R50/53 Boost leak from fuel injector
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1st Gear
Joined: Oct 2020
Posts: 26
Likes: 9
Boost leak from fuel injector
Hi All, i have a 15lb pulley on my 03 MCS. Over time I noticed that the car has lost power so I did standard maintenance (new sparkplugs, coilpack, tensioner, engine mounts, bpv, etc) and it still felt pretty much the same. I logged a max boost 12 psi via OBD. I nfally did a smoke test via the TMAP senor (I did block off the air intake and noticed smoke coming from the number 2 injector. Has anoyone seen this before? I ordered new injector o rings.
2nd Gear
Joined: May 2025
Posts: 109
Likes: 48
From: Florida
Did you order genuine MINI/BMW o-rings? I'm not sure if it's true, but I've heard there can be (small) size discrepancies with aftermarket injector o-rings.
Not to hijack the thread, but is the TMAP or MAP sensor where everyone is putting smoke into the system while testing? Or is there a more preferable location?
Not to hijack the thread, but is the TMAP or MAP sensor where everyone is putting smoke into the system while testing? Or is there a more preferable location?
Did you order genuine MINI/BMW o-rings? I'm not sure if it's true, but I've heard there can be (small) size discrepancies with aftermarket injector o-rings.
Not to hijack the thread, but is the TMAP or MAP sensor where everyone is putting smoke into the system while testing? Or is there a more preferable location?
Not to hijack the thread, but is the TMAP or MAP sensor where everyone is putting smoke into the system while testing? Or is there a more preferable location?
Right or wrong I've always done a smoke test from the PCV, detaching/blocking off the air inlet.
Last edited by Here2Go; Nov 13, 2025 at 01:22 PM. Reason: mrinjector.us
Thread Starter
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1st Gear
Joined: Oct 2020
Posts: 26
Likes: 9
Did you order genuine MINI/BMW o-rings? I'm not sure if it's true, but I've heard there can be (small) size discrepancies with aftermarket injector o-rings.
Not to hijack the thread, but is the TMAP or MAP sensor where everyone is putting smoke into the system while testing? Or is there a more preferable location?
Not to hijack the thread, but is the TMAP or MAP sensor where everyone is putting smoke into the system while testing? Or is there a more preferable location?
Thread Starter
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1st Gear
Joined: Oct 2020
Posts: 26
Likes: 9
I'll try this too next time I test. Thanks!
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