JTD jerky moves - constant acceleration - Alfa Romeo Forum
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JTD jerky moves - constant acceleration

Hello,

For some time I face a persistent and nagging problem: my car goes jerky / interrupted.

The "show" starts just after the engine started to warm up(after 2 minutes of driving). . The range that feels badly is around 2200 rpm, and under 2000rpm. I repeat, ONLY if i maintain constant throttle or accelerate very very smooth.If i accelerate, disappear, but reappears if i keep again constant.

No lose of power.


I made several tests and replacement of parts with no effects :
- I cleaned and blocked EGR-> no change (EGR functional so I left, I removed the lock plate) - in FiatEcuScan shows that it's working
- MAF, just stands in the tester parameters, no symptoms of a dead sensor
- MAP - cleaned / replaced with a Facet new one, but no change, so i put back the old Bosch.
- I replaced the crankshaft sensor with a genuine BOSCH
- Changed the fuel filter
- I have no hose broken
- i shift over 2500rpm after the engine warmed
- no lights on dash



Any ideas or opinions are welcome, I have no idea what to check anymore.


Car: 1.9 JTD 8v 2003
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I have similar symptoms with my 1.9JTDm.......
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THE problem lies in the interrupt on of signal of your EGR valve, shut it off mechanicaly and with software and you will have no more problems anymore.

Tim
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