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Technical any ideas what this problem could be?

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Technical any ideas what this problem could be?

craig20102010

craig20102010

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Parked in the garage
Joined
May 26, 2009
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427
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Location
Middlesbrough, Wittering
im having a problem with power when im driving at a constant speed.. e.g ill be driving home at like 60mph or 70mph as long as i keep that contant at least once on the way back the engine will do something strange...

it has to of been running for a while like around 1hour before it does it..

what happens is the engine starts to loose power and feels like its tryin to stall.. as if there was something dropping down under the engine and causing drag but i know thats not the case everythings fine..

feel it shakin on the steering wheel and i can feel it a bit through the floor of the car and on the pedals. its like a strange vibration then it goes away after its done that for bout a minute but the car does go sluggish..

took it to fiat twice and they put it on the computer and it doesnt find anything but obviously it wouldnt because i have no engine managment lights on or anything.. so they just come back and say no fault found.. and it doesnt do it on short runs so they aint going to experience it..

i need help Any ideas what it could be causing it???
 
Is this an Mjet, Tjet or 1.4 16v? Any mods to the car? Is it only at those speeds?

I know there are some issues with the DPF on the 1.6 Mjets. There is a thread about that somewhere.

Whatever it is, good luck (y)
 
T14086 said:
sticky EGR,AFM both these dont give errors often.

Just because there was no errors it means nothing, garage should be taking a closer look at parameters.
Click to expand...

i agree... i feel like im bothering them more then anything.. strange thing is they speak to me like they have never herd of this problem before... but lookin at the topic on the DPF that sound exactly like what mine is doing! and it would make alot of sense! since i drive at a constant 60mph meaning the exhaust gasses might not be getting hot enough for it to complete a regeneration process or meanin its having to take fuel from the engine to create more heat causing it to loose power!

i think i will book it in again and run this by them and speak to them about the EGR valve as well.
 
Your not bothering them, you can even point them to this forum if they start getting patronising;). (on the opther side though they cant spend hours looking for fault that only occurs every so often as they wont get paid for it)

There is a software update for the 2.0 by the way.
 
T14086 said:
Your not bothering them, you can even point them to this forum if they start getting patronising;). (on the opther side though they cant spend hours looking for fault that only occurs every so often as they wont get paid for it)

There is a software update for the 2.0 by the way.
Click to expand...

an ECU update? i think they did that last time.. i didnt notice a single thing when they did it lol.. i was actually under the impression they just told me that to keep me quiet.

if they updated my ECU would all of my clocks been reset? mine were all exactly the same after they done it which i thought was weird or does the trip computer run off something completly seporate to the ECU?
 
I'm getting the same issue with my 2.0Mjet 165.

This has only started happening in the last couple of weeks. The car is 6 months old and I have just over 10k on the clock.

On a handful of occasions I've had light juddering when driving in 4th, 5th and 6th gear at a constant speed. If I try and accelerate the slight juddering gets worse and you can really feel the car shaking and get no extra power. It's very disconcerting.

I do a mixture of town and motorway driving and regularly drive at least 30 minutes on the motorway.

If this is a DPF regeneration that hasn't completed is there any general advice for what to do when I get this which will ensure the regeneration completes successfully?
 
mikey mikey mikey said:
Here is the other thread about the DPF. I don't know if this is relevant to the 2.0 Mjet, but as it is still a fairly new engine (I believe) it might be the cause if the issue.


https://www.fiatforum.com/bravo/208521-bravo-1-6-eco-dpf-problems-misfire.html

Hope this helps somewhat (y)
Click to expand...

i think this is the problem and im going to get it booked in at the garage again and point them in the direction of this.. but lookin at that thread they cant fix it anyway or dont know how to sort that problem out..

it is incredibly annoying.. and its not doing my fuel eco any good!
 
craig20102010 said:
an ECU update? i think they did that last time.. i didnt notice a single thing when they did it lol.. i was actually under the impression they just told me that to keep me quiet.

if they updated my ECU would all of my clocks been reset? mine were all exactly the same after they done it which i thought was weird or does the trip computer run off something completly seporate to the ECU?
Click to expand...

Ask for copy of printout, it's politness to leave a copy in your service book/glovebox etc for your reference.

