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Discussion Starter · #1 ·
Even when my car is on the motorway, under acceleration, it sounds like a tractor. I'm used to this noise when the engine is cold, but not when it's been warmed up. Additionally, when starting the car first thing, it vibrates heavily, sounds like it's just firing on a few cylinders. I understand that with this freezing weather, the oil will be a bit thicker, but I'm still reasonably certain it shouldn't shake like it does. Any suggestions?
 

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Get it on multiscan and check the injector correction values,and also if any fault codes logged.
Sounds like it could have a dodgy injector to me.
 

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Even when my car is on the motorway, under acceleration, it sounds like a tractor. I'm used to this noise when the engine is cold, but not when it's been warmed up. Additionally, when starting the car first thing, it vibrates heavily, sounds like it's just firing on a few cylinders. I understand that with this freezing weather, the oil will be a bit thicker, but I'm still reasonably certain it shouldn't shake like it does. Any suggestions?
I have the 2.4 and it’s nothing like that?
Even cold it doesn’t sound too bad but nice and throaty in the cabin when motoring - Lussoman will always tell you that they are tractors and should have the ‘Red tractor’ kite mark on them!
I would do the usual (unless they have already been seen to) EGR, Swirl flaps, MAP sensor cleaning - Has she been remapped and the EGR blanked off?
Another point, they tend to enjoy the colder weather due to the air temp so run better in my experience?
 

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Discussion Starter · #4 ·
I have the 2.4 and it’s nothing like that?
Even cold it doesn’t sound too bad but nice and throaty in the cabin when motoring - Lussoman will always tell you that they are tractors and should have the ‘Red tractor’ kite mark on them!
I would do the usual (unless they have already been seen to) EGR, Swirl flaps, MAP sensor cleaning - Has she been remapped and the EGR blanked off?
Another point, they tend to enjoy the colder weather due to the air temp so run better in my experience?
Hi Topic, yes, all the above attention has been given to the engine. I'm taking it to my trusted 'Indy' this afternoon along with a sound recording I thoughtfully made this morning on my mobile. Maybe the combination of that and the Garages' knowledge can shed some light on it.
 

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Lussoman will always tell you that they are tractors and should have the ‘Red tractor’ kite mark on them!
:thumbs: Good point Topic!

I'm presuming this thread is tongue-in cheek, or the OP is new to diesel ownership?
 

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Discussion Starter · #6 ·
Lusso, I'm familiar with Diesel engine noises, having had 2 VW Siroccos, an Audi A4 and now, 2 159's, all diesel. My worry is why it's suddenly become much more pronounced, and the vibrating, that's new.
My Indie garage can't see it until next week as I'll be away, but thankfully not driving it every day. I'll take it easy on the motorway to and from the airport this week I think.
 

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Even when my car is on the motorway, under acceleration, it sounds like a tractor. I'm used to this noise when the engine is cold, but not when it's been warmed up. Additionally, when starting the car first thing, it vibrates heavily, sounds like it's just firing on a few cylinders. I understand that with this freezing weather, the oil will be a bit thicker, but I'm still reasonably certain it shouldn't shake like it does. Any suggestions?
I remember test driving a GT 1.9 JTDM once and remember thinking it sounded noisier the 2.0 and 2.4 JTDM - certainly pulled well though
 

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Hi Topic, yes, all the above attention has been given to the engine. I'm taking it to my trusted 'Indy' this afternoon along with a sound recording I thoughtfully made this morning on my mobile. Maybe the combination of that and the Garages' knowledge can shed some light on it.
How did it go at the mechanics?
 

