #10
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Re: Twin air misfires when half.warm.. common

If you've any warranty left get to a dealer and have them check Uni-air system. My 4x4 had misfire symptoms, did the coil pack swap, spark plug thing but always remained and on same cylinder. Dealer replaced unit and all was well (my bank balance aside since it was out of warranty), dealer suggesting it was oil contamination.

These units (http://www.imparts.com.au/index.php?id=425 )seem incredibly sensitive to oil type, level etc. Don't go cheap on oil changes!
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Old 2 Weeks Ago   #11
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Quote Originally Posted by Panda IIs View Post
If you've any warranty left get to a dealer and have them check Uni-air system. My 4x4 had misfire symptoms, did the coil pack swap, spark plug thing but always remained and on same cylinder. Dealer replaced unit and all was well (my bank balance aside since it was out of warranty), dealer suggesting it was oil contamination.

These units (http://www.imparts.com.au/index.php?id=425 )seem incredibly sensitive to oil type, level etc. Don't go cheap on oil changes!
Its now covered 16k

And is fine hot..or cold

Oil is the correct grade of selenia

95% sure its a temp sensor..

But its going in on monday for checks

(Power down made no difference.. )
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Last edited by varesecrazy; 2 Weeks Ago at 15:09.
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Old 1 Week Ago   #12
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Re: Twin air misfires when half.warm.. common

Well.

Its been in the garage..

No stored codes
( not unexpectedly as no MIL..)

SO .. they charged me for supply and fitting of new sparkplugs.. without asking!!

Time will tell if its any better.
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Last edited by varesecrazy; 1 Week Ago at 17:04.
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Old 1 Week Ago   #13
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Re: Twin air misfires when half.warm.. common

Quote Originally Posted by varesecrazy View Post
Well.

Its been in the garage..

No stored codes
( not unexpectedly as no MIL..)

SO .. they charged me for supply and fitting of new sparkplugs.. without asking!!

Time will tell if its any better.
Any further news?
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Old 1 Week Ago   #14
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Re: Twin air misfires when half.warm.. common

@varesecrazy take it the plugs and work done has guarantee on it in case doesn't make any difference?
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Old 1 Week Ago   #15
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Re: Twin air misfires when half.warm.. common

Not used it the same..

Should know by the weekend.
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