Member
My e46 throws smoke when I downshift ! Like white or blue ish and sometimes black on acceleration! Seems to be running good! Have eBay headers and straight pipe with post cat sensor off
Wagon meister :)
BMW Tech Expert
Welcome to the forum!
Well Bluish color smoke would be oil burning, white can be coolant, and black is unburnt fuel. The fact that you have zero exhaust can play in as there is nothing to absorb it, but typically it will be the CCV going bad.
Darin
Current:
16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
Past:
95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
82 528i euro Saphire Blue Met/Blue Leather RIP
79 525 euro Green/Green RIP
79 318 Silver/Black - The first one that got it all started
M-Flight Member
Are you done yet?
+1 likely CCV, but also since you're running catless it's likely nothing if it's a small amount of smoke. Is there any more oil consumption than normal and is there a lot of smoke?
Last edited by garf; 06-08-2017 at 05:13 PM.
Member
A failing head gasket will give white smoke. Run your finger around your tailpipe, the antifreeze will be sort of slimy. Do a compression test to check your ring wear - smoke under acceleration is rings. Smoke after it's been idling awhile and you step on the gas is the valve guides. CCV's are easy - so it doesn't hurt to start there. CCV's also cause other pressure related problems like a leaking valve cover gasket.
Member
Thanks for all the ideas ! And it's not that much smoke it only does it when I downshift and it smells like oilOriginally Posted by dworthy
Wagon meister :)
BMW Tech Expert
Yes, start with the CCV (Crank Case Ventilation), that is probably what they are talking about.
Darin
Current:
16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
Past:
95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
82 528i euro Saphire Blue Met/Blue Leather RIP
79 525 euro Green/Green RIP
79 318 Silver/Black - The first one that got it all started
M-Flight Member
Member
" bluefish white smoke"....LOL and YES...a Striped Bass will have a more black-white hue......well put!
Last edited by Eaglesail; 06-10-2017 at 04:26 PM.
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