i have just had my cossie rebuilt about 750 miles ago, and had it rolling roaded on wednesday. it has 803,s ahmed chip, dark greens and -31 actuator etc, and now when you rev it hard under load or decelerate in gear after giving iot a bit of boost, it seems to throw a bit of white smoke out the back. not loads, but it looks like a smokey old sierra and i am a bit worried. please shed some light n the situation for me. (everything was brand new on the engine and on the upgrade, and it was rolling roaded by a cossie speciaist)

 

Sounds like its turbo rebuild time are you running a t3 or t34

 

t34... brand new

 

i had similar probs last year and was traced back to faulty map sensor,does it smoke on over run?mine did.

 

i have exactly the same on mine at the moment but my mates following me said its black/brown so it sounds like its over fuelling big time.Its going in to engine advantages on monday 13th so hopefully they'll be able to sort it for me.

 

Mine does it at first when i boot it, but thats just fuel, but the blue smoke when decelerating could be valve stem oil seals, or piston rings, but if youv just rebuilt it im sure its new rings anyway, did you do your seals or guide`s?

 

same problem ,up till now i have been told ,,,Turbo ,valve stem oil seals ,rings and over fueling .
I hope its the latter as the turbo is not that old with very litle play,compresion is good ruleing out rings and although i have a set of valve seals i will get the car set up anyhow first to see if this helps ,.
Basicly a case of elimination

 

I have just taken my block in for machining, the car used oil but run great and compression was ok and even, but when block checked has 0.008" wear in the bores, so at least i have found my problem, so don't presume all ok if it passes compression test. Although this is not the case with a newly built engine, but 750 miles seems a short milage maybe not all bedded in yet.

Darren