GTA V6 - Idle Misfire + Monitor Control Sys. Failure After T.Belt Change
Took my immaculate, perfect-running 29,000 mile 147 GTA in for a timing belt change on Monday. Its a 2004 so was overdue a belt on a time-based interval.
Belt, tensioner, pulleys changed - even got the correct cam lockers from EB Spares for the mechanic to use. Also new plugs fitted.
Got the call "your car's ready", and when I got there it was parked ticking over. As soon as I opened the door I heard it grumbling and misfiring like a pig. Tailpipes were jumping back and forth, engine jiggling violently on its mounts. Also, 'monitor control system failure' was up on the dash pod. Plugging it in revealed 'random multiple misfire' cylinders 1/3/5 (or 1,2,3 - it was all one bank anyway)
Long story short, I left and politely asked them not to phone until it was as perfect as it was when I left it.
A day later and they said the timing was out half a tooth causing the poor idle, and it was ready to collect.
Although now much better, the idle was much rougher than it was prior to the car being worked on, on the the test drive it felt down on power (and the exhaust stunk of catalytic converter).
Sensing I was getting nowhere, I paid up and said I would take it to an Alfa specialist to which they eventually agreed to subsidise.
By the time I'd got home in the car, monitor control system failure was back, the idle was still rough and was still slightly down on grunt.
The car has been at the specialist today (I will keep them anonymous for the time being - they are doing everything they can to sort it), and they confirmed the timing to be bang on, and said they wouid proceed to do a compression test, as all the coil packs and wiring seemed to be in order.
So I'm sure you can appreciate how well and truly gutted I am that my baby has been unnecessarily buggered up, for the sake of a non-critical t.belt change (the belt that came off was in as good a condition as the new one)
Any help/suggestions as to the culprit will be very much appreciated