Alfa 159 Ti 2.4 JTD noisy tappets / valves - Alfa Romeo Forum
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(Post Link) post #1 of 27 Old 11-04-12 Thread Starter
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Alfa 159 Ti 2.4 JTD noisy tappets / valves

I've recently purchased a new 159 Ti 2.4 diesel, but am not entirely happy with the tappet / valve noise coming from the engine. Put aside the normal diesel sounds, this is a definite ticking noise from one side of the engine, when the engine is under load, and more pronounced when above 3000 RPM. It has only done 2000 miles, and has been back to the dealer twice with my concern. The dealer describes it as normal, but I've had many diesel vehicles, and none make this ticking noise (it has a metallic sound). I also feel that 26 MPG (around town) is low for a diesel.

I would appreciate anyones comments as to what they thought this may be.
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i get this ticking noise on mine also...i believe it to be one of the injectors, think the culprit on mine is number 5. cant be sure hopefully someone will be along in a bit to confirm if theyve had a similar problem..

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My 1.9 sounds tappety when cold, not sure if it's meant to as its the first diesel I've owned... I've ran bg244 through it and it's still there so not convinced its the injectors. Maybe the same, as mine is more pronounced when at higher revs, but it's not there everytime I start her up....
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I think its just the normal diesel noises. Thats why people pay so much to run V6's
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I had this noise on my 1.9 and was told by several sources that it was the injectors. Very irritating noise that reminded me of an old Ford Escort.
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(Post Link) post #6 of 27 Old 11-04-12 Thread Starter
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Thank you all for your comments so far. I want to believe it is something simple like "injector noise", but when the ticking noise occurs (under load and generally at 3000+ revs) it has a very metallic sound. Is it possible for an injector to produce this sound ?

A mechanic mentioned to me last week that the noise had to do with the anti-pollution system on the engine. Sounds a bit far fetched. As you mentioned MikeX159, it sounds like an old Ford Escort or Anglia with a bad tappet / vale problem. It would be comforting to find a definitive answer.
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Bare in mind it's a 5 pot engine as well, so it's got 1 cylinder out of sync with the other 4 making it sound odd anyway
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(Post Link) post #8 of 27 Old 12-04-12 Thread Starter
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Yeah - I like the uneven sound. Pity about the metallic tappet / valve noise.

I drove it all day today with the music turned up so loud, I couldn't hear any engine noise.

As I read through other posts in this forum, it seems I am not alone with this noise. It's a pity someone (an engineer / mechanic) from Alfa Romeo doesn't frequent and offer their expert answer.
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Get a video of the noise

I've wondered about a couple of rattles on mine before but put it down to just being the 5 pot diesel engine
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If this is an anti pollution thing would Any one with a egr turned off by remap care to comment on their engine sound.
You Should also have a look at the correction values on the injectors with fes or similer.
If you search the forum for injectors more info is available
 
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When I had a brand new 1.9 ti I had a a tappety/clicking noise like this and it turned out to be the fuel pump. It also made a vague grumbling sound from time to time also. My current 2.4ti makes none of these noises - just the usual " I'm shaking a bucket of gravel " when cold......
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The fuel pump and injectors can be very noisy on modern diesels, they run at ridiculous pressures and can definitely make a metallic sound as they're mechanical parts opening and closing.
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Not to scare you but my 2.4 was quite tappety too. Having stripped mine down due to a failed oil pump, I found that on one of the cam rockers that the centre pin had come most of the way out. This had let all the needle bearings fall out but not the outter race, this outer race is the bit the cam runs on. This in turn would rattle around and make quite a loud tappety noise.
Should have everything back together over the weekend, so will let you know if the tappety noise has gone.
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My 2.4 does it as well. Never had any issues with it though.
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If the noise is constant (regardless of load) then it's more likely to be tappets or some other mechanical problem. If it varies by load (i.e. louder when accelerator is pressed) it's injectors. A tank full of premium grade diesel and/or injector cleaner (BG244 gets a good write-up elsewhere on the forum) *might* help, especially on such a new car.
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Quote:
Originally Posted by dastocks View Post
If the noise is constant (regardless of load) then it's more likely to be tappets or some other mechanical problem. If it varies by load (i.e. louder when accelerator is pressed) it's injectors. A tank full of premium grade diesel and/or injector cleaner (BG244 gets a good write-up elsewhere on the forum) *might* help, especially on such a new car.
If the revs rise the cam spins quicker, half the speed of the crank, the tappet noise will increase in relation to the speed of the engine as would the speed of the injetors. Are they not really directly linked.
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Quote:
Originally Posted by coxy1 View Post
If the revs rise the cam spins quicker, half the speed of the crank, the tappet noise will increase in relation to the speed of the engine as would the speed of the injetors. Are they not really directly linked.
I'm talking about intensity, not frequency.

On my car when the car is on the over-run (no accelerator) no fuel is injected = no noise. I only get the clatter under acceleration / load.
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Ahh, see where your coming from.
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Quote:
Originally Posted by dastocks View Post
I'm talking about intensity, not frequency.

On my car when the car is on the over-run (no accelerator) no fuel is injected = no noise. I only get the clatter under acceleration / load.
Good thinking... Mine only makes a noise when cold, when she's warm she purrs until I put my foot down an then the typical diesel noise comes out....
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Metallic tapping noises could be down to one or more broken rockers as someone suggested further up the thread. It would also give terrible fuel economy, as one or more valves will not be opening properly.
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i would say that the noise is coming from the injectors ;do not remove the injectors .have the injectors recoded on the injectors there is a very long code ;this code has to be reprogrammed onto the injectors with help of a dianostic machine.each injector is factory coded so every injector has its own code linked to the ecu .the coding process would take approx 20 mints if taken to a guy that knows what im talking about i hope this works for u guys.
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Originally Posted by casmico View Post
i would say that the noise is coming from the injectors ;do not remove the injectors .have the injectors recoded on the injectors there is a very long code ;this code has to be reprogrammed onto the injectors with help of a dianostic machine.each injector is factory coded so every injector has its own code linked to the ecu .the coding process would take approx 20 mints if taken to a guy that knows what im talking about i hope this works for u guys.
As long as each injector goes back from the cylinder which you took it from, it does not need re coding, just a new copper sealing washer. Each injector is coded to each cylinder and the ecu so it knows which to fire at the right time.
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i have recently downloded a free copy of the fiatecuscan software ,im using a vagcom 409 interface and when i try to connect it gives me message ecu not responding 'any ideas what can be the problem.what is the best interface to use with full version registed software.many thanks
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Hello all. Sorry to revive this old thread but I might have the same issue with 2.4 159. I hear this rattling / tappeting sound when I accelerate past 2000 rpm. Please check this video (I've recorded the noise): https://www.youtube.com/watch?v=pd_D2nTJD6k
What do you think?
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Jesus... it sounds like an old train! To much echo.
Can you make another video over engine bay and be more specific?
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