Register Login
Shop4Parts - UK's largest online superstore for FIAT and Alfa Romeo parts
Reply
 
Thread Tools
Old 10-02-2018   #1
Join Date: Dec 2017
Posts: 7
Thanks: 0
Trader Rating: 0
United Kingdom 
Panda Juddering around 30mph when slowing down

Hi Guys
Would be grateful for any advice / suggestions on this topic. My Panda slightly judders (my dad calls it a 'miss') at around 25-30mph when removing foot off throttle to slow down. This happens way before I touch the brake and usually occurs in 3rd or 4th gear. It is intermittent so I wasn't able to replicate the fault on the 5 minute test drive at my dealership who checked it & no fault codes came up so they changed the spark plugs but there is no improvement. I posted another topic here recently when a sensor failed and was replaced but not sure if this is linked. The car was last serviced 6 months ago.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

PandaRollin is offline Reply With Quote Quote 
Old 11-02-2018   #2
Moderator
Join Date: Mar 2010
Location: Dorset
Posts: 8,035
Thanks: 841
Trader Rating: 0
United Kingdom 
Re: Panda Juddering around 30mph when slowing down

Quote Originally Posted by PandaRollin View Post
so they changed the spark plugs
That's what I'd have done too.

It sounds to me like you have a slight misfire on the overrun; this was 'business as normal' in the days before sophisticated electronic fuel control systems.

A dubious lambda sensor could cause this, and if you've recently changed one, that's the first place I'd look, particularly if it's been replaced with an aftermarket part.

Thinking outside the box, could it possibly be a small leak in the exhaust system? Back in the day, it was commonplace to hear both cars & motorcycles doing this when fitted with aftermarket tuned exhausts.

Which engine have you got?
__________________


"Just 'cos you're not paranoid, doesn't mean they're not out to get you"


Last edited by jrkitching; 11-02-2018 at 08:14.
jrkitching is offline Reply With Quote Quote 
Old 11-02-2018   #3
Join Date: Dec 2017
Posts: 7
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: Panda Juddering around 30mph when slowing down

Hi, it's a 1.2 petrol.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

PandaRollin is offline Reply With Quote Quote 
Old 11-02-2018   #4
Moderator
Join Date: Mar 2010
Location: Dorset
Posts: 8,035
Thanks: 841
Trader Rating: 0
United Kingdom 
Re: Panda Juddering around 30mph when slowing down

Quote Originally Posted by PandaRollin View Post
Hi, it's a 1.2 petrol.
The OEM plugs on the 1.2 are cheap rubbish; fitting iridium replacements helps (and you won't need to touch them again for another 60,000 miles), but I'd still expect a brand new OEM set to work properly.

My concern would be potential long term damage to the catalytic converter, if it's misfiring due to excess fuel.

If it's still under warranty, take it back to the dealer as "they don't all do this, sir".

Otherwise, you may just have to wait until it gets worse, in which case it'll likely throw up a fault code to give you a better idea of where to look.
Likes PandaRollin liked this post
__________________


"Just 'cos you're not paranoid, doesn't mean they're not out to get you"


Last edited by jrkitching; 11-02-2018 at 08:23.
jrkitching is offline Reply With Quote Quote 
Old 11-02-2018   #5
Join Date: Dec 2017
Posts: 7
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: Panda Juddering around 30mph when slowing down

Ok will do many thanks
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

PandaRollin is offline Reply With Quote Quote 
Old 11-02-2018   #6
2014 Panda Lounge 1.2
 
murphyv310's Avatar
Join Date: Aug 2010
Location: Kilmarnock
Posts: 896
Thanks: 55
Trader Rating: 0
murphyv310 has donated!
murphyv310 is an honorary friend of the forum :)
United Kingdom 
Re: Panda Juddering around 30mph when slowing down

Hi.

Give the throttle body and throttle flap a good clean with carburettor cleaner, also check the MAP sensor is not oiled up, mine was and after fitting an oil catch tank after a month or two this issue went away completely.
The other thing I find is cold and damp weather can cause little misses, this goes if you get some alloy air intake tubing and remove the air cleaner box inlet pipe and swap it with the tubing and carefully bend it to suck in some warm air from the exhaust manifold/exhaust.
Ideally these need a thermostatic air intake, cold for hot days and hot for cold and damp days just like many cars were in the old days.
My 1.2 is now a really quick little car, feels totally different to what it was a year ago.
Oh And I have Iridium plugs too.
Likes PandaRollin liked this post
__________________

Cheers Trevor
murphyv310 is offline Reply With Quote Quote 
Old 13-02-2018   #7
2014 Panda Lounge 1.2
 
murphyv310's Avatar
Join Date: Aug 2010
Location: Kilmarnock
Posts: 896
Thanks: 55
Trader Rating: 0
murphyv310 has donated!
murphyv310 is an honorary friend of the forum :)
United Kingdom 
Re: Panda Juddering around 30mph when slowing down

Hi.
In addition to my last post I forgot to say that the fuel consumption on mine has gradually improved over the last few months, I'm surprised that in this cold weather it is still improving, I would have thought it would have dropped.
I have found that the catch tank catches a fair amount of water no doubt from condensation in the cold weather, just makes me think this could be detrimental to the oil and cause more engine wear.
Likes PandaRollin liked this post
__________________

Cheers Trevor
murphyv310 is offline Reply With Quote Quote 
Reply
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump
Similar Threads
Thread Thread Starter Forum Replies Last Post
(T) car juddering feeling like its stuggling to get to 30mph?? kath2 Punto (Mk2/2b) 38 23-02-2014 20:48
(G) Help! Juddering at 1500rpm at 30mph :o( JohnRCook Doblo 9 24-10-2010 13:23
(G) Panda juddering? Help... Wee Nic Panda 5 09-03-2010 13:08
(G) juddering panda pantalaimon Panda 1 20-01-2008 16:25
(G) Driving at 30mph Advanced Driver Cinquecento / Seicento 5 08-02-2004 15:15