As some of you may know, I have a new project car to fix. It's a 54 plate 156SW 1.9jtd mjet.
It also has an alfatune 175bhp remap. I mention this only for info, not because I think it's got anything to do with the problems I'm about to describe.
It's recently had problems with its injectors, no 1 failed wide open, causing the car to grind to a halt. Testing ALL of the injectors showed this to be the problem (2,3 & 4 were OK) and the worst was assumed initially, that the engine would be scrap.
However an injector was cobbled together by a specialist and fitted, the engine ran, albeit badly. It felt like it has a misfire lacked power and smoked. A lot.
It was a this point, the owner gave up, bought a Brera and sold it to me.
I bought it expecting to find that it has a bent con rod but I've fitted another replacement injector supplied by the seller that is assumed to be good. It now runs like it should, ish.
It feels like it has it's full compliment of ponies but it has a slight misfire which can be heard at the exhaust pipe but isn't noticeable otherwise.
I also still smokes, a lot, when revved hard. Black smoke.
No fault codes are logged.
I disconnected the MAF, which made no difference to the way it ran, so we swapped that for an unknown replacement. No Change. Same for the MAP sensor. But then I don't know if the replacements are any good.
The injector on 1, the one I replaced needs a new seal, combustion gases are leaking past it, which may explain the slight misfire.
It clatters, more so than I would expect, occasionally after being left to idle then revved hard.
That was tonight but after that, we gave up. It was dark, 2.0deg c and raining...
Code the replacement injector in to the ecu and make sure the other 3 are coded right.
Check the EGR valve?
Fuel pressure values.
And maybe a leakage test for the injectors.
Other suggestions are welcome!!!