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Discussion Starter #1
In the last 2 to 3 months, so from about 20K miles, my 1997 159 2.4 210bhp has developed a sort of misfire especially under light throttle settings at around 2000 revs. It can happen in any gear from 3rd in traffic right through to 6th on the motorway, infact it even did it on cruise control the other day and I had to intervene with a slight throttle input to stop it. It is intermittent in that I cannot recreate it on demand but it seems more likely to occur under load like a slight incline. I get no warning or error lights coming up when the 'misfire' happens. As I post this I am in France having covered 1600 miles in the last week with much of that on almost empty autoroutes so it has certainly had a good run but the problem persists. I'm planning to talk to my dealer when I get back to UK and threads on here suggest EGR valves or fuel filters may be a starting point. Has anyone else had these symptoms and found the cause and even better a fix?
 

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My 2.4 seems to do exactly the same; intermittently. Giving it a good blast up to the red line does seem to clear it though. Is seems with my car that the engine gets coked up if it's been run gently, at low revs for a while.
 

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Thats the one! We all have it...mine is worse than ever but keep putting off contacting the garage...must do so today.

When the DPF is recycling its gets REALLY bad and can sometimes stall.
 

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Guess what....just heard from the garage...no problem with my car apparently. A car that stutters between 1k and 3 k in any gear has an issue!!! During DPF regen a couple of weeks ago it sat in drive shaking and banging under idle with the choke losing its battle to keep the engine running.

I'll add it to the list of "non problems" along with my front tyres lasting only 4K.

:(
 

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Discussion Starter #9
Driving up through France I put a tankful of Total's Excellium diesel in and lo and behold the symptoms seem to have all but vanished over 350 or so miles. I'm not sure if there is still sometimes a faint miss on pickup or if it's just me but it's a lot better than it has been. There aren't many Total garages near home but I guess BP's Ultimate must be similar so I will try that and see if the improvement is maintained.
 

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A lot of people on here with 2.4's swear by BP Ultimate or V-Power, but I had the occasional misfire under load, on my car and have cured it by using Millers diesel additive - and I still run it on supermarket diesel.
 

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Brera misfire

hi, just had my 2.4 brera put in the garage for a diagnostic cos i was having exactly the same problems (violent vibes when in any gear 3rd or above with slight depression of the throttle).
at first they came back with "no fault found, may just be running a little rough" so i told them to go out again cos it was certainly more than that.

anyways, got a call next day and the mechanic agrees, and said there was a "techs to see" where this fault had been highlighted but requires a further 5 hrs of labour to confirm (which i have to pay for) and at the end may not even be covered by waranty. said the issue was prob. injectors, fuel hoses etc.

so, anyone else got any advice or experience before i take the plunge?
 

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159 2.4 jtdm misfire

Hi.

I have recently suffered the misfire problem with my '06 159 2.4 jtdm. I got hunting at idle, misfiring shortly after setting off, and bad misfiring on motorways (sometimes limited to 60mph). As usual, the diagnostics came up with nothing. I had the egr valve replaced, and over a period of about 5 weeks the problem gradually went away. I believe the problem is down to coking of the cylinder head, which is triggered by a faulty egr valve constantly feeding sooty exhaust gases back into the engine. The other posts seem to prove this out with the use of diesel additives / 'premium' grades of diesel. I would strongly suggest firstly using an additive / couple of tanks of BP ultimate (or equiv). If you see an improvement with this cheap fix, consider getting the egr valve replaced (~£150 from independent garage) and drop back onto normal diesel (I usually use Total for the record). Hope this helps.
 

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Sorry for my poor english.Problem may be in a throttle Valve inlет manifold.In Bulgariа we have a lot of problems with them, because our diesel fuel nice.My 1.9 JTDm have a problem with EGR at 1800 rpm,and i must remove the software.:thumbs::thumbs::thumbs::thumbs:
 

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Got it solved under warranty, didnt have to pay for the investigation either in the end. Alfa admit to it being a common fault, and so they changed the injectors and i think the fuel hoses too. that was a month ago, running loads better and mpg is better by 8 mpg as a plus.

but from now on ill be using additives and better diesel to avoid a repeat
 

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I use Millers

In my Brera 2.4 JTD I had a misfire / stutter running rough around 1500-2000 revs, any gear, hot or cold, rain or shine.