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Even when my car is on the motorway, under acceleration, it sounds like a tractor. I'm used to this noise when the engine is cold, but not when it's been warmed up. Additionally, when starting the car first thing, it vibrates heavily, sounds like it's just firing on a few cylinders. I understand that with this freezing weather, the oil will be a bit thicker, but I'm still reasonably certain it shouldn't shake like it does. Any suggestions?
I am interested in the conclusion of this story. I have a 2.0 JTDM (170 BHP) from 2009 and also sometimes (especially when it is cold) the engine makes more revs (between 1000 and 1250 RPM > it just passed a tiny bit the 1000 mark) on idle than normal (it just doesnt reach the 1000 mark. About 800 RPM) according to the RPM odometer. After a 10/15 minutes drive, the idle RPM then drops again to 'normal'. I first owned a 1.8 MPI of 2008 and this never occured back then...:scratchchin:

I recall something about someone saying that the idle status of the engine is being determined also by outside temperature....
 

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Mine does not do it....no matter how cold. Always around 750 rpm idle....hot or cold. Something you need to look into I think. Downloaded any fault codes??
 

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Discussion Starter · #13 ·
Mine does not do it....no matter how cold. Always around 750 rpm idle....hot or cold. Something you need to look into I think. Downloaded any fault codes??
No, nothing downloaded. I've got most of next week off, so hopefully I can get the whole mystery cleared during that time.
 

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Discussion Starter · #14 ·
I am interested in the conclusion of this story. I have a 2.0 JTDM (170 BHP) from 2009 and also sometimes (especially when it is cold) the engine makes more revs (between 1000 and 1250 RPM > it just passed a tiny bit the 1000 mark) on idle than normal (it just doesnt reach the 1000 mark. About 800 RPM) according to the RPM odometer. After a 10/15 minutes drive, the idle RPM then drops again to 'normal'. I first owned a 1.8 MPI of 2008 and this never occured back then...:scratchchin:

I recall something about someone saying that the idle status of the engine is being determined also by outside temperature....
OK, I've had it to both my 'Indie' garage and the Alfa specialist who removed the swirl flaps a few weeks ago. The Indie garage confirmed that there was definitely a problem with the engine noise and vibration, but advised me to take it back to the specialist which I did this morning. Plugging the scan unit in to see if any error codes came up proved that nothing was at fault. So, the dilemma continued, timing was correct, no hoses loose or any oil leaks either. Eventually, he disconnected the Airflow meter on the upper side of the Turbo inlet pipe. Now, it sounds a lot quieter, but I'm not 100% convinced. Tomorrow morning when I start it from cold should be an indication.
With a faulty or inoperative air flow meter, the wrong info would've been being sent to the fuel system apparently.
 

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If unplugging your MAF helps then you need a new MAF sensor regardless of whether that is the only problem.

Check the MAP sensor too as it may benefit from a clean
 
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Discussion Starter · #16 ·
If unplugging your MAF helps then you need a new MAF sensor regardless of whether that is the only problem.

Check the MAP sensor too as it may benefit from a clean
Thanks Larry. That wasn't mentioned, but I'll suggest it when I call back tomorrow.
 

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Discussion Starter · #18 ·
How's your car going now? Problem solved?
Hi Francie. No, it's worse. I ended up re connecting the airflow meter as it became evident that there was no real difference. Friday morning, on starting, it nearly stalled, and the noise!! After a second or two of hesitation it 'caught' and all was good. Driving to the airport though on the M40, it felt slightly rough the whole way. It still has plenty of pickup and remains no slouch, but this continual starting problem and vibration is starting to really bug me. I'll be back in the country tomorrow morning, so with the car having sat for 4 days, it'll be interesting to see how it performs.
Maybe one or two of the injectors could be faulty.
 

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Hi Francie. No, it's worse. I ended up re connecting the airflow meter as it became evident that there was no real difference. Friday morning, on starting, it nearly stalled, and the noise!! After a second or two of hesitation it 'caught' and all was good. Driving to the airport though on the M40, it felt slightly rough the whole way. It still has plenty of pickup and remains no slouch, but this continual starting problem and vibration is starting to really bug me. I'll be back in the country tomorrow morning, so with the car having sat for 4 days, it'll be interesting to see how it performs.
Maybe one or two of the injectors could be faulty.
I'm having similar problems, though mine starts fine. I've replaced all injectors, tappets, clutch and flywheel, removed swirl flaps. I'm booking mine in as I don't know how and what to fix to solve the problem.
 
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