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Blue smoke from engine

 
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RVA  



Joined: 21 Jan 2023
Posts: 43
Location: Netherlands

PostPosted: Wed Mar 26, 2025 5:40 am    Post subject: Blue smoke from engine Reply with quote

This past weekend i started my car for the first time after doing an efi conversion with an ecumaster ecu. It ran pretty well but still needs some tuning on a dyno.

However, there is quite a lot of blue smoke coming from the exhaust, to the point where its to much to even really start driving it. The smoke is there when idling, and when i push the throttle, even more smoke appears.

What do i do to find out where its coming from? I already verified that its not coming from the crankcase breather, so i am guessing its either piston rings, engine block or valve seals. Maybe headgasket leaking oil internally??

I did a compression test about a year ago, with 10,5 bar on all cilinders.

So far the engine has ran for about 20 minutes, and the smoke is still there, i am kind of hoping there is just a lot of dirt/oil in the exaust and it will clear up a bit with some more idling and maybe some driving. But if it does not clear up, whats my next step to see what causes the smoke?
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peterld  



Joined: 10 Dec 2006
Posts: 981
Location: Noosa Heads QLD Australia

PostPosted: Wed Mar 26, 2025 9:07 pm    Post subject: Reply with quote

Compression test, then if relatively similar, a leak down test which will determine the next step.
Obviously firstly check that all pipes/hoses are connected where they should be and you haven't introduced an issue with your EFI conversion.
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