Yet another EGR related question...
I've been lurking this forum since buying my Alfa 156 SW last year and love the power vs economy of the 2.4 JTD 20v engine but it is getting to be a right PITA lately!!
The car has only done 45k miles but recently became more and more smokey. Add to this, 'kangarooing' when maintaining a lower speed (40mph).
A month or so back I removed the EGR valve and cleaned as it was caked in soot but nothing was seized up. Also changed the air filter, diesel filter and "looked" at the MAF sensor. Overall black smoke seemed lass but it was still erratic on light throttle.
Last week, I checked the MAP sensor and found it was very sooty so cleaned off with a soft brush. I also bought a little blanking plate for the EGR (one with a small central hole to effectively restrict the exhaust gas flow) and fitted - the results were brilliant! The performance was back, no jerkiness, hardly any black smoke...
But I also got an engine warning light - doh!
It came on whilst sat at traffic lights with the engine ticking over.
I got hold of an ECU cable and it was reporting "Air Quantity 2" and something to do with very low air reading.
The car has gone in for an MOT this morning and so last night I removed the EGR blanking plate and reset the error - hopefully the error light will not return during the MOT!
Anyway, if you've read this far... the hole in the blanking plate is supposed to prevent any error light so is the issue elsewhere?
Also, as soon as I drove it to the MOT station this morning, the jerkiness was back with a vengeance!
So is this the EGR faulty or MAF or something else?
(BTW - VNT vacuum hoses and turbo pipes checked and all seem A1)
I see so many threads on here where owners have bought and replaced countless parts at great expense only to find the problem is still there.
Thanks in advance for any help.