blue smoke very uneven lumpy vibration

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   Hi.to you all.my 2008 t5 1.9 pd low ps one since owning has never wanted to pull below 2000 rpm.and drifted black smoke without power below 2000 and pulling ok after 2000.now the bad bit.i have just had a stage 1 remap installed and it pulled really well but i noticed at the low rpm it was still not pulling.next day my wife went out and eml light came on blue smoke running rough vibration woudnt rev properly.just started looking.i have took off n75 connection and maf connection neither made any difference.your thoughts please.

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174 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 01 Sep 09 Status: Offline Points: 105	Post Options Post Reply Quote 174 Report Post Thanks(0) Quote Reply Topic: blue smoke very uneven lumpy vibration Posted: 26 Oct 21 at 09:53
	Hi.to you all.my 2008 t5 1.9 pd low ps one since owning has never wanted to pull below 2000 rpm.and drifted black smoke without power below 2000 and pulling ok after 2000.now the bad bit.i have just had a stage 1 remap installed and it pulled really well but i noticed at the low rpm it was still not pulling.next day my wife went out and eml light came on blue smoke running rough vibration woudnt rev properly.just started looking.i have took off n75 connection and maf connection neither made any difference.your thoughts please.

gregozedobe Members Profile Send Private Message Find Members Posts Add to Buddy List Vanorak Joined: 22 Dec 06 Location: Canberra, Oz Status: Offline Points: -998266	Post Options Post Reply Quote gregozedobe Report Post Thanks(1) Quote Reply Posted: 26 Oct 21 at 10:28
	Black smoke is unburnt diesel (too much fuel/not enough air). Possibly the turbo wasn't making enough boost at low revs. Variable vanes stuck in the high speed position maybe ? Blue smoke is usually oil, often from a fail/ing/ed turbo. Check for excessive play on the turbo shaft.

T5 TDI Members Profile Send Private Message Find Members Posts Add to Buddy List Vanorak Joined: 05 Nov 05 Status: Offline Points: 3687	Post Options Post Reply Quote T5 TDI Report Post Thanks(1) Quote Reply Posted: 27 Oct 21 at 20:29
	You really need to get a scan with VCDS or similar as a basic start. Expect to see codes for the wires you pulled off! Blue smoke is a bit more worrying than black smoke but start with the scan. Vibrations on diesels often turn out to be misfires often caused by injector problems but a split intercooler can cause similar symptoms. Remappers shouldn't be remapping engines with obvious other faults. Simple things you can check yourself start with the air filter and pipework for restrictions and the intercooler for any swelling, missing or loose vertical braces or oil staining. Any splits in the big hoses from the turbo to the intercooler also can cause power loss and black smoke. Neither I.9's or 2.5's have much boost below 2000 rpm but there shouldn't be much black or blue smoke or 'shaking'.
	2004 2.5 174