(clocks not reset)
 
JFL said:
am i stupid in thinking this.... but sometimes a car needs a good thrash as it were to clear it out of some crap :eek::)
Click to expand...

lol indeed but not every long journey that i do.. i do like to drive sensible some of the time

T14086 said:
Ask for copy of printout, it's politness to leave a copy in your service book/glovebox etc for your reference.

(clocks not reset)
Click to expand...

yeh i will do this time. thanks for your help.
 
This sounds exactly the same as the problems I'm getting in my 1.6.

It's the DPF regenerating which shouldn't cause misfires but obviously does.

My dealer basically said "it's faulty and we can't fix it".
 
brickdog said:
If this is a DPF regeneration that hasn't completed is there any general advice for what to do when I get this which will ensure the regeneration completes successfully?
Click to expand...

In a word , No. You should carry on driving it rather than stop , but in my experience that makes no difference.

The DPF has two types of regeneration.
The first is passive , where the exhaust gases heat the filter enough to start burning the soot. This won't happen around town but should occur when the car is driven at motorway speeds for a decent distance - pretty much all manufacturers tell you to do this from time to time to help clear the filter.
The other type is active regeneration where the ECU delivers more fuel to the engine than normal to heat the filter and it's when this happens that the car is misfiring. You should be able to tell that it's doing this as it will have a bit less power , but it should not cause the car to run so badly that it won't do 50mph!

For the first 4000 miles the passive regeneration worked as it should in my car , but since then it's required active regeneration far too frequently - every 100 miles or less!

It seems obvious to me that the DPF isn't working correctly even with the active regeneration as it shouldn't clog up that soon afterwards. It seems to me that changing the DPF would be a good place to start , but my dealer just says "It's probably a software problem and we need to wait for Fiat to fix it" which to me is completely unacceptable. I don't care what the actual fault is - the end result is that my car is undriveable for 10 miles every 100 and my fuel economy has gone to ****.
 
Dr Zoidberg said:
In a word , No. You should carry on driving it rather than stop , but in my experience that makes no difference.

The DPF has two types of regeneration.
The first is passive , where the exhaust gases heat the filter enough to start burning the soot. This won't happen around town but should occur when the car is driven at motorway speeds for a decent distance - pretty much all manufacturers tell you to do this from time to time to help clear the filter.
The other type is active regeneration where the ECU delivers more fuel to the engine than normal to heat the filter and it's when this happens that the car is misfiring. You should be able to tell that it's doing this as it will have a bit less power , but it should not cause the car to run so badly that it won't do 50mph!

For the first 4000 miles the passive regeneration worked as it should in my car , but since then it's required active regeneration far too frequently - every 100 miles or less!

It seems obvious to me that the DPF isn't working correctly even with the active regeneration as it shouldn't clog up that soon afterwards. It seems to me that changing the DPF would be a good place to start , but my dealer just says "It's probably a software problem and we need to wait for Fiat to fix it" which to me is completely unacceptable. I don't care what the actual fault is - the end result is that my car is undriveable for 10 miles every 100 and my fuel economy has gone to ****.
Click to expand...


yup.. i think me and you have the same problem...and i bet my dealer is aware of it but keep telling me that there is no fault...i cant book it in yet as im on days and i wont be able to get the car down there but when im back on nights next week i will be pointing them towards this..

my fuel eco has also gone rubbish.. it knocks about 5mpg off my Average MPG when it does it. It then takes the engine another 20miles or so to start fueling correctly again so that my MPG goes back normal...

Must be something we can do.. someone we can talk to about it at fiat! ?
 
craig20102010 said:
yup.. i think me and you have the same problem...and i bet my dealer is aware of it but keep telling me that there is no fault...i cant book it in yet as im on days and i wont be able to get the car down there but when im back on nights next week i will be pointing them towards this..

my fuel eco has also gone rubbish.. it knocks about 5mpg off my Average MPG when it does it. It then takes the engine another 20miles or so to start fueling correctly again so that my MPG goes back normal...

Must be something we can do.. someone we can talk to about it at fiat! ?
Click to expand...

I spoke to Fiat today and they agree that it's a fault and admit that they don't have a fix available.

They reckon that the dealers haven't been correctly escalating it through Fiat UK and on to Fiat italy.

Can I ask anyone who's suffering from this problem to put pressure on their dealers to speak to Fiat as it's definitely affecting plenty of cars.

The woman I spoke to in customer services is called Sue so she should be aware and can link all the cases together.
 
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