2.4jtd bad starting and lumpy idle - Alfa Romeo Forum
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(Post Link) post #1 of 6 Old 05-08-09 Thread Starter
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Help 2.4jtd bad starting and lumpy idle

Hi All,

Just purchased my second Alfa and my first ever diesel all at the same time. I hope I havenít got a lemon! If anybody can help with the below it would be very much appreciated. I have searched the forums but couldnítí find anyone with similar symptoms.

When starting (worse when the engine is warm) it takes a couple of turns of the starter motor before the engine catches. When it does catch it chugs into life with a lot a judder. The engine then idles badly. With some throttle the idle evens out and it drives fine (if throttle is released then the bad idle returns).

I had it serviced by an Alfa main dealer and they advised glow plugs. However, my local independent (non Alfa specialist) doesnít subscribe to this. They argue that when warm the glow plugs would not make any difference (which I tend to agree with) and the glow plug warning light does not come on. They suspect a potential faulty injector. They are also reluctant to change the glow plugs if they are not needed due to the risk of them snapping, which they advise is fairly common for Alfaís.

Is this a common fault by any chance? Is the risk of the plugs snapping high?

Any suggestions welcomed and appreciated.

P.S. Any Alfa specialists near south west Essex?

aashwell is offline  
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i agree with the independant... you have an injector that's not up to par...

tell you what you can do to identify the culprit:

stop the engine, unplug the electric connection on the first injector, if it starts and runs the same you found the bad one... if it doesn't, or runs worse, stop the engine again, plug it back in and go to the next one....

4 cyl diesels don't run on 2 cilinders, the 2.4 might just run on 3.... still, it should be obvious which is the bad one...

don't unplug the injectors while the engine is running! this could damage the ECU, and in case Piezo-injectors are used, can kill the engine!!
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(Post Link) post #3 of 6 Old 05-08-09 Thread Starter
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Brilliant, thank you, very helpful. I'll give it a go and let you know how I got on
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(Post Link) post #4 of 6 Old 10-08-09 Thread Starter
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O.k. not good news. I gave it back to the independent and they checked the injectors (spell kit??) and run a diagnostic. No faults were found. The mechanic then checked inside of the oil filer cap. The oil had just been changed and is nice and clean at the bottom of the engine but at the top around the filer cap there were some sort of filings. He suspects something is breaking down inside the engine, possibly the cam shafts, but won’t know for sure until he strips it for a closer look.

His boss pulled the plug and stated they wanted nothing more to do with it. The mechanic said he’d do the job privately. Not too keen on this as I imagine specialist tools will be needed.

Questions, does this all sound plausible? I’m guessing I’m looking at mega money, well in excess of £500, I would have expected the Alfa main dealer who just serviced the car and changed the cam belt to have picked this up.
Any one got any thoughts or suggestions??
aashwell is offline  
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Dont understand why a garage wont take on the possible repair, it is only an engine prob...you can take cam cover off to see if cam's are damaged as he suggest's..
Unless you got a good mate to have a look for you..

sr-performance is offline  
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156 sportwagon

Recently bought a 51 plate 2.4 jtd sportswagon with 127,000 on the clock, off a workmate.
he had a lot of trouble with hot starting and rough idle, finally found that it was a failed 'o' ring seal on an injector bleeding off the pressure in the fuel rail,
a few pence for the kit but £80 for the diagnostic and fitting !!

HOWARDD425 is offline  

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24jtd , bad , idle , lumpy , starting

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