Poor idle update
Just saw that there was some follow up queries to this old thread.
I did eventually get this car sorted in July of last year after a lot of hassle.
It was one bad injector (non repairable) and 1 injector needing overhauled.
So alfa mechanic was talking rubbish. DMF etc wasn't an issue.
Having spoken to another owner with an identical problem, he had same symptom, same poor diagnosis, and eventually same fault - injectors.
If its a bad idle it will almost certainly be injector related. No amount of injector cleaner will make any difference. EGR cleaning etc won't make much difference. I had looked at pretty much everything else and certainly wasted time and money.
After replacing 1 injector and overhauling the other one, the car ran better than it ever has. Great power improvement, no vibration, no interior mirror shaking all over the place.
A good result or so I thought..........
2 months later harsh clicking noise at idle then lots of bad noises as I shut off as fast as possible.
I was going to buy something newer but now had to buy quickly. Got a very nice 2011 159 Sportwagon.
147 was parked up for repair.
Just getting round to doing it now.
It lost 1 swirl valve - plastic manifold with metal swirl flaps. Swirl valve jammed between inlet valve and valve guide. Result - 1 bent valve plus some debris floating about. No damage to piston/rings/bore.
Have fitted 4 new valves to that chamber. New alloy manifold with swirl valves removed. New belts, idlers etc all waiting to go on.
Hopefully it will be fine........................It could have been much worse.
Anyway, with regards to the poor idling my advice would be get your injectors checked by a good diagnostic specialist who knows what theyre doing. Pay the money for somebody good - you will save in the long run.
I think it cost me £75ish for the diagnostics and had an answer very quickly.
Injectors were a nightmare to get out (upside of that was they were easier to get out for removing the head this time)
Hopefully this story of good and bad will help somebody...........................