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(Post Link) post #1 of 10 Old 07-04-15 Thread Starter
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JTS Engines - Confused

Basically - I'm shopping - I keep coming across 'bargain' 2.2 JTS engined cars.
However my trusty Alfa specialist tells me to avoid at all costs as it's a 'badly designed' engine and will be full of woes such as blocked-injectors, cat-problems and hence NCT (MOT) emission failures etc. ...

...but, as I understand the original 2.0 JTS (Fiat based) is a completely different engine than the later 2.2 JTS (GM based?).

Is my mechanic thinking of the 2.0 or 2.2 JTS or are they both a source of constant sorrow ??

Cheers in advance for any help - before I get completely confused and leave the Alfa fold.
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I'd check with your specialist as to whether he's talking about the 2L JTS.

I think there are some issues with the 2.2 - although it was a long-awaited chaindriven-cam engine (previous Alfas suffered from early cambelt failures), I believe the chain can be a source of problems.
 
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Maybe do a forum search on '2.2 chain'?

Also, have a look in the 159, Brera & 946 Spider section, the 2.2 engine is fitted in all those models.
 
(Post Link) post #4 of 10 Old 08-04-15 Thread Starter
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Cheers - I've read a lot of posts on the regular 'known' issues with the 2.2 JTS i.e. chain stretch etc.. however I wondered if all the other issues re- wiring looms, cat failures, sensor failures, clogging up of injectors was specific to the earlier 2.0 fiat block JTSs or all of them including the later GM based 2.2 JTS.
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Sensor failings and fauled coils, sparks and maybe injectors was the the bane of the JTS engine.
When topping up, the oil would run outside the engine and into the spark plug hole.
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The early JTS engines suffered with carbon build up in the inlet tract.

On a regular indirect injection engine the fuel is sprayed in there which washes the oil from the crankcase breather into the combustion chamber. On a direct injection engine of course the fuel is sprayed directly into the cylinder so there is nothing to wash the inlet clean of oil and it carbonises due to the heat.

Not sure if the 2.2's suffer from this? Maybe they have modified the breather system.
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Quote:
Originally Posted by cannotstop View Post
Sensor failings and fauled coils, sparks and maybe injectors was the the bane of the JTS engine.
When topping up, the oil would run outside the engine and into the spark plug hole.
The problem with oil running into the spark plug holes was exactly the same with the Twin Spark engine, no difference whatsoever.

Quote:
Originally Posted by symon View Post
The early JTS engines suffered with carbon build up in the inlet tract.

On a regular indirect injection engine the fuel is sprayed in there which washes the oil from the crankcase breather into the combustion chamber. On a direct injection engine of course the fuel is sprayed directly into the cylinder so there is nothing to wash the inlet clean of oil and it carbonises due to the heat.
An old post of mine: https://www.alfaowner.com/Forum/10468681-post2.html

Quote:
Not sure if the 2.2's suffer from this? Maybe they have modified the breather system.
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I'm driving a 2.2 JTS and I don't have any problems. But I'm doing the regular service (oil etc.) that doesn't require special tooling myself. Even the chain change isn't that difficult (not done on mine). I'm suggesting it's a problem with the water pump (seized bearing) and or clogged oil nozzles spraying the chain. I use oil flush every oil change and change cooling fluid regularly (cooling fluid lubricates the pump). I took it apart and it is absolutely normal like any other modern built engine. 185 italian ponies are fun to drive
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I have a 2.2 jts engine on my 159 and it gets shell helix ultra 5w40 and oil filter changes every 5000 km. I am particular about the quality of fuel she gets and so far I have been replacing the coolant every 2 years. I am very happy with the car and although I had heard and researched the stretched chain proble, the low rev hesitation issue and the water pump troubles that some ppl have had, I am glad I went ahead and bought one. Almost 100k on the clock by now and still going strong.

With proper maintenance and a min commute of 20- 25 min each way so the oil gets to temp I think it is a solid choice.
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Spider 2005 jts

2.2 JTS is Opel based
2.0TS is Fiat/Alfa, possible problem with cars before 2004 afterwords they had other pistons and rings, problems where solved
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