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Old 25-05-2018   #1
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Twinair hesiting/misfiring when accelerating

As post header says our Panda Twinair(2012) has developed a misfire severe enough to bring on the triangle of doom,my local service garage has no idea where to start,any ideas or help?.
Thanks,Graham
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Old 25-05-2018   #2
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Re: Twinair hesiting/misfiring when accelerating

Sounds like a coil pack or a spark plug has failed. My money is on a coil. Replace them both and get the code cleared. Very quick job to replace them.
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Old 25-05-2018   #3
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Re: Twinair hesiting/misfiring when accelerating

You might want to try new plugs first, my old TA started stuttering a bit and new plugs saw the back of it.

Coils have been known to fail and there were problems with early ones I believe.

But, more worrying, there are reports this is the sort of behaviour you get when the Multiair unit fails.

There's quite a few post on this and Alfa Owners site (Mito used the TA engine) regarding it, worth a search and a read
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Last edited by Goudrons; 25-05-2018 at 13:39.
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Old 25-05-2018   #4
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Re: Twinair hesiting/misfiring when accelerating

Quote Originally Posted by Graham GB View Post
As post header says our Panda Twinair(2012) has developed a misfire severe enough to bring on the triangle of doom,my local service garage has no idea where to start,any ideas or help?.

Thanks,Graham


Yep first call would be plugs n coils, use iridium plugs if you can as theyll last longer. Failing that Id bring it to a garage or fiat specialist that understands the twins, if your local garage hadent a clue where to start then its not the best place for further investigation
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Old 25-05-2018   #5
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Re: Twinair hesiting/misfiring when accelerating

Thanks for the replies,i've ordered the iridium plugs & i'll go from there
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Old 29-05-2018   #6
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Re: Twinair hesiting/misfiring when accelerating

Don't want to be doom monger but consider the Uniair module...

How many miles has it done, and has the servicing been kept up?

Hope its the plugs
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Old 31-05-2018   #7
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Re: Twinair hesiting/misfiring when accelerating

Quote Originally Posted by Panda IIs View Post
Don't want to be doom monger but consider the Uniair module...

How many miles has it done, and has the servicing been kept up?

Hope its the plugs
Plugs will be fitted this week,but of course it's stopped hesitating the last couple of days.

Year is 2012 mileage 55K,what is the UNIAIR module?,sounds disastrous & could that be linked with an air-con problem?.
Thanks for the replies.
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Old 31-05-2018   #8
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Re: Twinair hesiting/misfiring when accelerating

The Uniair/Multiair unit is a mechanism the works between the cam and the intake valves to adjust the valves timings.

It uses solenoids to control oil within passageways that act as a fluid link between cam and valve.

It basically uses engine oil as a push rod on the valves.
Altering the pressure of the oil alters the link, thus altering the valve timings.

There have been reports of failures, not many but they are starting to grow.

It's relies on the correct spec and amount of engine oil as it's this that it picks up to act as a fluid link, so it's worth checking and topping up the oil if it's a little low.

There's also a small oil strainer within the system, they can get a bit dirty and it's worth a clean every 30,000 miles or so, and no they aren't part of the service schedule.
https://www.fiatforum.com/panda-iii/...il-filter.html
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Old 31-05-2018   #9
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Re: Twinair hesiting/misfiring when accelerating

Very glad for you that it is the plugs.

As Goudrons says, the uniair module essentially does away with the inlet valve cam and allows ariable valve timing and opening to optimise engine performance (or more specifcally immissions I believe - the two don't go hand-in-hand!).


There's a very good link somewhere on this forum to the OEM suppliers data sheet for this module which sits on the top of the engine. Oil and oil spec is everything for the performance of this system; do not cut corners with cheap oil!


The symptoms of this unit failing are hesitancy, missing on one cylinder and associated engine warnings...


Sorry but has nothing to do with aircon...
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Old 31-05-2018   #10
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Re: Twinair hesiting/misfiring when accelerating

Quote Originally Posted by Goudrons View Post
The Uniair/Multiair unit is a mechanism the works between the cam and the intake valves to adjust the valves timings.

It uses solenoids to control oil within passageways that act as a fluid link between cam and valve.

It basically uses engine oil as a push rod on the valves.
Altering the pressure of the oil alters the link, thus altering the valve timings.

There have been reports of failures, not many but they are starting to grow.

It's relies on the correct spec and amount of engine oil as it's this that it picks up to act as a fluid link, so it's worth checking and topping up the oil if it's a little low.

There's also a small oil strainer within the system, they can get a bit dirty and it's worth a clean every 30,000 miles or so, and no they aren't part of the service schedule.
https://www.fiatforum.com/panda-iii/...il-filter.html
Quote Originally Posted by Panda IIs View Post
Very glad for you that it is the plugs.

As Goudrons says, the uniair module essentially does away with the inlet valve cam and allows ariable valve timing and opening to optimise engine performance (or more specifcally immissions I believe - the two don't go hand-in-hand!).


There's a very good link somewhere on this forum to the OEM suppliers data sheet for this module which sits on the top of the engine. Oil and oil spec is everything for the performance of this system; do not cut corners with cheap oil!