After searching the forums I tried Millers Diesel additive.

After a tankful of fuel mixed with a measure of Millers, the problem cured.

Went back to fuel only without Millers, problem came back.

Put Millers back in with next tank of fuel, problem gone.

I use this with every fill up now, keeps me smiling.

Also Just had a month ago a remap from AHM in Hampshire from 210 to 250 BHP. The difference is great. Smooth extra power no flat spots, better consumption. On a run @ 70mph I regularly get 41-43 mpg. Round town 35-39. Which is much better than before the remap. The power is available much earlier in the rev range, making a much more relaxed drive if you want and not changing gear so much if you don't fancy it. Top end is improved, acceleration is fantastic, about 0-60 in 6.4 sec. Midrange is a wonderful improvement.

I would urge anyone to do the remap on a 2.4 JTD. I only recommend AHM in Hartley Wintney, Hampshire.

Cheers

Stu
 

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In my Brera 2.4 JTD I had a misfire / stutter running rough around 1500-2000 revs, any gear, hot or cold, rain or shine.

After searching the forums I tried Millers Diesel additive.

After a tankful of fuel mixed with a measure of Millers, the problem cured.

Went back to fuel only without Millers, problem came back.

Put Millers back in with next tank of fuel, problem gone.

I use this with every fill up now, keeps me smiling.

Also Just had a month ago a remap from AHM in Hampshire from 210 to 250 BHP. The difference is great. Smooth extra power no flat spots, better consumption. On a run @ 70mph I regularly get 41-43 mpg. Round town 35-39. Which is much better than before the remap. The power is available much earlier in the rev range, making a much more relaxed drive if you want and not changing gear so much if you don't fancy it. Top end is improved, acceleration is fantastic, about 0-60 in 6.4 sec. Midrange is a wonderful improvement.

I would urge anyone to do the remap on a 2.4 JTD. I only recommend AHM in Hartley Wintney, Hampshire.

Cheers

Stu
+ 1

Also had my DPF Removed and EGR disabled (AHM) - this was about 5k ago and had not a single issue since - prior to remap and DPF removal - I had all the above.
 

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Hi Stu

Well done in removing the DPF and EGR - in my opinion these emission-meeting devices are both 'non-green' (reduction in mpg) and bad for the engine (excessive sooting / strain on injectors). Obviously, you must now be getting some smoke out of the exhaust, especially under load. Is it very noticable, and does it affect the MOT? If you're able to provide a ball park cost for the work (DPF, EGR and remap), that would be very helpful as I'm interested in doing the same. Cheers - Phil.
 

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Remap Cost / DPF Removal

Hi Phil

Remap is £300, DPF removal is £300, EGR is disabled with either.

I only recommend one place - AHM in Hampshire. It was a trek for me but they are brilliant there, their expertise is fantastic.

I would never recommend anything like a tuning box or generic remap. Every car is so different and unique it pays to have a proper specialist sort it.

here is the site AHM-Alfa Romeo Specialist-Servicing & Repairs-JTD Diesel Remaps & Q2 Limited Slip Diff Conversions

Good luck, keep us posted on progress

cheers

Stu
 

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cause for Juddering/Misfiring found

In the last 2 to 3 months, so from about 20K miles, my 1997 159 2.4 210bhp has developed a sort of misfire especially under light throttle settings at around 2000 revs. It can happen in any gear from 3rd in traffic right through to 6th on the motorway, infact it even did it on cruise control the other day and I had to intervene with a slight throttle input to stop it. It is intermittent in that I cannot recreate it on demand but it seems more likely to occur under load like a slight incline. I get no warning or error lights coming up when the 'misfire' happens. As I post this I am in France having covered 1600 miles in the last week with much of that on almost empty autoroutes so it has certainly had a good run but the problem persists. I'm planning to talk to my dealer when I get back to UK and threads on here suggest EGR valves or fuel filters may be a starting point. Has anyone else had these symptoms and found the cause and even better a fix?
Hi...I know this is an old thread, but I find them extremely useful and thought I would add to it. I too had exactly the same Juddering/Misfiring symptoms and followed various threads pointing towards the EGR valve (of which I changed several times with no success). I eventually found a thread that recommended disconnecting the MAF sensor, which I did, and the juddering/misfiring disapeared....now I know I need to get a new MAF valve ;)
 
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