Alfa 156 JTS missing power - Alfa Romeo Forum
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2005156 2.0 JTS

Alfa 156 JTS missing power

Hi have a 2005 (late facelift - registered April 2005) 156 with 2.0 JTS engine, with 97000 miles. Compared to my previous early 156 TS, it has never been as free revving. Now I know all the stories about the shortcomings of the JTS, the different character, the coking of inlet valves - but mine is a late one, with the altered gearing and cam timing that was supposed to prevent the coking problem. Does it really?
Anyway, problem is this - the car pulls really well low down - way better than the TS. But it never has that 3000+ rpm shift when the TS had its power kick in - in fact it's hard (and a bit pointless) to get it to rev over 5000 - it is just flat.
I have plugged FiatEcuScan in and had a look around. No fault codes. From the Actuators section I can make the VVT solenoid click (and tried switching to a known good one off my TS). Have tried swapping the MAF sensor, and spark plugs. Absolutely no difference. With the engine running, FES shows zero ignition advance - I have seen that reported elsewhere - but could that be a factor, or is it just a bug in the software?
I also tried driving with FES running. Floored it at 2000rpm - somewhere around 3000 the VVC flag went to ON - but returned to OFF shortly after - not sure when but certainly well before 4000 (with no obvious change in engine performance). Is this normal - or could this be a clue to the problem? Any other suggestions, please?
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No problem with my 109,000 GTV, made July 2004. Alfa Tuner recommends regular use of an injector cleaner for the direct injection JTS engine, personally I use BG44K about every 20,000 miles, it does make a difference. I had new injectors fitted at about 70,000 miles that gave a very noticeable improvement, but they are difficult to get at & cost about £100 each. The JTS engine is also known for having carbon build up in the exhaust piping, I had a large bore free-flow cat-back exhaust fitted at about 65,000 miles, there was a very noticeable improvement in the willingness to pull higher revs, the old exhaust was very heavy due to the carbon build up.
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