The symptoms of this unit failing are hesitancy, missing on one cylinder and associated engine warnings...


Sorry but has nothing to do with aircon...
Thank you both,much appreciate your help,just to be clear,the hesitation has stopped occuring before i have had the plugs fitted,but there's is obviously something that needs attention.
It looks as though i need to find someone who specialises in this Car/Engine,other than my useless main dealer,who sold us the car new.
Can anyone recommend a suitable garage/service centre,we're based in the NW,but i'd consider travelling a distance to take the car to the right person.
Am i better starting a new thread about this?,i havn't even started on the air-con problem yet.
Cheers,Graham.
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Old 31-05-2018   #11
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Re: Twinair hesiting/misfiring when accelerating

Maybe try this firm. Sounds perfect. http://www.ferdisgarage.co.uk
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Old 31-05-2018   #12
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Re: Twinair hesiting/misfiring when accelerating

Before you start thinking the worst, check your engine oil.
It's not easy with the TA, the dipstick is better than useless, but make sure it's up at or very near max.

Allow the oil to settle a while after driving before you check, say an hour or so.

If it's short on oil it can cause the Multiair to play up.
Just add a little at a time until it creeps up to the correct mark.


Anyone should be able to change the plugs for you.
There's nothing really tricky about it, with a few tools (10mm socket and a plug socket, see below) you could probably do it yourself.

The only fiddly parts are the air pipe to the turbo, it has a Clic R clip that can be a struggle to reclip again after (without the right tool).
You can bin it and fit a large jubilee clip though.

The plugs themselves require a thin walled plug socket to fit down the holes, they aren't expensive, Laser 3682 fits perfectly.

There are guides about that can help you with the job.

If after there's no difference, then think about getting someone to look at it.


What's wrong with the air con?
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Last edited by Goudrons; 31-05-2018 at 12:25.
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Old 31-05-2018   #13
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Re: Twinair hesiting/misfiring when accelerating

Quote Originally Posted by Goudrons View Post
Before you start thinking the worst, check your engine oil.
It's not easy with the TA, the dipstick is better than useless, but make sure it's up at or very near max.

Allow the oil to settle a while after driving before you check, say an hour or so.

If it's short on oil it can cause the Multiair to play up.
Just add a little at a time until it creeps up to the correct mark.


Anyone should be able to change the plugs for you.
There's nothing really tricky about it, with a few tools (10mm socket and a plug socket, see below) you could probably do it yourself.

The only fiddly parts are the air pipe to the turbo, it has a Clic R clip that can be a struggle to reclip again after (without the right tool).
You can bin it and fit a large jubilee clip though.

The plugs themselves require a thin walled plug socket to fit down the holes, they aren't expensive, Laser 3682 fits perfectly.

There are guides about that can help you with the job.

If after there's no difference, then think about getting someone to look at it.


What's wrong with the air con?
Thanks,Goudrons.I'll talk to my local garage,the Plugs are there & he's a good guy & see what we can come up with.
I read in a thread in the Forum talking about Fiat respecifiying the oil grade/type for the TA,i'll see if i can find it & work with the Garage to get it ordered & changed.
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Old 31-05-2018   #14
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Re: Twinair hesiting/misfiring when accelerating

My worry is that your local garage to quote your own words "has no idea where to start". Its like going to your GP with a serious and complex brain issue, he'd be out of his depth and would refer you to a specialist.
If this is the garage you use for servicing then reading between the lines they are unaware even that the TA needs the correct oil, let's hope they haven't been using Duckhams Q20-50.
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Old 31-05-2018   #15
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Re: Twinair hesiting/misfiring when accelerating

Quote Originally Posted by murphyv310 View Post
My worry is that your local garage to quote your own words "has no idea where to start". Its like going to your GP with a serious and complex brain issue, he'd be out of his depth and would refer you to a specialist.
If this is the garage you use for servicing then reading between the lines they are unaware even that the TA needs the correct oil, let's hope they haven't been using Duckhams Q20-50.
They have done 2 "services" & have used the oil "grade"specified in the owners book,but maybe not the exact brand.
I've just been reading through old threads trying to find the thread i read that stated Fiat had changed the spec of the oil(for the TA) & quite frankly having read through about 20 pages of posts,i have no idea which is the correct grade of oil for our 2012 TA.
What they would almost certainly not have known about is "resetting" the uniair module? & to be honest i'm not sure where i would find a "garage"who did know the answers.
I have no confidence that the Main dealer we bought the Panda from(we bought it new)would have carried out the servicing any better or without using "budget" oil.
So what i'm trying to do now is figure the "correct"oil(type & make) & then go from there.
I'm not sure what the situation is with resetting the UNI module,but i doubt it's ever been done.
But my local garage does have a lot of up to date Elecronic diagnostic machines etc,although they are not a Fiat garage,they are a specialist VW/Audi garage.
I'm now sort of armed with a little knowledge(which may or may not be correct)which is probably a dangerous thing,so i'll tread carefully.
I think i'm going to ask in a new thread about the definitive oil for my TA,unless someone reads this & answers it for me.
Wish me luck i'll need it,but i'm persistent enough to get there.
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