Hello legends I have a 2012 thai d40 manual. Had it since new. It's running rough like it has a lumpy cam when starting in the morning. Blows a fair bit of black exhaust fumes at idle and under load. In the last year I have had a brand new head, timing chain, scv, clutch and last week I had 4 brand new Injectors fitted and programmed and it still has these symptoms. The car has done 270,000 km and has also had the egr blocked since 17,000km. Any help would be greatly appreciated
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- Thread starter Skotie
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I wonder if the intercooler is a little blocked up. It can't be the turbo, that's not used at idle. Cleaning the MAFS can't hurt (do not use anything other than electrical contact cleaner or MAFS cleaner on it). MAFS is in the back of the air intake just outside the air filter box.
Yeah that's all been done yesterday. Had the scan tool all over it reprogramming injectors and the ecu just to make sure. Even changed out the scv. I'm thinking possible hole in the piston. I have a diesel specialist to contact today too see what he thinks also.
I don't think a holed piston would cause a lot of black smoke - certainly a rough idle. With a holed piston you'd see some dilution of the sump oil with diesel (gradual) because that cylinder won't fire (needs compression). A compression test (both "dry" and "wet" ) would show this really fast.
Yeh that's getting done today. Hoping the it's positive news.
I cleaned the maf with appreciate cleaner last week end and it surprised me the amount of black smoke that it cut out
I dropped it off at a diesel specialist that got highly recommended by 3 people hopefully I can get an answer this week. It drove like a gem once warmed up it was about a 40 minute drive. When/if I get an answer I'll post it up. The maf was cleaned and fuel filter bypassed, ecu resets and fuel pressure was checked. The specialist has a more in depth check to do too it so hopefully something comes up.
Well I have an answer I just need to get it into the shop again. The specialist said that the head that I purchased and had installed is a Chinese head and they have seen it many times before that the valves tighten up and need to be shimmed and the material they use to make the heads is crap. So I'll get them shimmed and see how it goes.
Getting a new head installed. Should pick it up this week. The problem head chewed a cam lobe on cyc 3 so no valves were seating. Also 1 intake valve on the rest of the cylinders were also not seating. Pretty good for 15k km since install. The supplier of the new head is also doing a report on that crappy head that failed. So I'll take that back to the supplier of that. Also getting a new rad and water pump so everything besides the turbo and bottom end will be new. Can't wait too have it back after all this.
